Merge pull request #1908 from umbraco/temp-scope-events-stale-entities

POC to normalize all event entities when we track events so that all …

src/Umbraco.Core/Events/CancellableObjectEventArgs.cs

@@ -1,85 +1,177 @@
 using System;
+using System.Collections;
 using System.Collections.Generic;
+using System.Linq;
 using System.Security.Permissions;
 using Umbraco.Core.Models;
 using Umbraco.Core.Models.EntityBase;
 
 namespace Umbraco.Core.Events
 {
-	/// <summary>
+    /// <summary>
-	/// Event args for a strongly typed object that can support cancellation
+    /// Used as a base class for the generic type CancellableObjectEventArgs{T} so that we can get direct 'object' access to the underlying EventObject
-	/// </summary>
+    /// </summary>
-	/// <typeparam name="T"></typeparam>
+    [HostProtection(SecurityAction.LinkDemand, SharedState = true)]
-	[HostProtection(SecurityAction.LinkDemand, SharedState = true)]
+    public abstract class CancellableObjectEventArgs : CancellableEventArgs
-	public class CancellableObjectEventArgs<T> : CancellableEventArgs, IEquatable<CancellableObjectEventArgs<T>>
+    {
-	{
+        protected CancellableObjectEventArgs(object eventObject, bool canCancel, EventMessages messages, IDictionary<string, object> additionalData)
-	    public CancellableObjectEventArgs(T eventObject, bool canCancel, EventMessages messages, IDictionary<string, object> additionalData)
             : base(canCancel, messages, additionalData)
-	    {
+        {
             EventObject = eventObject;
         }
 
-	    public CancellableObjectEventArgs(T eventObject, bool canCancel, EventMessages eventMessages)
+        protected CancellableObjectEventArgs(object eventObject, bool canCancel, EventMessages eventMessages)
             : base(canCancel, eventMessages)
         {
             EventObject = eventObject;
         }
 
-        public CancellableObjectEventArgs(T eventObject, EventMessages eventMessages)
+        protected CancellableObjectEventArgs(object eventObject, EventMessages eventMessages)
             : this(eventObject, true, eventMessages)
         {
         }
 
+        protected CancellableObjectEventArgs(object eventObject, bool canCancel)
+            : base(canCancel)
+        {
+            EventObject = eventObject;
+        }
+
+        protected CancellableObjectEventArgs(object eventObject)
+            : this(eventObject, true)
+        {
+        }
+
+        /// <summary>
+        /// Returns the object relating to the event
+        /// </summary>
+        /// <remarks>
+        /// This is protected so that inheritors can expose it with their own name
+        /// </remarks>
+        internal object EventObject { get; set; }
+
+    }
+
+    /// <summary>
+    /// Event args for a strongly typed object that can support cancellation
+    /// </summary>
+    /// <typeparam name="T"></typeparam>
+    [HostProtection(SecurityAction.LinkDemand, SharedState = true)]
+    public class CancellableObjectEventArgs<T> : CancellableObjectEventArgs, IEquatable<CancellableObjectEventArgs<T>>
+    {
+        public CancellableObjectEventArgs(T eventObject, bool canCancel, EventMessages messages, IDictionary<string, object> additionalData)
+            : base(eventObject, canCancel, messages, additionalData)
+        {
+        }
+
+        public CancellableObjectEventArgs(T eventObject, bool canCancel, EventMessages eventMessages)
+            : base(eventObject, canCancel, eventMessages)
+        {
+        }
+
+        public CancellableObjectEventArgs(T eventObject, EventMessages eventMessages)
+            : base(eventObject, eventMessages)
+        {
+        }
+
         public CancellableObjectEventArgs(T eventObject, bool canCancel)
-			: base(canCancel)
+            : base(eventObject, canCancel)
-		{
+        {
-			EventObject = eventObject;
+        }
-		}
 
-		public CancellableObjectEventArgs(T eventObject)
+        public CancellableObjectEventArgs(T eventObject)
-			: this(eventObject, true)
+            : base(eventObject)
-		{
+        {
-		}
+        }
 
-		/// <summary>
+        /// <summary>
-		/// Returns the object relating to the event
+        /// Returns the object relating to the event
-		/// </summary>
+        /// </summary>
-		/// <remarks>
+        /// <remarks>
-		/// This is protected so that inheritors can expose it with their own name
+        /// This is protected so that inheritors can expose it with their own name
-		/// </remarks>
+        /// </remarks>
-		protected T EventObject { get; set; }
+        protected new T EventObject
+        {
+            get { return (T) base.EventObject; }
+            set { base.EventObject = value; }
+        }
 
-	    public bool Equals(CancellableObjectEventArgs<T> other)
+        public bool Equals(CancellableObjectEventArgs<T> other)
-	    {
+        {
-	        if (ReferenceEquals(null, other)) return false;
+            if (ReferenceEquals(null, other)) return false;
-	        if (ReferenceEquals(this, other)) return true;
+            if (ReferenceEquals(this, other)) return true;
-	        return base.Equals(other) && EqualityComparer<T>.Default.Equals(EventObject, other.EventObject);
+            return base.Equals(other) && EqualityComparer<T>.Default.Equals(EventObject, other.EventObject);
-	    }
+        }
 
-	    public override bool Equals(object obj)
+        public override bool Equals(object obj)
-	    {
+        {
-	        if (ReferenceEquals(null, obj)) return false;
+            if (ReferenceEquals(null, obj)) return false;
-	        if (ReferenceEquals(this, obj)) return true;
+            if (ReferenceEquals(this, obj)) return true;
-	        if (obj.GetType() != this.GetType()) return false;
+            if (obj.GetType() != this.GetType()) return false;
-	        return Equals((CancellableObjectEventArgs<T>) obj);
+            return Equals((CancellableObjectEventArgs<T>)obj);
-	    }
+        }
 
-	    public override int GetHashCode()
+        public override int GetHashCode()
-	    {
+        {
-	        unchecked
+            unchecked
-	        {
+            {
-	            return (base.GetHashCode() * 397) ^ EqualityComparer<T>.Default.GetHashCode(EventObject);
+                return (base.GetHashCode() * 397) ^ EqualityComparer<T>.Default.GetHashCode(EventObject);
-	        }
+            }
-	    }
+        }
 
-	    public static bool operator ==(CancellableObjectEventArgs<T> left, CancellableObjectEventArgs<T> right)
+        public static bool operator ==(CancellableObjectEventArgs<T> left, CancellableObjectEventArgs<T> right)
-	    {
+        {
-	        return Equals(left, right);
+            return Equals(left, right);
-	    }
+        }
 
-	    public static bool operator !=(CancellableObjectEventArgs<T> left, CancellableObjectEventArgs<T> right)
+        public static bool operator !=(CancellableObjectEventArgs<T> left, CancellableObjectEventArgs<T> right)
-	    {
+        {
-	        return !Equals(left, right);
+            return !Equals(left, right);
-	    }
+        }
-	}
+    }
+
+    [HostProtection(SecurityAction.LinkDemand, SharedState = true)]
+    public class CancellableEnumerableObjectEventArgs<T> : CancellableObjectEventArgs<IEnumerable<T>>, IEquatable<CancellableEnumerableObjectEventArgs<T>>
+    {
+        public CancellableEnumerableObjectEventArgs(IEnumerable<T> eventObject, bool canCancel, EventMessages messages, IDictionary<string, object> additionalData)
+            : base(eventObject, canCancel, messages, additionalData)
+        { }
+
+        public CancellableEnumerableObjectEventArgs(IEnumerable<T> eventObject, bool canCancel, EventMessages eventMessages)
+            : base(eventObject, canCancel, eventMessages)
+        { }
+
+        public CancellableEnumerableObjectEventArgs(IEnumerable<T> eventObject, EventMessages eventMessages)
+            : base(eventObject, eventMessages)
+        { }
+
+        public CancellableEnumerableObjectEventArgs(IEnumerable<T> eventObject, bool canCancel)
+            : base(eventObject, canCancel)
+        { }
+
+        public CancellableEnumerableObjectEventArgs(IEnumerable<T> eventObject)
+            : base(eventObject)
+        { }
+
+        public bool Equals(CancellableEnumerableObjectEventArgs<T> other)
+        {
+            if (ReferenceEquals(null, other)) return false;
+            if (ReferenceEquals(this, other)) return true;
+
+            return EventObject.SequenceEqual(other.EventObject);
+        }
+
+        public override bool Equals(object obj)
+        {
+            if (ReferenceEquals(null, obj)) return false;
+            if (ReferenceEquals(this, obj)) return true;
+            if (obj.GetType() != this.GetType()) return false;
+            return Equals((CancellableEnumerableObjectEventArgs<T>)obj);
+        }
+
+        public override int GetHashCode()
+        {
+            return HashCodeHelper.GetHashCode(EventObject);
+        }
+    }
 }

src/Umbraco.Core/Events/DeleteEventArgs.cs

@@ -1,9 +1,14 @@
 using System;
 using System.Collections.Generic;
+using System.Linq;
 
 namespace Umbraco.Core.Events
 {
-    public class DeleteEventArgs<TEntity> : CancellableObjectEventArgs<IEnumerable<TEntity>>, IEquatable<DeleteEventArgs<TEntity>>, IDeletingMediaFilesEventArgs
+    [SupersedeEvent(typeof(SaveEventArgs<>))]
+    [SupersedeEvent(typeof(PublishEventArgs<>))]
+    [SupersedeEvent(typeof(MoveEventArgs<>))]
+    [SupersedeEvent(typeof(CopyEventArgs<>))]
+    public class DeleteEventArgs<TEntity> : CancellableEnumerableObjectEventArgs<TEntity>, IEquatable<DeleteEventArgs<TEntity>>, IDeletingMediaFilesEventArgs
 	{
 	    /// <summary>
 	    /// Constructor accepting multiple entities that are used in the delete operation
@@ -106,7 +111,7 @@ namespace Umbraco.Core.Events
 	    {
 	        if (ReferenceEquals(null, other)) return false;
 	        if (ReferenceEquals(this, other)) return true;
-	        return base.Equals(other) && MediaFilesToDelete.Equals(other.MediaFilesToDelete);
+	        return base.Equals(other) && MediaFilesToDelete.SequenceEqual(other.MediaFilesToDelete);
 	    }
 
