Removed ICancellableObjectEventArgs and instead just have a base class without the strongly typed object...

CancellableEventArgs.

src/Umbraco.Core/Events/CancellableEventArgs.cs

@@ -0,0 +1,51 @@
+using System;
+using System.Security.Permissions;
+
+namespace Umbraco.Core.Events
+{
+	/// <summary>
+	/// Event args for that can support cancellation
+	/// </summary>
+	[HostProtection(SecurityAction.LinkDemand, SharedState = true)]
+	public class CancellableEventArgs : EventArgs
+	{
+		private bool _cancel;
+
+		public CancellableEventArgs(bool canCancel)
+		{
+			CanCancel = canCancel;
+		}
+
+		public CancellableEventArgs()
+			: this(true)
+		{
+		}
+		/// <summary>
+		/// Flag to determine if this instance will support being cancellable
+		/// </summary>
+		public bool CanCancel { get; set; }
+
+		/// <summary>
+		/// If this instance supports cancellation, this gets/sets the cancel value
+		/// </summary>
+		public bool Cancel
+		{
+			get
+			{
+				if (!CanCancel)
+				{
+					throw new InvalidOperationException("This event argument class does not support cancelling.");
+				}
+				return _cancel;
+			}
+			set
+			{
+				if (!CanCancel)
+				{
+					throw new InvalidOperationException("This event argument class does not support cancelling.");
+				}
+				_cancel = value;
+			}
+		}
+	}
+}

src/Umbraco.Core/Events/CancellableObjectEventArgs.cs

@@ -1,4 +1,3 @@
-using System;
 using System.Security.Permissions;
 using Umbraco.Core.Models;
 using Umbraco.Core.Models.EntityBase;
@@ -10,14 +9,13 @@ namespace Umbraco.Core.Events
 	/// </summary>
 	/// <typeparam name="T"></typeparam>
 	[HostProtection(SecurityAction.LinkDemand, SharedState = true)]
-	public class CancellableObjectEventArgs<T> : EventArgs, ICancellableObjectEventArgs
+	public class CancellableObjectEventArgs<T> : CancellableEventArgs
 	{
-		private bool _cancel;
 
 		public CancellableObjectEventArgs(T entity, bool canCancel)
+			: base(canCancel)
 		{
 			Entity = entity;
-			CanCancel = canCancel;
 		}
 
 		public CancellableObjectEventArgs(T entity)
@@ -25,33 +23,6 @@ namespace Umbraco.Core.Events
 		{
 		}
 
-		/// <summary>
-		/// Flag to determine if this instance will support being cancellable
-		/// </summary>
-		public bool CanCancel { get; set; }
-
-		/// <summary>
-		/// If this instance supports cancellation, this gets/sets the cancel value
-		/// </summary>
-		public bool Cancel
-		{
-			get
-			{
-				if (!CanCancel)
-				{
-					throw new InvalidOperationException("This event argument class does not support cancelling.");
-				}
-				return _cancel;
-			}
-			set
-			{
-				if (!CanCancel)
-				{
-					throw new InvalidOperationException("This event argument class does not support cancelling.");
-				}
-				_cancel = value;
-			}
-		}
 
 		public T Entity { get; private set; }
 

src/Umbraco.Core/Events/EventExtensions.cs

@@ -20,7 +20,7 @@ namespace Umbraco.Core.Events
 			this TypedEventHandler<TSender, TArgs> eventHandler,
 			TArgs args,
 			TSender sender)
-			where TArgs : ICancellableObjectEventArgs
+			where TArgs : CancellableEventArgs
 		{
 			if (eventHandler != null)
 				eventHandler(sender, args);

src/Umbraco.Core/Events/ICancellableObjectEventArgs.cs

@@ -1,18 +0,0 @@
-namespace Umbraco.Core.Events
-{
-	/// <summary>
-	/// Interface for EventArgs clases to implement when they support cancelling operations
-	/// </summary>
-	public interface ICancellableObjectEventArgs
-	{
-		/// <summary>
-		/// If this instance supports cancellation, this gets/sets the cancel value
-		/// </summary>
-		bool Cancel { get; set; }
-
-		/// <summary>
-		/// Flag to determine if this instance will support being cancellable
-		/// </summary>
-		bool CanCancel { get; set; }
-	}
-}

src/Umbraco.Core/Umbraco.Core.csproj

@@ -117,12 +117,12 @@
     <Compile Include="Dictionary\CultureDictionaryFactoryResolver.cs" />
     <Compile Include="Dictionary\ICultureDictionaryFactory.cs" />
     <Compile Include="Dynamics\DynamicInstanceHelper.cs" />
+    <Compile Include="Events\CancellableEventArgs.cs" />
     <Compile Include="Events\ContentCacheEventArgs.cs" />
     <Compile Include="Events\CopyEventArgs.cs" />
     <Compile Include="Events\DeleteEventArgs.cs" />
     <Compile Include="Events\CancellableObjectEventArgs.cs" />
     <Compile Include="Events\EventExtensions.cs" />
-    <Compile Include="Events\ICancellableObjectEventArgs.cs" />
     <Compile Include="Events\TypedEventHandler.cs" />
     <Compile Include="Events\PublishingEventArgs.cs" />
     <Compile Include="Events\MoveEventArgs.cs" />