1 files changed, 44 insertions, 17 deletions

diff --git a/MediaBrowser.Controller/Entities/BaseItemExtensions.cs b/MediaBrowser.Controller/Entities/BaseItemExtensions.cs
index 9c955a724..33870e2fb 100644
--- a/MediaBrowser.Controller/Entities/BaseItemExtensions.cs
+++ b/MediaBrowser.Controller/Entities/BaseItemExtensions.cs
@@ -1,3 +1,6 @@
+#pragma warning disable CS1591
+
+using System;
 using System.Linq;
 using MediaBrowser.Model.Entities;
 using MediaBrowser.Model.IO;
@@ -41,9 +44,10 @@ namespace MediaBrowser.Controller.Entities
         /// <param name="file">The file.</param>
         public static void SetImagePath(this BaseItem item, ImageType imageType, string file)
         {
-            if (file.StartsWith("http", System.StringComparison.OrdinalIgnoreCase))
+            if (file.StartsWith("http", StringComparison.OrdinalIgnoreCase))
             {
-                item.SetImage(new ItemImageInfo
+                item.SetImage(
+                new ItemImageInfo
                 {
                     Path = file,
                     Type = imageType
@@ -60,40 +64,63 @@ namespace MediaBrowser.Controller.Entities
         /// </summary>
         /// <param name="source">The source object.</param>
         /// <param name="dest">The destination object.</param>
+        /// <typeparam name="T">Source type.</typeparam>
+        /// <typeparam name="TU">Destination type.</typeparam>
         public static void DeepCopy<T, TU>(this T source, TU dest)
-        where T : BaseItem
-        where TU : BaseItem
+            where T : BaseItem
+            where TU : BaseItem
         {
-            var sourceProps = typeof(T).GetProperties().Where(x => x.CanRead).ToList();
-            var destProps = typeof(TU).GetProperties()
-                    .Where(x => x.CanWrite)
-                    .ToList();
+            if (source == null)
+            {
+                throw new ArgumentNullException(nameof(source));
+            }
+
+            if (dest == null)
+            {
+                throw new ArgumentNullException(nameof(dest));
+            }
 
-            foreach (var sourceProp in sourceProps)
+            var destProps = typeof(TU).GetProperties().Where(x => x.CanWrite).ToList();
+
+            foreach (var sourceProp in typeof(T).GetProperties())
             {
-                if (destProps.Any(x => x.Name == sourceProp.Name))
+                // We should be able to write to the property
+                // for both the source and destination type
+                // This is only false when the derived type hides the base member
+                // (which we shouldn't copy anyway)
+                if (!sourceProp.CanRead || !sourceProp.CanWrite)
                 {
-                    var p = destProps.First(x => x.Name == sourceProp.Name);
-                    p.SetValue(dest, sourceProp.GetValue(source, null), null);
+                    continue;
                 }
 
-            }
+                var v = sourceProp.GetValue(source);
+                if (v == null)
+                {
+                    continue;
+                }
 
+                var p = destProps.Find(x => x.Name == sourceProp.Name);
+                if (p != null)
+                {
+                    p.SetValue(dest, v);
+                }
+            }
         }
 
         /// <summary>
         /// Copies all properties on newly created object. Skips properties that do not exist.
         /// </summary>
         /// <param name="source">The source object.</param>
+        /// <typeparam name="T">Source type.</typeparam>
+        /// <typeparam name="TU">Destination type.</typeparam>
+        /// <returns>Destination object.</returns>
         public static TU DeepCopy<T, TU>(this T source)
-        where T : BaseItem
-        where TU : BaseItem, new()
+            where T : BaseItem
+            where TU : BaseItem, new()
         {
             var dest = new TU();
             source.DeepCopy(dest);
             return dest;
         }
-
-
     }
 }