 	    public override bool Equals(object obj)

src/Umbraco.Core/Events/ImportEventArgs.cs

@@ -4,7 +4,7 @@ using System.Xml.Linq;
 
 namespace Umbraco.Core.Events
 {
-    public class ImportEventArgs<TEntity> : CancellableObjectEventArgs<IEnumerable<TEntity>>, IEquatable<ImportEventArgs<TEntity>>
+    public class ImportEventArgs<TEntity> : CancellableEnumerableObjectEventArgs<TEntity>, IEquatable<ImportEventArgs<TEntity>>
     {
         /// <summary>
         /// Constructor accepting an XElement with the xml being imported

src/Umbraco.Core/Events/ImportPackageEventArgs.cs

@@ -4,7 +4,7 @@ using Umbraco.Core.Packaging.Models;
 
 namespace Umbraco.Core.Events
 {
-    internal class ImportPackageEventArgs<TEntity> : CancellableObjectEventArgs<IEnumerable<TEntity>>, IEquatable<ImportPackageEventArgs<TEntity>>
+    internal class ImportPackageEventArgs<TEntity> : CancellableEnumerableObjectEventArgs<TEntity>, IEquatable<ImportPackageEventArgs<TEntity>>
     {
         private readonly MetaData _packageMetaData;
 
@@ -32,7 +32,8 @@ namespace Umbraco.Core.Events
         public bool Equals(ImportPackageEventArgs<TEntity> other)
         {
             if (ReferenceEquals(null, other)) return false;
-            if (ReferenceEquals(this, other)) return true;
+            if (ReferenceEquals(this, other)) return true;
+            //TODO: MetaData for package metadata has no equality operators :/
             return base.Equals(other) && _packageMetaData.Equals(other._packageMetaData);
         }
 

src/Umbraco.Core/Events/PublishEventArgs.cs

@@ -3,7 +3,7 @@ using System.Collections.Generic;
 
 namespace Umbraco.Core.Events
 {
-    public class PublishEventArgs<TEntity> : CancellableObjectEventArgs<IEnumerable<TEntity>>, IEquatable<PublishEventArgs<TEntity>>
+    public class PublishEventArgs<TEntity> : CancellableEnumerableObjectEventArgs<TEntity>, IEquatable<PublishEventArgs<TEntity>>
     {
         /// <summary>
         /// Constructor accepting multiple entities that are used in the publish operation

src/Umbraco.Core/Events/SaveEventArgs.cs

@@ -1,8 +1,9 @@
 using System.Collections.Generic;
+using System.Linq;
 
 namespace Umbraco.Core.Events
 {
-	public class SaveEventArgs<TEntity> : CancellableObjectEventArgs<IEnumerable<TEntity>>
+	public class SaveEventArgs<TEntity> : CancellableEnumerableObjectEventArgs<TEntity>
 	{
         /// <summary>
         /// Constructor accepting multiple entities that are used in the saving operation
@@ -116,7 +117,5 @@ namespace Umbraco.Core.Events
 		{
 			get { return EventObject; }
 		}
-
-
 	}
 }

src/Umbraco.Core/Events/ScopeEventDispatcherBase.cs

@@ -1,6 +1,8 @@
 using System;
+using System.Collections;
 using System.Collections.Generic;
 using System.Linq;
+using Umbraco.Core.Models.EntityBase;
 
 namespace Umbraco.Core.Events
 {
@@ -15,6 +17,7 @@ namespace Umbraco.Core.Events
     /// </remarks>
     public abstract class ScopeEventDispatcherBase : IEventDispatcher
     {
+        //events will be enlisted in the order they are raised
         private List<IEventDefinition> _events;
         private readonly bool _raiseCancelable;
 
@@ -73,29 +76,263 @@ namespace Umbraco.Core.Events
         {
             if (_events == null)
                 return Enumerable.Empty<IEventDefinition>();
-
+            
             switch (filter)
             {
                 case EventDefinitionFilter.All:
-                    return _events;
+                    return FilterSupersededAndUpdateToLatestEntity(_events);
                 case EventDefinitionFilter.FirstIn:
                     var l1 = new OrderedHashSet<IEventDefinition>();
                     foreach (var e in _events)
                     {
                         l1.Add(e);
                     }
-                    return l1;
+                    return FilterSupersededAndUpdateToLatestEntity(l1);
                 case EventDefinitionFilter.LastIn:
                     var l2 = new OrderedHashSet<IEventDefinition>(keepOldest: false);
                     foreach (var e in _events)
                     {
                         l2.Add(e);
                     }
-                    return l2;
+                    return FilterSupersededAndUpdateToLatestEntity(l2);
                 default:
                     throw new ArgumentOutOfRangeException("filter", filter, null);
             }
         }
+        
+        private class EventDefinitionTypeData
+        {
+            public IEventDefinition EventDefinition { get; set; }
+            public Type EventArgType { get; set; }
+            public SupersedeEventAttribute[] SupersedeAttributes { get; set; }
+        }
+        
+        /// <summary>
+        /// This will iterate over the events (latest first) and filter out any events or entities in event args that are included 
+        /// in more recent events that Supersede previous ones. For example, If an Entity has been Saved and then Deleted, we don't want
+        /// to raise the Saved event (well actually we just don't want to include it in the args for that saved event)
+        /// </summary>
+        /// <param name="events"></param>
+        /// <returns></returns>
+        private static IEnumerable<IEventDefinition> FilterSupersededAndUpdateToLatestEntity(IReadOnlyList<IEventDefinition> events)
+        {
+            //used to keep the 'latest' entity and associated event definition data
+            var allEntities = new List<Tuple<IEntity, EventDefinitionTypeData>>();
+
+            //tracks all CancellableObjectEventArgs instances in the events which is the only type of args we can work with
+            var cancelableArgs = new List<CancellableObjectEventArgs>();
+
+            var result = new List<IEventDefinition>();
+
+            //This will eagerly load all of the event arg types and their attributes so we don't have to continuously look this data up
+            var allArgTypesWithAttributes = events.Select(x => x.Args.GetType())
+                .Distinct()
+                .ToDictionary(x => x, x => x.GetCustomAttributes<SupersedeEventAttribute>(false).ToArray());
+               
+            //Iterate all events and collect the actual entities in them and relates them to their corresponding EventDefinitionTypeData
+            //we'll process the list in reverse because events are added in the order they are raised and we want to filter out
+            //any entities from event args that are not longer relevant 
+            //(i.e. if an item is Deleted after it's Saved, we won't include the item in the Saved args)
+            for (var index = events.Count - 1; index >= 0; index--)
+            {
+                var eventDefinition = events[index];
+
+                var argType = eventDefinition.Args.GetType();
+                var attributes = allArgTypesWithAttributes[eventDefinition.Args.GetType()];
+
+                var meta = new EventDefinitionTypeData
+                {
+                    EventDefinition = eventDefinition,
+                    EventArgType = argType,
+                    SupersedeAttributes = attributes
+                };
+
+                var args = eventDefinition.Args as CancellableObjectEventArgs;
+                if (args != null)
+                {
+                    var list = TypeHelper.CreateGenericEnumerableFromObject(args.EventObject);
+
+                    if (list == null)
+                    {
+                        //extract the event object
+                        var obj = args.EventObject as IEntity;
+                        if (obj != null)
+                        {
+                            //Now check if this entity already exists in other event args that supersede this current event arg type
+                            if (IsFiltered(obj, meta, allEntities) == false)
+                            {
+                                //if it's not filtered we can adde these args to the response
+                                cancelableArgs.Add(args);
+                                result.Add(eventDefinition);
+                                //track the entity
+                                allEntities.Add(Tuple.Create(obj, meta));
+                            }
+                        }
+                        else
+                        {
+                            //Can't retrieve the entity so cant' filter or inspect, just add to the output
+                            result.Add(eventDefinition);                            
+                        }
+                    }
+                    else
+                    {
+                        var toRemove = new List<IEntity>();
+                        foreach (var entity in list)
+                        {
+                            //extract the event object
+                            var obj = entity as IEntity;
+                            if (obj != null)
+                            {
+                                //Now check if this entity already exists in other event args that supersede this current event arg type
+                                if (IsFiltered(obj, meta, allEntities))
+                                {
+                                    //track it to be removed
+                                    toRemove.Add(obj);
+                                }
+                                else
+                                {
+                                    //track the entity, it's not filtered
+                                    allEntities.Add(Tuple.Create(obj, meta));
+                                }
+                            }
+                            else
+                            {
+                                //we don't need to do anything here, we can't cast to IEntity so we cannot filter, so it will just remain in the list
+                            }
+                        }
+
+                        //remove anything that has been filtered
+                        foreach (var entity in toRemove)
+                        {
+                            list.Remove(entity);
+                        }
+
+                        //track the event and include in the response if there's still entities remaining in the list
+                        if (list.Count > 0)
+                        {
+                            if (toRemove.Count > 0)
+                            {
+                                //re-assign if the items have changed
+                                args.EventObject = list;
+                            }
+                            cancelableArgs.Add(args);
+                            result.Add(eventDefinition);
+                        }
+                    }
+                }
+                else
+                {
+                    //it's not a cancelable event arg so we just include it in the result
+                    result.Add(eventDefinition);
+                }
+            }
+
+            //Now we'll deal with ensuring that only the latest(non stale) entities are used throughout all event args
+            UpdateToLatestEntities(allEntities, cancelableArgs);
+
+            //we need to reverse the result since we've been adding by latest added events first!
+            result.Reverse();
+
+            return result;
+        }
+
+        private static void UpdateToLatestEntities(IEnumerable<Tuple<IEntity, EventDefinitionTypeData>> allEntities, IEnumerable<CancellableObjectEventArgs> cancelableArgs)
+        {
+            //Now we'll deal with ensuring that only the latest(non stale) entities are used throughout all event args
+
+            var latestEntities = new OrderedHashSet<IEntity>(keepOldest: true);
+            foreach (var entity in allEntities.OrderByDescending(entity => entity.Item1.UpdateDate))
+            {
+                latestEntities.Add(entity.Item1);
+            }
+
+            foreach (var args in cancelableArgs)
+            {
+                var list = TypeHelper.CreateGenericEnumerableFromObject(args.EventObject);
+                if (list == null)
+                {
+                    //try to find the args entity in the latest entity - based on the equality operators, this will 
+                    //match by Id since that is the default equality checker for IEntity. If one is found, than it is 
+                    //the most recent entity instance so update the args with that instance so we don't emit a stale instance.
+                    var foundEntity = latestEntities.FirstOrDefault(x => Equals(x, args.EventObject));
+                    if (foundEntity != null)
+                    {
+                        args.EventObject = foundEntity;
+                    }
+                }
+                else
+                {
+                    var updated = false;
+
+                    for (int i = 0; i < list.Count; i++)
+                    {
+                        //try to find the args entity in the latest entity - based on the equality operators, this will 
+                        //match by Id since that is the default equality checker for IEntity. If one is found, than it is 
+                        //the most recent entity instance so update the args with that instance so we don't emit a stale instance.
+                        var foundEntity = latestEntities.FirstOrDefault(x => Equals(x, list[i]));
+                        if (foundEntity != null)
+                        {
+                            list[i] = foundEntity;
+                            updated = true;
+                        }
+                    }
+
+                    if (updated)
+                    {
+                        args.EventObject = list;
+                    }
+                }
+            }
+        }
+
+        /// <summary>
+        /// This will check against all of the processed entity/events (allEntities) to see if this entity already exists in 
+        /// event args that supersede the event args being passed in and if so returns true.
+        /// </summary>
+        /// <param name="entity"></param>
+        /// <param name="eventDef"></param>
+        /// <param name="allEntities"></param>
+        /// <returns></returns>
+        private static bool IsFiltered(
+            IEntity entity,
+            EventDefinitionTypeData eventDef,
+            List<Tuple<IEntity, EventDefinitionTypeData>> allEntities)
+        {
+            var argType = eventDef.EventDefinition.Args.GetType();
+
+            //check if the entity is found in any processed event data that could possible supersede this one
+            var foundByEntity = allEntities
+                .Where(x => x.Item2.SupersedeAttributes.Length > 0
+                            //if it's the same arg type than it cannot supersede                
+                            && x.Item2.EventArgType != argType
+                            && Equals(x.Item1, entity))
+                .ToArray();
+
+            //no args have been processed with this entity so it should not be filtered
+            if (foundByEntity.Length == 0)
+                return false;
+
+            if (argType.IsGenericType)
+            {
+                var supercededBy = foundByEntity
+                    .FirstOrDefault(x =>
+                        x.Item2.SupersedeAttributes.Any(y =>
+                            //if the attribute type is a generic type def then compare with the generic type def of the event arg
+                                (y.SupersededEventArgsType.IsGenericTypeDefinition && y.SupersededEventArgsType == argType.GetGenericTypeDefinition())
+                                //if the attribute type is not a generic type def then compare with the normal type of the event arg
+                                || (y.SupersededEventArgsType.IsGenericTypeDefinition == false && y.SupersededEventArgsType == argType)));
+                return supercededBy != null;
+            }
+            else
+            {
+                var supercededBy = foundByEntity
+                    .FirstOrDefault(x =>
+                        x.Item2.SupersedeAttributes.Any(y =>
+                            //since the event arg type is not a generic type, then we just compare type 1:1
+                                y.SupersededEventArgsType == argType));
+                return supercededBy != null;
+            }
+        }
 
