4 files changed, 39 insertions, 18 deletions
diff --git a/MediaBrowser.Controller/Collections/CollectionCreatedEventArgs.cs b/MediaBrowser.Controller/Collections/CollectionCreatedEventArgs.cs
new file mode 100644
index 000000000..82b3a4977
--- /dev/null
+++ b/MediaBrowser.Controller/Collections/CollectionCreatedEventArgs.cs
@@ -0,0 +1,24 @@
+#nullable disable
+
+#pragma warning disable CS1591
+
+using System;
+using MediaBrowser.Controller.Entities.Movies;
+
+namespace MediaBrowser.Controller.Collections
+{
+    public class CollectionCreatedEventArgs : EventArgs
+    {
+        /// <summary>
+        /// Gets or sets the collection.
+        /// </summary>
+        /// <value>The collection.</value>
+        public BoxSet Collection { get; set; }
+
+        /// <summary>
+        /// Gets or sets the options.
+        /// </summary>
+        /// <value>The options.</value>
+        public CollectionCreationOptions Options { get; set; }
+    }
+}
+\ No newline at end of file
diff --git a/MediaBrowser.Controller/Collections/CollectionCreationOptions.cs b/MediaBrowser.Controller/Collections/CollectionCreationOptions.cs
index f6037d05e..30f5f4efa 100644
--- a/MediaBrowser.Controller/Collections/CollectionCreationOptions.cs
+++ b/MediaBrowser.Controller/Collections/CollectionCreationOptions.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 #pragma warning disable CS1591
 
 using System;
@@ -23,8 +25,8 @@ namespace MediaBrowser.Controller.Collections
 
         public Dictionary<string, string> ProviderIds { get; set; }
 
-        public string[] ItemIdList { get; set; }
+        public IReadOnlyList<string> ItemIdList { get; set; }
 
-        public Guid[] UserIds { get; set; }
+        public IReadOnlyList<Guid> UserIds { get; set; }
     }
 }
diff --git a/MediaBrowser.Controller/Collections/CollectionEvents.cs b/MediaBrowser.Controller/Collections/CollectionModifiedEventArgs.cs
index ce59b4ada..8155cf3db 100644
--- a/MediaBrowser.Controller/Collections/CollectionEvents.cs
+++ b/MediaBrowser.Controller/Collections/CollectionModifiedEventArgs.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 #pragma warning disable CS1591
 
 using System;
@@ -7,23 +9,14 @@ using MediaBrowser.Controller.Entities.Movies;
 
 namespace MediaBrowser.Controller.Collections
 {
-    public class CollectionCreatedEventArgs : EventArgs
-    {
-        /// <summary>
-        /// Gets or sets the collection.
-        /// </summary>
-        /// <value>The collection.</value>
-        public BoxSet Collection { get; set; }
-
-        /// <summary>
-        /// Gets or sets the options.
-        /// </summary>
-        /// <value>The options.</value>
-        public CollectionCreationOptions Options { get; set; }
-    }
-
     public class CollectionModifiedEventArgs : EventArgs
     {
+        public CollectionModifiedEventArgs(BoxSet collection, IReadOnlyCollection<BaseItem> itemsChanged)
+        {
+            Collection = collection;
+            ItemsChanged = itemsChanged;
+        }
+
         /// <summary>
         /// Gets or sets the collection.
         /// </summary>
@@ -34,6 +27,6 @@ namespace MediaBrowser.Controller.Collections
         /// Gets or sets the items changed.
         /// </summary>
         /// <value>The items changed.</value>
-        public List<BaseItem> ItemsChanged { get; set; }
+        public IReadOnlyCollection<BaseItem> ItemsChanged { get; set; }
     }
 }
diff --git a/MediaBrowser.Controller/Collections/ICollectionManager.cs b/MediaBrowser.Controller/Collections/ICollectionManager.cs
index a6991e2ea..46bc37e7f 100644
--- a/MediaBrowser.Controller/Collections/ICollectionManager.cs
+++ b/MediaBrowser.Controller/Collections/ICollectionManager.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 #pragma warning disable CS1591
 
 using System;