Centralized getting an IPublishedContent item from a Udi in a single extension method so that we're not repeating that code all over the place all the time

src/Umbraco.Web/Extensions/UdiExtensions.cs

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+using Umbraco.Core;
+using Umbraco.Core.Models;
+
+namespace Umbraco.Web.Extensions
+{
+    public static class UdiExtensions
+    {
+        /// <summary>
+        /// An extension method to easily acquire a typed version of content, media or member item for a given Udi
+        /// </summary>
+        /// <param name="udi"></param>
+        /// <returns>An <see cref="IPublishedContent"/> item if the item is a Document, Media or Member</returns>
+        public static IPublishedContent ToPublishedContent(this Udi udi)
+        {
+            Udi identifier;
+            if (Udi.TryParse(udi.ToString(), out identifier) == false)
+                return null;
+
+            var guidUdi = GuidUdi.Parse(udi.ToString());
+            var umbracoType = Constants.UdiEntityType.ToUmbracoObjectType(identifier.EntityType);
+
+            var umbracoHelper = new UmbracoHelper(UmbracoContext.Current);
+            var entityService = ApplicationContext.Current.Services.EntityService;
+            switch (umbracoType)
+            {
+                case UmbracoObjectTypes.Document:
+                    return umbracoHelper.TypedContent(guidUdi.Guid);
+                case UmbracoObjectTypes.Media:
+                    var mediaAttempt = entityService.GetIdForKey(guidUdi.Guid, umbracoType);
+                    if (mediaAttempt.Success)
+                        return umbracoHelper.TypedMedia(mediaAttempt.Result);
+                    break;
+                case UmbracoObjectTypes.Member:
+                    var memberAttempt = entityService.GetIdForKey(guidUdi.Guid, umbracoType);
+                    if (memberAttempt.Success)
+                        return umbracoHelper.TypedMember(memberAttempt.Result);
+                    break;
+            }
+            
+            return null;
+        }
+    }
+}