         public void ScopeExit(bool completed)
         {

src/Umbraco.Core/Events/SupersedeEventAttribute.cs

@@ -0,0 +1,20 @@
+using System;
+
+namespace Umbraco.Core.Events
+{
+    /// <summary>
+    /// This is used to know if the event arg attributed should supersede another event arg type when 
+    /// tracking events for the same entity. If one event args supercedes another then the event args that have been superseded
+    /// will mean that the event will not be dispatched or the args will be filtered to exclude the entity.
+    /// </summary>
+    [AttributeUsage(AttributeTargets.Class, AllowMultiple = true)]
+    internal class SupersedeEventAttribute : Attribute
+    {
+        public Type SupersededEventArgsType { get; private set; }
+
+        public SupersedeEventAttribute(Type supersededEventArgsType)
+        {
+            SupersededEventArgsType = supersededEventArgsType;
+        }
+    }
+}

src/Umbraco.Core/HashCodeCombiner.cs

@@ -1,5 +1,4 @@
 using System;
-using System.Collections.Generic;
 using System.Globalization;
 using System.IO;
 using System.Linq;
@@ -7,32 +6,32 @@ using System.Text;
 
 namespace Umbraco.Core
 {
-	/// <summary>
+    /// <summary>
-	/// Used to create a hash code from multiple objects.
+    /// Used to create a hash code from multiple objects.
-	/// </summary>
+    /// </summary>
-	/// <remarks>
+    /// <remarks>
-	/// .Net has a class the same as this: System.Web.Util.HashCodeCombiner and of course it works for all sorts of things
+    /// .Net has a class the same as this: System.Web.Util.HashCodeCombiner and of course it works for all sorts of things
-	/// which we've not included here as we just need a quick easy class for this in order to create a unique
+    /// which we've not included here as we just need a quick easy class for this in order to create a unique
-	/// hash of directories/files to see if they have changed.
+    /// hash of directories/files to see if they have changed.
-	/// </remarks>
+    /// </remarks>
-	internal class HashCodeCombiner
+    internal class HashCodeCombiner
-	{
+    {
-		private long _combinedHash = 5381L;
+        private long _combinedHash = 5381L;
 
-		internal void AddInt(int i)
+        internal void AddInt(int i)
-		{
+        {
-			_combinedHash = ((_combinedHash << 5) + _combinedHash) ^ i;
+            _combinedHash = ((_combinedHash << 5) + _combinedHash) ^ i;
-		}
+        }
 
-		internal void AddObject(object o)
+        internal void AddObject(object o)
-		{
+        {
-			AddInt(o.GetHashCode());
+            AddInt(o.GetHashCode());
-		}
+        }
 
-		internal void AddDateTime(DateTime d)
+        internal void AddDateTime(DateTime d)
-		{
+        {
-			AddInt(d.GetHashCode());
+            AddInt(d.GetHashCode());
-		}
+        }
 
         internal void AddString(string s)
         {
@@ -40,61 +39,61 @@ namespace Umbraco.Core
                 AddInt((StringComparer.InvariantCulture).GetHashCode(s));
         }
 
-		internal void AddCaseInsensitiveString(string s)
+        internal void AddCaseInsensitiveString(string s)
-		{
+        {
-			if (s != null)
+            if (s != null)
-				AddInt((StringComparer.InvariantCultureIgnoreCase).GetHashCode(s));
+                AddInt((StringComparer.InvariantCultureIgnoreCase).GetHashCode(s));
-		}
+        }
 
-		internal void AddFileSystemItem(FileSystemInfo f)
+        internal void AddFileSystemItem(FileSystemInfo f)
-		{
+        {
-			//if it doesn't exist, don't proceed.
+            //if it doesn't exist, don't proceed.
-			if (!f.Exists)
+            if (!f.Exists)
-				return;
+                return;
 
-			AddCaseInsensitiveString(f.FullName);
+            AddCaseInsensitiveString(f.FullName);
-			AddDateTime(f.CreationTimeUtc);
+            AddDateTime(f.CreationTimeUtc);
-			AddDateTime(f.LastWriteTimeUtc);
+            AddDateTime(f.LastWriteTimeUtc);
-			
-			//check if it is a file or folder 
-			var fileInfo = f as FileInfo;
-			if (fileInfo != null)
-			{
-				AddInt(fileInfo.Length.GetHashCode());
-			}
-			
-			var dirInfo = f as DirectoryInfo;
-			if (dirInfo != null)
-			{
-				foreach (var d in dirInfo.GetFiles())
-				{
-					AddFile(d);
-				}
-				foreach (var s in dirInfo.GetDirectories())
-				{
-					AddFolder(s);
-				}
-			}
-		}
 
-		internal void AddFile(FileInfo f)
+            //check if it is a file or folder 
-		{
+            var fileInfo = f as FileInfo;
-			AddFileSystemItem(f);			
+            if (fileInfo != null)
-		}
+            {
+                AddInt(fileInfo.Length.GetHashCode());
+            }
 
-		internal void AddFolder(DirectoryInfo d)
+            var dirInfo = f as DirectoryInfo;
-		{
+            if (dirInfo != null)
-			AddFileSystemItem(d);			
+            {
-		}
+                foreach (var d in dirInfo.GetFiles())
+                {
+                    AddFile(d);
+                }
+                foreach (var s in dirInfo.GetDirectories())
+                {
+                    AddFolder(s);
+                }
+            }
+        }
 
-		/// <summary>
+        internal void AddFile(FileInfo f)
-		/// Returns the hex code of the combined hash code
+        {
-		/// </summary>
+            AddFileSystemItem(f);
-		/// <returns></returns>
+        }
-		internal string GetCombinedHashCode()
-		{
-			return _combinedHash.ToString("x", CultureInfo.InvariantCulture);
-		}
 
-	}
+        internal void AddFolder(DirectoryInfo d)
+        {
+            AddFileSystemItem(d);
+        }
+
+        /// <summary>
+        /// Returns the hex code of the combined hash code
+        /// </summary>
+        /// <returns></returns>
+        internal string GetCombinedHashCode()
+        {
+            return _combinedHash.ToString("x", CultureInfo.InvariantCulture);
+        }
+
+    }
 }

src/Umbraco.Core/HashCodeHelper.cs

@@ -0,0 +1,104 @@
+using System.Collections.Generic;
+
+namespace Umbraco.Core
+{
+    /// <summary>
+    /// Borrowed from http://stackoverflow.com/a/2575444/694494
+    /// </summary>
+    internal static class HashCodeHelper
+    {
+        public static int GetHashCode<T1, T2>(T1 arg1, T2 arg2)
+        {
+            unchecked
+            {
+                return 31 * arg1.GetHashCode() + arg2.GetHashCode();
+            }
+        }
+
+        public static int GetHashCode<T1, T2, T3>(T1 arg1, T2 arg2, T3 arg3)
+        {
+            unchecked
+            {
+                int hash = arg1.GetHashCode();
+                hash = 31 * hash + arg2.GetHashCode();
+                return 31 * hash + arg3.GetHashCode();
+            }
+        }
+
+        public static int GetHashCode<T1, T2, T3, T4>(T1 arg1, T2 arg2, T3 arg3,
+            T4 arg4)
+        {
+            unchecked
+            {
+                int hash = arg1.GetHashCode();
+                hash = 31 * hash + arg2.GetHashCode();
+                hash = 31 * hash + arg3.GetHashCode();
+                return 31 * hash + arg4.GetHashCode();
+            }
+        }
+
+        public static int GetHashCode<T>(T[] list)
+        {
+            unchecked
+            {
+                int hash = 0;
+                foreach (var item in list)
+                {
+                    if (item == null) continue;
+                    hash = 31 * hash + item.GetHashCode();
+                }
+                return hash;
+            }
+        }
+
+        public static int GetHashCode<T>(IEnumerable<T> list)
+        {
+            unchecked
+            {
+                int hash = 0;
+                foreach (var item in list)
+                {
+                    if (item == null) continue;
+                    hash = 31 * hash + item.GetHashCode();
+                }
+                return hash;
+            }
+        }
+
+        /// <summary>
+        /// Gets a hashcode for a collection for that the order of items 
+        /// does not matter.
+        /// So {1, 2, 3} and {3, 2, 1} will get same hash code.
+        /// </summary>
+        public static int GetHashCodeForOrderNoMatterCollection<T>(
+            IEnumerable<T> list)
+        {
+            unchecked
+            {
+                int hash = 0;
+                int count = 0;
+                foreach (var item in list)
+                {
+                    if (item == null) continue;
+                    hash += item.GetHashCode();
+                    count++;
+                }
+                return 31 * hash + count.GetHashCode();
+            }
+        }
+
+        /// <summary>
+        /// Alternative way to get a hashcode is to use a fluent 
+        /// interface like this:<br />
+        /// return 0.CombineHashCode(field1).CombineHashCode(field2).
+        ///     CombineHashCode(field3);
+        /// </summary>
+        public static int CombineHashCode<T>(this int hashCode, T arg)
+        {
+            unchecked
+            {
+                return 31 * hashCode + arg.GetHashCode();
+            }
+        }
+    }
+}

src/Umbraco.Core/Models/ContentXmlEntity.cs

@@ -42,6 +42,7 @@ namespace Umbraco.Core.Models
         public Guid Key { get; set; }
         public DateTime CreateDate { get; set; }
         public DateTime UpdateDate { get; set; }
+        public DateTime? DeletedDate { get; set; }
 
         /// <summary>
         /// Special case, always return false, this will cause the repositories managing 
@@ -60,5 +61,7 @@ namespace Umbraco.Core.Models
             DeepCloneHelper.DeepCloneRefProperties(this, clone);
             return clone;
         }
+
+        
     }
 }

src/Umbraco.Core/Models/EntityBase/Entity.cs

@@ -101,6 +101,9 @@ namespace Umbraco.Core.Models.EntityBase
             set { SetPropertyValueAndDetectChanges(value, ref _updateDate, Ps.Value.UpdateDateSelector); }           
         }
 
+        [IgnoreDataMember]
+        public DateTime? DeletedDate { get; set; }
+
         internal virtual void ResetIdentity()
         {
             _hasIdentity = false;

src/Umbraco.Core/Models/EntityBase/IAggregateRoot.cs

@@ -3,7 +3,7 @@
     /// <summary>
     /// Marker interface for aggregate roots
     /// </summary>
-    public interface IAggregateRoot : IEntity
+    public interface IAggregateRoot : IDeletableEntity
     {
          
     }

src/Umbraco.Core/Models/EntityBase/IDeletableEntity.cs

@@ -0,0 +1,11 @@
+using System;
+using System.Runtime.Serialization;
+
+namespace Umbraco.Core.Models.EntityBase
+{
+    public interface IDeletableEntity : IEntity
+    {
+        [DataMember]
+        DateTime? DeletedDate { get; set; }
+    }
+}

src/Umbraco.Core/Models/EntityBase/IEntity.cs

@@ -20,7 +20,7 @@ namespace Umbraco.Core.Models.EntityBase
         /// <summary>
         /// Guid based Id
         /// </summary>
-        /// <remarks>The key is currectly used to store the Unique Id from the 
+        /// <remarks>The key is currectly used to store the Unique Id from the
         /// umbracoNode table, which many of the entities are based on.</remarks>
         [DataMember]
         Guid Key { get; set; }

src/Umbraco.Core/OrderedHashSet.cs

@@ -11,7 +11,7 @@ namespace Umbraco.Core
     {
         private readonly bool _keepOldest;
 
-        public OrderedHashSet(bool keepOldest = true)
+        public OrderedHashSet(bool keepOldest = true) 
         {
             _keepOldest = keepOldest;
         }

src/Umbraco.Core/Persistence/Repositories/ContentXmlRepository.cs

@@ -70,6 +70,8 @@ namespace Umbraco.Core.Persistence.Repositories
         {
             //Remove 'published' xml from the cmsContentXml table for the unpublished content
             Database.Delete<ContentXmlDto>("WHERE nodeId = @Id", new { Id = entity.Id });
+
+            entity.DeletedDate = DateTime.Now;
         }
 
         protected override void PersistNewItem(ContentXmlEntity<TContent> entity)

src/Umbraco.Core/Persistence/Repositories/DataTypeDefinitionRepository.cs

@@ -270,6 +270,8 @@ AND umbracoNode.id <> @id",
 
             //Delete (base) node data
             Database.Delete<NodeDto>("WHERE uniqueID = @Id", new { Id = entity.Key });
+
+            entity.DeletedDate = DateTime.Now;
         }
 
         #endregion
@@ -539,6 +541,8 @@ AND umbracoNode.id <> @id",
                 Database.Execute(
                     "DELETE FROM cmsDataTypePreValues WHERE id=@Id",
                     new { Id = entity.Id });
+
+                entity.DeletedDate = DateTime.Now;
             }
 
             protected override void PersistNewItem(PreValueEntity entity)

src/Umbraco.Core/Persistence/Repositories/DictionaryRepository.cs

@@ -195,6 +195,8 @@ namespace Umbraco.Core.Persistence.Repositories
             //Clear the cache entries that exist by uniqueid/item key
             IsolatedCache.ClearCacheItem(GetCacheIdKey<IDictionaryItem>(entity.ItemKey));
             IsolatedCache.ClearCacheItem(GetCacheIdKey<IDictionaryItem>(entity.Key));
+
+            entity.DeletedDate = DateTime.Now;
         }
 
         private void RecursiveDelete(Guid parentId)

src/Umbraco.Core/Persistence/Repositories/EntityContainerRepository.cs

@@ -167,6 +167,8 @@ namespace Umbraco.Core.Persistence.Repositories
 
             // delete
             Database.Delete(nodeDto);
+
+            entity.DeletedDate = DateTime.Now;
         }
 
         protected override void PersistNewItem(EntityContainer entity)

src/Umbraco.Core/Persistence/Repositories/PetaPocoRepositoryBase.cs

@@ -74,6 +74,7 @@ namespace Umbraco.Core.Persistence.Repositories
             {
                 Database.Execute(delete, new { Id = GetEntityId(entity) });
             }
+            entity.DeletedDate = DateTime.Now;
         }
     }
 }

src/Umbraco.Core/Persistence/Repositories/TemplateRepository.cs

@@ -311,6 +311,8 @@ namespace Umbraco.Core.Persistence.Repositories
                 var masterpageName = string.Concat(entity.Alias, ".master");
                 _masterpagesFileSystem.DeleteFile(masterpageName);
             }
+
+            entity.DeletedDate = DateTime.Now;
         }
 
         #endregion

src/Umbraco.Core/TypeExtensions.cs

@@ -166,8 +166,8 @@ namespace Umbraco.Core
 					return true;
 			}
 			return false;
-		}
+		}
-
+        
 		/// <summary>
 		/// Determines whether [is of generic type] [the specified type].
 		/// </summary>

src/Umbraco.Core/TypeHelper.cs

@@ -2,6 +2,7 @@ using System;
 using System.Collections;
 using System.Collections.Concurrent;
 using System.Collections.Generic;
+using System.Collections.ObjectModel;
 using System.Linq;
 using System.Reflection;
 
@@ -15,11 +16,51 @@ namespace Umbraco.Core
 	{
 	    private static readonly ConcurrentDictionary<Tuple<Type, bool, bool, bool>, PropertyInfo[]> GetPropertiesCache
             = new ConcurrentDictionary<Tuple<Type, bool, bool, bool>, PropertyInfo[]>();
-		private static readonly ConcurrentDictionary<Type, FieldInfo[]> GetFieldsCache 
+		private static readonly ConcurrentDictionary<Type, FieldInfo[]> GetFieldsCache
             = new ConcurrentDictionary<Type, FieldInfo[]>();
 
         private static readonly Assembly[] EmptyAssemblies  = new Assembly[0];
-        
+
+        /// <summary>
+        /// Based on a type we'll check if it is IEnumerable{T} (or similar) and if so we'll return a List{T}, this will also deal with array types and return List{T} for those too.
+        /// If it cannot be done, null is returned.
+        /// </summary>
+        /// <param name="obj"></param>
+        /// <returns></returns>
+	    internal static IList CreateGenericEnumerableFromObject(object obj)
+        {
+            var type = obj.GetType();
+
+            if (type.IsGenericType)
+            {
+                var genericTypeDef = type.GetGenericTypeDefinition();
+
+                if (genericTypeDef == typeof(IEnumerable<>)
+                    || genericTypeDef == typeof(ICollection<>)
+                    || genericTypeDef == typeof(Collection<>)
+                    || genericTypeDef == typeof(IList<>)
+                    || genericTypeDef == typeof(List<>)
+                    //this will occur when Linq is used and we get the odd WhereIterator or DistinctIterators since those are special iterator types
+                    || obj is IEnumerable)
+                {
+                    //if it is a IEnumerable<>, IList<T> or ICollection<> we'll use a List<>
+                    var genericType = typeof(List<>).MakeGenericType(type.GetGenericArguments());
+                    //pass in obj to fill the list
+                    return (IList)Activator.CreateInstance(genericType, obj);
+                }
+	        }
+
+	        if (type.IsArray)
+	        {
+                //if its an array, we'll use a List<>
+	            var genericType = typeof(List<>).MakeGenericType(type.GetElementType());
+                //pass in obj to fill the list
+	            return (IList)Activator.CreateInstance(genericType, obj);
+            }
+
+            return null;
+	    }
+
         /// <summary>
         /// Checks if the method is actually overriding a base method
         /// </summary>
@@ -45,8 +86,8 @@ namespace Umbraco.Core
             if (assembly.IsAppCodeAssembly() || assembly.IsGlobalAsaxAssembly())
                 return EmptyAssemblies;
 
-            
+
-            // find all assembly references that are referencing the current type's assembly since we 
+            // find all assembly references that are referencing the current type's assembly since we
             // should only be scanning those assemblies because any other assembly will definitely not
             // contain sub type's of the one we're currently looking for
             var name = assembly.GetName().Name;

src/Umbraco.Core/Umbraco.Core.csproj

@@ -339,8 +339,11 @@
     <Compile Include="Events\IDeletingMediaFilesEventArgs.cs" />
     <Compile Include="Events\ScopeEventDispatcherBase.cs" />
     <Compile Include="Events\ScopeLifespanMessagesFactory.cs" />
+    <Compile Include="Events\SupersedeEventAttribute.cs" />
     <Compile Include="Exceptions\ConnectionException.cs" />
+    <Compile Include="HashCodeHelper.cs" />
     <Compile Include="IHttpContextAccessor.cs" />
+    <Compile Include="Models\EntityBase\IDeletableEntity.cs" />
     <Compile Include="Models\PublishedContent\PublishedContentTypeConverter.cs" />
     <Compile Include="OrderedHashSet.cs" />
     <Compile Include="Events\UninstallPackageEventArgs.cs" />

src/Umbraco.Tests/Cache/CacheRefresherEventHandlerTests.cs

@@ -7,6 +7,7 @@ using Umbraco.Core.Models.Membership;
 using Umbraco.Core.Services;
 using Umbraco.Tests.TestHelpers;
 using Umbraco.Web.Cache;
+using System.Linq;
 
 namespace Umbraco.Tests.Cache
 {
@@ -31,70 +32,70 @@ namespace Umbraco.Tests.Cache
                 new EventDefinition<ISectionService, EventArgs>(null, ServiceContext.SectionService, new EventArgs(), "Deleted"),
                 new EventDefinition<ISectionService, EventArgs>(null, ServiceContext.SectionService, new EventArgs(), "New"),
 
-                new EventDefinition<IUserService, SaveEventArgs<IUserType>>(null, ServiceContext.UserService, new SaveEventArgs<IUserType>((IUserType) null)),
+                new EventDefinition<IUserService, SaveEventArgs<IUserType>>(null, ServiceContext.UserService, new SaveEventArgs<IUserType>(Enumerable.Empty<IUserType>())),
-                new EventDefinition<IUserService, DeleteEventArgs<IUserType>>(null, ServiceContext.UserService, new DeleteEventArgs<IUserType>((IUserType) null)),
+                new EventDefinition<IUserService, DeleteEventArgs<IUserType>>(null, ServiceContext.UserService, new DeleteEventArgs<IUserType>(Enumerable.Empty<IUserType>())),
 
-                new EventDefinition<IUserService, SaveEventArgs<IUser>>(null, ServiceContext.UserService, new SaveEventArgs<IUser>((IUser) null)),
+                new EventDefinition<IUserService, SaveEventArgs<IUser>>(null, ServiceContext.UserService, new SaveEventArgs<IUser>(Enumerable.Empty<IUser>())),
-                new EventDefinition<IUserService, DeleteEventArgs<IUser>>(null, ServiceContext.UserService, new DeleteEventArgs<IUser>((IUser) null)),
+                new EventDefinition<IUserService, DeleteEventArgs<IUser>>(null, ServiceContext.UserService, new DeleteEventArgs<IUser>(Enumerable.Empty<IUser>())),
-                new EventDefinition<IUserService, DeleteEventArgs<IUser>>(null, ServiceContext.UserService, new DeleteEventArgs<IUser>((IUser) null)),
+                new EventDefinition<IUserService, DeleteEventArgs<IUser>>(null, ServiceContext.UserService, new DeleteEventArgs<IUser>(Enumerable.Empty<IUser>())),
 
-                new EventDefinition<ILocalizationService, SaveEventArgs<IDictionaryItem>>(null, ServiceContext.LocalizationService, new SaveEventArgs<IDictionaryItem>((IDictionaryItem) null)),
+                new EventDefinition<ILocalizationService, SaveEventArgs<IDictionaryItem>>(null, ServiceContext.LocalizationService, new SaveEventArgs<IDictionaryItem>(Enumerable.Empty<IDictionaryItem>())),
-                new EventDefinition<ILocalizationService, DeleteEventArgs<IDictionaryItem>>(null, ServiceContext.LocalizationService, new DeleteEventArgs<IDictionaryItem>((IDictionaryItem) null)),
+                new EventDefinition<ILocalizationService, DeleteEventArgs<IDictionaryItem>>(null, ServiceContext.LocalizationService, new DeleteEventArgs<IDictionaryItem>(Enumerable.Empty<IDictionaryItem>())),
 
-                new EventDefinition<IDataTypeService, SaveEventArgs<IDataTypeDefinition>>(null, ServiceContext.DataTypeService, new SaveEventArgs<IDataTypeDefinition>((IDataTypeDefinition) null)),
+                new EventDefinition<IDataTypeService, SaveEventArgs<IDataTypeDefinition>>(null, ServiceContext.DataTypeService, new SaveEventArgs<IDataTypeDefinition>(Enumerable.Empty<IDataTypeDefinition>())),
-                new EventDefinition<IDataTypeService, DeleteEventArgs<IDataTypeDefinition>>(null, ServiceContext.DataTypeService, new DeleteEventArgs<IDataTypeDefinition>((IDataTypeDefinition) null)),
+                new EventDefinition<IDataTypeService, DeleteEventArgs<IDataTypeDefinition>>(null, ServiceContext.DataTypeService, new DeleteEventArgs<IDataTypeDefinition>(Enumerable.Empty<IDataTypeDefinition>())),
 
-                new EventDefinition<IFileService, SaveEventArgs<Stylesheet>>(null, ServiceContext.FileService, new SaveEventArgs<Stylesheet>((Stylesheet) null)),
+                new EventDefinition<IFileService, SaveEventArgs<Stylesheet>>(null, ServiceContext.FileService, new SaveEventArgs<Stylesheet>(Enumerable.Empty<Stylesheet>())),
-                new EventDefinition<IFileService, DeleteEventArgs<Stylesheet>>(null, ServiceContext.FileService, new DeleteEventArgs<Stylesheet>((Stylesheet) null)),
+                new EventDefinition<IFileService, DeleteEventArgs<Stylesheet>>(null, ServiceContext.FileService, new DeleteEventArgs<Stylesheet>(Enumerable.Empty<Stylesheet>())),
 
-                new EventDefinition<IDomainService, SaveEventArgs<IDomain>>(null, ServiceContext.DomainService, new SaveEventArgs<IDomain>((IDomain) null)),
+                new EventDefinition<IDomainService, SaveEventArgs<IDomain>>(null, ServiceContext.DomainService, new SaveEventArgs<IDomain>(Enumerable.Empty<IDomain>())),
-                new EventDefinition<IDomainService, DeleteEventArgs<IDomain>>(null, ServiceContext.DomainService, new DeleteEventArgs<IDomain>((IDomain) null)),
+                new EventDefinition<IDomainService, DeleteEventArgs<IDomain>>(null, ServiceContext.DomainService, new DeleteEventArgs<IDomain>(Enumerable.Empty<IDomain>())),
 
-                new EventDefinition<ILocalizationService, SaveEventArgs<ILanguage>>(null, ServiceContext.LocalizationService, new SaveEventArgs<ILanguage>((ILanguage) null)),
+                new EventDefinition<ILocalizationService, SaveEventArgs<ILanguage>>(null, ServiceContext.LocalizationService, new SaveEventArgs<ILanguage>(Enumerable.Empty<ILanguage>())),
-                new EventDefinition<ILocalizationService, DeleteEventArgs<ILanguage>>(null, ServiceContext.LocalizationService, new DeleteEventArgs<ILanguage>((ILanguage) null)),
+                new EventDefinition<ILocalizationService, DeleteEventArgs<ILanguage>>(null, ServiceContext.LocalizationService, new DeleteEventArgs<ILanguage>(Enumerable.Empty<ILanguage>())),
 
-                new EventDefinition<IContentTypeService, SaveEventArgs<IContentType>>(null, ServiceContext.ContentTypeService, new SaveEventArgs<IContentType>((IContentType) null)),
+                new EventDefinition<IContentTypeService, SaveEventArgs<IContentType>>(null, ServiceContext.ContentTypeService, new SaveEventArgs<IContentType>(Enumerable.Empty<IContentType>())),
-                new EventDefinition<IContentTypeService, DeleteEventArgs<IContentType>>(null, ServiceContext.ContentTypeService, new DeleteEventArgs<IContentType>((IContentType) null)),
+                new EventDefinition<IContentTypeService, DeleteEventArgs<IContentType>>(null, ServiceContext.ContentTypeService, new DeleteEventArgs<IContentType>(Enumerable.Empty<IContentType>())),
-                new EventDefinition<IContentTypeService, SaveEventArgs<IMediaType>>(null, ServiceContext.ContentTypeService, new SaveEventArgs<IMediaType>((IMediaType) null)),
+                new EventDefinition<IContentTypeService, SaveEventArgs<IMediaType>>(null, ServiceContext.ContentTypeService, new SaveEventArgs<IMediaType>(Enumerable.Empty<IMediaType>())),
-                new EventDefinition<IContentTypeService, DeleteEventArgs<IMediaType>>(null, ServiceContext.ContentTypeService, new DeleteEventArgs<IMediaType>((IMediaType) null)),
+                new EventDefinition<IContentTypeService, DeleteEventArgs<IMediaType>>(null, ServiceContext.ContentTypeService, new DeleteEventArgs<IMediaType>(Enumerable.Empty<IMediaType>())),
 
-                new EventDefinition<IMemberTypeService, SaveEventArgs<IMemberType>>(null, ServiceContext.MemberTypeService, new SaveEventArgs<IMemberType>((IMemberType) null)),
+                new EventDefinition<IMemberTypeService, SaveEventArgs<IMemberType>>(null, ServiceContext.MemberTypeService, new SaveEventArgs<IMemberType>(Enumerable.Empty<IMemberType>())),
-                new EventDefinition<IMemberTypeService, DeleteEventArgs<IMemberType>>(null, ServiceContext.MemberTypeService, new DeleteEventArgs<IMemberType>((IMemberType) null)),
+                new EventDefinition<IMemberTypeService, DeleteEventArgs<IMemberType>>(null, ServiceContext.MemberTypeService, new DeleteEventArgs<IMemberType>(Enumerable.Empty<IMemberType>())),
 
-                new EventDefinition<IFileService, SaveEventArgs<ITemplate>>(null, ServiceContext.FileService, new SaveEventArgs<ITemplate>((ITemplate) null)),
+                new EventDefinition<IFileService, SaveEventArgs<ITemplate>>(null, ServiceContext.FileService, new SaveEventArgs<ITemplate>(Enumerable.Empty<ITemplate>())),
-                new EventDefinition<IFileService, DeleteEventArgs<ITemplate>>(null, ServiceContext.FileService, new DeleteEventArgs<ITemplate>((ITemplate) null)),
+                new EventDefinition<IFileService, DeleteEventArgs<ITemplate>>(null, ServiceContext.FileService, new DeleteEventArgs<ITemplate>(Enumerable.Empty<ITemplate>())),
 
-                new EventDefinition<IMacroService, SaveEventArgs<IMacro>>(null, ServiceContext.MacroService, new SaveEventArgs<IMacro>((IMacro) null)),
+                new EventDefinition<IMacroService, SaveEventArgs<IMacro>>(null, ServiceContext.MacroService, new SaveEventArgs<IMacro>(Enumerable.Empty<IMacro>())),
-                new EventDefinition<IMacroService, DeleteEventArgs<IMacro>>(null, ServiceContext.MacroService, new DeleteEventArgs<IMacro>((IMacro) null)),
+                new EventDefinition<IMacroService, DeleteEventArgs<IMacro>>(null, ServiceContext.MacroService, new DeleteEventArgs<IMacro>(Enumerable.Empty<IMacro>())),
 
-                new EventDefinition<IMemberService, SaveEventArgs<IMember>>(null, ServiceContext.MemberService, new SaveEventArgs<IMember>((IMember) null)),
+                new EventDefinition<IMemberService, SaveEventArgs<IMember>>(null, ServiceContext.MemberService, new SaveEventArgs<IMember>(Enumerable.Empty<IMember>())),
-                new EventDefinition<IMemberService, DeleteEventArgs<IMember>>(null, ServiceContext.MemberService, new DeleteEventArgs<IMember>((IMember) null)),
+                new EventDefinition<IMemberService, DeleteEventArgs<IMember>>(null, ServiceContext.MemberService, new DeleteEventArgs<IMember>(Enumerable.Empty<IMember>())),
 
-                new EventDefinition<IMemberGroupService, SaveEventArgs<IMemberGroup>>(null, ServiceContext.MemberGroupService, new SaveEventArgs<IMemberGroup>((IMemberGroup) null)),
+                new EventDefinition<IMemberGroupService, SaveEventArgs<IMemberGroup>>(null, ServiceContext.MemberGroupService, new SaveEventArgs<IMemberGroup>(Enumerable.Empty<IMemberGroup>())),
-                new EventDefinition<IMemberGroupService, DeleteEventArgs<IMemberGroup>>(null, ServiceContext.MemberGroupService, new DeleteEventArgs<IMemberGroup>((IMemberGroup) null)),
+                new EventDefinition<IMemberGroupService, DeleteEventArgs<IMemberGroup>>(null, ServiceContext.MemberGroupService, new DeleteEventArgs<IMemberGroup>(Enumerable.Empty<IMemberGroup>())),
 
-                new EventDefinition<IMediaService, SaveEventArgs<IMedia>>(null, ServiceContext.MediaService, new SaveEventArgs<IMedia>((IMedia) null)),
+                new EventDefinition<IMediaService, SaveEventArgs<IMedia>>(null, ServiceContext.MediaService, new SaveEventArgs<IMedia>(Enumerable.Empty<IMedia>())),
-                new EventDefinition<IMediaService, DeleteEventArgs<IMedia>>(null, ServiceContext.MediaService, new DeleteEventArgs<IMedia>((IMedia) null)),
+                new EventDefinition<IMediaService, DeleteEventArgs<IMedia>>(null, ServiceContext.MediaService, new DeleteEventArgs<IMedia>(Enumerable.Empty<IMedia>())),
                 new EventDefinition<IMediaService, MoveEventArgs<IMedia>>(null, ServiceContext.MediaService, new MoveEventArgs<IMedia>(new MoveEventInfo<IMedia>(null, "", -1)), "Moved"),
                 new EventDefinition<IMediaService, MoveEventArgs<IMedia>>(null, ServiceContext.MediaService, new MoveEventArgs<IMedia>(new MoveEventInfo<IMedia>(null, "", -1)), "Trashed"),
                 new EventDefinition<IMediaService, RecycleBinEventArgs>(null, ServiceContext.MediaService, new RecycleBinEventArgs(Guid.NewGuid(), new Dictionary<int, IEnumerable<Property>>(), true)),
 
-                new EventDefinition<IContentService, SaveEventArgs<IContent>>(null, ServiceContext.ContentService, new SaveEventArgs<IContent>((IContent) null)),
+                new EventDefinition<IContentService, SaveEventArgs<IContent>>(null, ServiceContext.ContentService, new SaveEventArgs<IContent>(Enumerable.Empty<IContent>())),
-                new EventDefinition<IContentService, DeleteEventArgs<IContent>>(null, ServiceContext.ContentService, new DeleteEventArgs<IContent>((IContent) null)),
+                new EventDefinition<IContentService, DeleteEventArgs<IContent>>(null, ServiceContext.ContentService, new DeleteEventArgs<IContent>(Enumerable.Empty<IContent>())),
                 new EventDefinition<IContentService, CopyEventArgs<IContent>>(null, ServiceContext.ContentService, new CopyEventArgs<IContent>(null, null, -1)),
                 new EventDefinition<IContentService, MoveEventArgs<IContent>>(null, ServiceContext.ContentService, new MoveEventArgs<IContent>(new MoveEventInfo<IContent>(null, "", -1)), "Trashed"),
                 new EventDefinition<IContentService, RecycleBinEventArgs>(null, ServiceContext.ContentService, new RecycleBinEventArgs(Guid.NewGuid(), new Dictionary<int, IEnumerable<Property>>(), true)),
-                new EventDefinition<IContentService, PublishEventArgs<IContent>>(null, ServiceContext.ContentService, new PublishEventArgs<IContent>((IContent) null), "Published"),
+                new EventDefinition<IContentService, PublishEventArgs<IContent>>(null, ServiceContext.ContentService, new PublishEventArgs<IContent>(Enumerable.Empty<IContent>()), "Published"),
-                new EventDefinition<IContentService, PublishEventArgs<IContent>>(null, ServiceContext.ContentService, new PublishEventArgs<IContent>((IContent) null), "UnPublished"),
+                new EventDefinition<IContentService, PublishEventArgs<IContent>>(null, ServiceContext.ContentService, new PublishEventArgs<IContent>(Enumerable.Empty<IContent>()), "UnPublished"),
 
-                new EventDefinition<IPublicAccessService, SaveEventArgs<PublicAccessEntry>>(null, ServiceContext.PublicAccessService, new SaveEventArgs<PublicAccessEntry>((PublicAccessEntry) null)),
+                new EventDefinition<IPublicAccessService, SaveEventArgs<PublicAccessEntry>>(null, ServiceContext.PublicAccessService, new SaveEventArgs<PublicAccessEntry>(Enumerable.Empty<PublicAccessEntry>())),
-                new EventDefinition<IPublicAccessService, DeleteEventArgs<PublicAccessEntry>>(null, ServiceContext.PublicAccessService, new DeleteEventArgs<PublicAccessEntry>((PublicAccessEntry) null)),
+                new EventDefinition<IPublicAccessService, DeleteEventArgs<PublicAccessEntry>>(null, ServiceContext.PublicAccessService, new DeleteEventArgs<PublicAccessEntry>(Enumerable.Empty<PublicAccessEntry>())),
 
-                new EventDefinition<IRelationService, SaveEventArgs<IRelationType>>(null, ServiceContext.RelationService, new SaveEventArgs<IRelationType>((IRelationType) null)),
+                new EventDefinition<IRelationService, SaveEventArgs<IRelationType>>(null, ServiceContext.RelationService, new SaveEventArgs<IRelationType>(Enumerable.Empty<IRelationType>())),
-                new EventDefinition<IRelationService, DeleteEventArgs<IRelationType>>(null, ServiceContext.RelationService, new DeleteEventArgs<IRelationType>((IRelationType) null)),
+                new EventDefinition<IRelationService, DeleteEventArgs<IRelationType>>(null, ServiceContext.RelationService, new DeleteEventArgs<IRelationType>(Enumerable.Empty<IRelationType>())),
 
-                new EventDefinition<IRelationService, SaveEventArgs<IRelationType>>(null, ServiceContext.RelationService, new SaveEventArgs<IRelationType>((IRelationType) null)),
+                new EventDefinition<IRelationService, SaveEventArgs<IRelationType>>(null, ServiceContext.RelationService, new SaveEventArgs<IRelationType>(Enumerable.Empty<IRelationType>())),
-                new EventDefinition<IRelationService, DeleteEventArgs<IRelationType>>(null, ServiceContext.RelationService, new DeleteEventArgs<IRelationType>((IRelationType) null)),
+                new EventDefinition<IRelationService, DeleteEventArgs<IRelationType>>(null, ServiceContext.RelationService, new DeleteEventArgs<IRelationType>(Enumerable.Empty<IRelationType>())),
             };
 
             foreach (var definition in definitions)

src/Umbraco.Tests/Scoping/ScopeEventDispatcherTests.cs

@@ -4,13 +4,16 @@ using System.Linq;
 using Moq;
 using NUnit.Framework;
 using Umbraco.Core.Events;
+using Umbraco.Core.Models;
 using Umbraco.Core.Persistence;
 using Umbraco.Core.Scoping;
+using Umbraco.Tests.TestHelpers;
+using Umbraco.Tests.TestHelpers.Entities;
 
 namespace Umbraco.Tests.Scoping
 {
     [TestFixture]
-    public class ScopeEventDispatcherTests
+    public class ScopeEventDispatcherTests : BaseUmbracoConfigurationTest
     {
         [SetUp]
         public void Setup()
@@ -79,7 +82,7 @@ namespace Umbraco.Tests.Scoping
                 var events = scope.Events.GetEvents(EventDefinitionFilter.All).ToArray();
 
                 var knownNames = new[] { "DoThing1", "DoThing2", "DoThing3" };
-                var knownArgTypes = new[] { typeof (SaveEventArgs<string>), typeof (SaveEventArgs<int>), typeof (SaveEventArgs<decimal>) };
+                var knownArgTypes = new[] { typeof(SaveEventArgs<string>), typeof(SaveEventArgs<int>), typeof(SaveEventArgs<decimal>) };
 
                 for (var i = 0; i < events.Length; i++)
                 {
@@ -89,6 +92,166 @@ namespace Umbraco.Tests.Scoping
             }
         }
 
+        [Test]
+        public void SupersededEvents()
+        {
+            DoSaveForContent += OnDoThingFail;
+            DoDeleteForContent += OnDoThingFail;
+            DoForTestArgs += OnDoThingFail;
+            DoForTestArgs2 += OnDoThingFail;
+            
+            var contentType = MockedContentTypes.CreateBasicContentType();
+
+            var content1 = MockedContent.CreateBasicContent(contentType);
+            content1.Id = 123;
+
+            var content2 = MockedContent.CreateBasicContent(contentType);
+            content2.Id = 456;
+
+            var content3 = MockedContent.CreateBasicContent(contentType);
+            content3.Id = 789;
+
+            var scopeProvider = new ScopeProvider(Mock.Of<IDatabaseFactory2>());
+            using (var scope = scopeProvider.CreateScope(eventDispatcher: new PassiveEventDispatcher()))
+            {
+                
+                //content1 will be filtered from the args
+                scope.Events.Dispatch(DoSaveForContent, this, new SaveEventArgs<IContent>(new[]{ content1 , content3}));
+                scope.Events.Dispatch(DoDeleteForContent, this, new DeleteEventArgs<IContent>(content1));
+                scope.Events.Dispatch(DoSaveForContent, this, new SaveEventArgs<IContent>(content2));
+                //this entire event will be filtered
+                scope.Events.Dispatch(DoForTestArgs, this, new TestEventArgs(content1));
+                scope.Events.Dispatch(DoForTestArgs2, this, new TestEventArgs2(content1));
+
+                // events have been queued
+                var events = scope.Events.GetEvents(EventDefinitionFilter.All).ToArray();
+                Assert.AreEqual(4, events.Length);
+
+                Assert.AreEqual(typeof(SaveEventArgs<IContent>), events[0].Args.GetType());
+                Assert.AreEqual(1, ((SaveEventArgs<IContent>)events[0].Args).SavedEntities.Count());
+                Assert.AreEqual(content3.Id, ((SaveEventArgs<IContent>)events[0].Args).SavedEntities.First().Id);
+
+                Assert.AreEqual(typeof(DeleteEventArgs<IContent>), events[1].Args.GetType());
+                Assert.AreEqual(content1.Id, ((DeleteEventArgs<IContent>) events[1].Args).DeletedEntities.First().Id);
+
+                Assert.AreEqual(typeof(SaveEventArgs<IContent>), events[2].Args.GetType());
+                Assert.AreEqual(content2.Id, ((SaveEventArgs<IContent>)events[2].Args).SavedEntities.First().Id);
+
+                Assert.AreEqual(typeof(TestEventArgs2), events[3].Args.GetType());
+            }
+        }
+
+        /// <summary>
+        /// This will test that when we track events that before we Get the events we normalize all of the
+        /// event entities to be the latest one (most current) found amongst the event so that there is 
+        /// no 'stale' entities in any of the args
+        /// </summary>
+        [Test]
+        public void LatestEntities()
+        {
+            DoSaveForContent += OnDoThingFail;            
+
+            var now = DateTime.Now;
+            var contentType = MockedContentTypes.CreateBasicContentType();
+            var content1 = MockedContent.CreateBasicContent(contentType);
+            content1.Id = 123;
+            content1.UpdateDate = now.AddMinutes(1);
+            var content2 = MockedContent.CreateBasicContent(contentType);
+            content2.Id = 123;
+            content2.UpdateDate = now.AddMinutes(2);
+            var content3 = MockedContent.CreateBasicContent(contentType);
+            content3.Id = 123;
+            content3.UpdateDate = now.AddMinutes(3);
+
+            var scopeProvider = new ScopeProvider(Mock.Of<IDatabaseFactory2>());
+            using (var scope = scopeProvider.CreateScope(eventDispatcher: new PassiveEventDispatcher()))
+            {                                
+                scope.Events.Dispatch(DoSaveForContent, this, new SaveEventArgs<IContent>(content1));
+                scope.Events.Dispatch(DoSaveForContent, this, new SaveEventArgs<IContent>(content2));
+                scope.Events.Dispatch(DoSaveForContent, this, new SaveEventArgs<IContent>(content3));
+
+                // events have been queued
+                var events = scope.Events.GetEvents(EventDefinitionFilter.All).ToArray();
+                Assert.AreEqual(3, events.Length);
+                
+                foreach (var t in events)
+                {
+                    var args = (SaveEventArgs<IContent>)t.Args;
+                    foreach (var entity in args.SavedEntities)
+                    {
+                        Assert.AreEqual(content3, entity);
+                        Assert.IsTrue(object.ReferenceEquals(content3, entity));
+                    }
+                }
+            }
+        }
+
+        [Test]
+        public void FirstIn()
+        {
+            DoSaveForContent += OnDoThingFail;
+
+            var now = DateTime.Now;
+            var contentType = MockedContentTypes.CreateBasicContentType();
+            var content1 = MockedContent.CreateBasicContent(contentType);
+            content1.Id = 123;
+            content1.UpdateDate = now.AddMinutes(1);
+            var content2 = MockedContent.CreateBasicContent(contentType);
+            content2.Id = 123;
+            content1.UpdateDate = now.AddMinutes(2);
+            var content3 = MockedContent.CreateBasicContent(contentType);
+            content3.Id = 123;
+            content1.UpdateDate = now.AddMinutes(3);
+
+            var scopeProvider = new ScopeProvider(Mock.Of<IDatabaseFactory2>());
+            using (var scope = scopeProvider.CreateScope(eventDispatcher: new PassiveEventDispatcher()))
+            {
+                scope.Events.Dispatch(DoSaveForContent, this, new SaveEventArgs<IContent>(content1));
+                scope.Events.Dispatch(DoSaveForContent, this, new SaveEventArgs<IContent>(content2));
+                scope.Events.Dispatch(DoSaveForContent, this, new SaveEventArgs<IContent>(content3));
+
+                // events have been queued
+                var events = scope.Events.GetEvents(EventDefinitionFilter.FirstIn).ToArray();
+                Assert.AreEqual(1, events.Length);                
+                Assert.AreEqual(content1, ((SaveEventArgs<IContent>) events[0].Args).SavedEntities.First());
+                Assert.IsTrue(object.ReferenceEquals(content1, ((SaveEventArgs<IContent>)events[0].Args).SavedEntities.First()));
+                Assert.AreEqual(content1.UpdateDate, ((SaveEventArgs<IContent>) events[0].Args).SavedEntities.First().UpdateDate);
+            }
+        }
+
+        [Test]
+        public void LastIn()
+        {
+            DoSaveForContent += OnDoThingFail;
+
+            var now = DateTime.Now;
+            var contentType = MockedContentTypes.CreateBasicContentType();
+            var content1 = MockedContent.CreateBasicContent(contentType);
+            content1.Id = 123;
+            content1.UpdateDate = now.AddMinutes(1);
+            var content2 = MockedContent.CreateBasicContent(contentType);
+            content2.Id = 123;
+            content2.UpdateDate = now.AddMinutes(2);
+            var content3 = MockedContent.CreateBasicContent(contentType);
+            content3.Id = 123;
+            content3.UpdateDate = now.AddMinutes(3);
+
+            var scopeProvider = new ScopeProvider(Mock.Of<IDatabaseFactory2>());
+            using (var scope = scopeProvider.CreateScope(eventDispatcher: new PassiveEventDispatcher()))
+            {
+                scope.Events.Dispatch(DoSaveForContent, this, new SaveEventArgs<IContent>(content1));
+                scope.Events.Dispatch(DoSaveForContent, this, new SaveEventArgs<IContent>(content2));
+                scope.Events.Dispatch(DoSaveForContent, this, new SaveEventArgs<IContent>(content3));
+
+                // events have been queued
+                var events = scope.Events.GetEvents(EventDefinitionFilter.LastIn).ToArray();
+                Assert.AreEqual(1, events.Length);
+                Assert.AreEqual(content3, ((SaveEventArgs<IContent>)events[0].Args).SavedEntities.First());
+                Assert.IsTrue(object.ReferenceEquals(content3, ((SaveEventArgs<IContent>)events[0].Args).SavedEntities.First()));
+                Assert.AreEqual(content3.UpdateDate, ((SaveEventArgs<IContent>)events[0].Args).SavedEntities.First().UpdateDate);
+            }
+        }
+
         [TestCase(true)]
         [TestCase(false)]
         public void EventsDispatching_Passive(bool complete)
@@ -177,12 +340,41 @@ namespace Umbraco.Tests.Scoping
             Assert.Fail();
         }
 
+        public static event EventHandler<SaveEventArgs<IContent>> DoSaveForContent;
+        public static event EventHandler<DeleteEventArgs<IContent>> DoDeleteForContent;
+        public static event EventHandler<TestEventArgs> DoForTestArgs;
+        public static event EventHandler<TestEventArgs2> DoForTestArgs2;
         public static event EventHandler<SaveEventArgs<string>> DoThing1;
 
         public static event EventHandler<SaveEventArgs<int>> DoThing2;
 
         public static event TypedEventHandler<ScopeEventDispatcherTests, SaveEventArgs<decimal>> DoThing3;
 
+        public class TestEventArgs : CancellableObjectEventArgs
+        {
+            public TestEventArgs(object eventObject) : base(eventObject)
+            {
+            }
+
+            public object MyEventObject
+            {
+                get { return EventObject; }
+            }
+        }
+
+        [SupersedeEvent(typeof(TestEventArgs))]
+        public class TestEventArgs2 : CancellableObjectEventArgs
+        {
+            public TestEventArgs2(object eventObject) : base(eventObject)
+            {
+            }
+
+            public object MyEventObject
+            {
+                get { return EventObject; }
+            }
+        }
+
         public class PassiveEventDispatcher : ScopeEventDispatcherBase
         {
             public PassiveEventDispatcher()

src/Umbraco.Tests/Scoping/ScopedXmlTests.cs

@@ -179,7 +179,9 @@ namespace Umbraco.Tests.Scoping
                     scope.Complete();
             }
 
-            Assert.AreEqual(complete ? 2 : 0, evented);
+            //The reason why there is only 1 event occuring is because we are publishing twice for the same event for the same
+            //object and the scope deduplicates the events (uses the latest)
+            Assert.AreEqual(complete ? 1 : 0, evented);
 
             // this should never change
             Assert.AreEqual(beforeOuterXml, beforeXml.OuterXml);

src/Umbraco.Web/Models/Mapping/CodeFileDisplayMapper.cs

@@ -28,6 +28,7 @@ namespace Umbraco.Web.Models.Mapping
                 .ForMember(x => x.Snippet, exp => exp.Ignore());
 
             config.CreateMap<CodeFileDisplay, IPartialView>()
+                .ForMember(x => x.DeletedDate, exp => exp.Ignore())
                 .ForMember(x => x.Id, exp => exp.Ignore())
                 .ForMember(x => x.Key, exp => exp.Ignore())
                 .ForMember(x => x.Path, exp => exp.Ignore())
@@ -40,6 +41,7 @@ namespace Umbraco.Web.Models.Mapping
                 .ForMember(x => x.HasIdentity, exp => exp.Ignore());
 
             config.CreateMap<CodeFileDisplay, Script>()
+                .ForMember(x => x.DeletedDate, exp => exp.Ignore())
                 .ForMember(x => x.Id, exp => exp.Ignore())
                 .ForMember(x => x.Key, exp => exp.Ignore())
                 .ForMember(x => x.Path, exp => exp.Ignore())

src/Umbraco.Web/Models/Mapping/ContentTypeModelMapper.cs

@@ -48,6 +48,7 @@ namespace Umbraco.Web.Models.Mapping
                 .ForMember(type => type.Key, expression => expression.Ignore())
                 .ForMember(type => type.CreateDate, expression => expression.Ignore())
                 .ForMember(type => type.UpdateDate, expression => expression.Ignore())
+                .ForMember(type => type.DeletedDate, expression => expression.Ignore())
                 .ForMember(type => type.HasIdentity, expression => expression.Ignore());
 
             config.CreateMap<DocumentTypeSave, IContentType>()
@@ -72,7 +73,7 @@ namespace Umbraco.Web.Models.Mapping
             config.CreateMap<MediaTypeSave, IMediaType>()
                 //do the base mapping
                 .MapBaseContentTypeSaveToEntity<MediaTypeSave, PropertyTypeBasic, IMediaType>(applicationContext)
-                .ConstructUsing((source) => new MediaType(source.ParentId))                
+                .ConstructUsing((source) => new MediaType(source.ParentId))
                 .AfterMap((source, dest) =>
                 {
                     ContentTypeModelMapperExtensions.AfterMapMediaTypeSaveToEntity(source, dest, applicationContext);

src/Umbraco.Web/Models/Mapping/ContentTypeModelMapperExtensions.cs

@@ -31,6 +31,7 @@ namespace Umbraco.Web.Models.Mapping
                 .ForMember(dest => dest.HasIdentity, map => map.Ignore())
                 .ForMember(dest => dest.CreateDate, map => map.Ignore())
                 .ForMember(dest => dest.UpdateDate, map => map.Ignore())
+                .ForMember(dest => dest.DeletedDate, map => map.Ignore())
                 .ForMember(dest => dest.PropertyTypes, map => map.Ignore());
         }
 
@@ -175,6 +176,7 @@ namespace Umbraco.Web.Models.Mapping
                 //These get persisted as part of the saving procedure, nothing to do with the display model
                 .ForMember(dto => dto.CreateDate, expression => expression.Ignore())
                 .ForMember(dto => dto.UpdateDate, expression => expression.Ignore())
+                .ForMember(dto => dto.DeletedDate, expression => expression.Ignore())
 
                 .ForMember(dto => dto.AllowedAsRoot, expression => expression.MapFrom(display => display.AllowAsRoot))
                 .ForMember(dto => dto.CreatorId, expression => expression.Ignore())

src/Umbraco.Web/Models/Mapping/DataTypeModelMapper.cs

@@ -108,6 +108,7 @@ namespace Umbraco.Web.Models.Mapping
                 .ForMember(x => x.Level, expression => expression.Ignore())
                 .ForMember(x => x.SortOrder, expression => expression.Ignore())
                 .ForMember(x => x.CreateDate, expression => expression.Ignore())
+                .ForMember(x => x.DeletedDate, expression => expression.Ignore())
                 .ForMember(x => x.UpdateDate, expression => expression.Ignore());
 
             //Converts a property editor to a new list of pre-value fields - used when creating a new data type or changing a data type with new pre-vals

src/Umbraco.Web/Models/Mapping/MemberModelMapper.cs

@@ -55,8 +55,9 @@ namespace Umbraco.Web.Models.Mapping
                 .ForMember(member => member.SortOrder, expression => expression.Ignore())
                 .ForMember(member => member.AdditionalData, expression => expression.Ignore())
                 .ForMember(member => member.FailedPasswordAttempts, expression => expression.Ignore())
-                //TODO: Support these eventually
+                .ForMember(member => member.DeletedDate, expression => expression.Ignore())
-                .ForMember(member => member.PasswordQuestion, expression => expression.Ignore())
+                //TODO: Support these eventually
+                .ForMember(member => member.PasswordQuestion, expression => expression.Ignore())                
                 .ForMember(member => member.RawPasswordAnswerValue, expression => expression.Ignore());
 
             //FROM IMember TO MediaItemDisplay

src/Umbraco.Web/Models/Mapping/TemplateModelMapper.cs

@@ -14,6 +14,7 @@ namespace Umbraco.Web.Models.Mapping
                 .ForMember(x => x.Notifications, exp => exp.Ignore());
 
             config.CreateMap<TemplateDisplay, Template>()
+                .ForMember(x => x.DeletedDate, exp => exp.Ignore())
                 .ForMember(x => x.Key, exp => exp.Ignore())
                 .ForMember(x => x.Path, exp => exp.Ignore())
                 .ForMember(x => x.CreateDate, exp => exp.Ignore())