Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System/compmod/system/collections/specialized/inotifycollectionchanged.cs

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+//---------------------------------------------------------------------------
+//
+// <copyright file="INotifyCollectionChanged.cs" company="Microsoft">
+//    Copyright (C) 2003 by Microsoft Corporation.  All rights reserved.
+// </copyright>
+//
+//
+// Description: Allows collections to notify listeners of dynamic updates.
+//
+//              See spec at http://avalon/connecteddata/Specs/INotifyCollectionChanged.mht
+//
+//---------------------------------------------------------------------------
+
+using System;
+using System.Runtime.CompilerServices;
+
+namespace System.Collections.Specialized
+{
+    /// <summary>
+    /// A collection implementing this interface will notify listeners of dynamic changes,
+    /// e.g. when items get added and removed or the whole list is refreshed.
+    /// </summary>
+#if !MOBILE
+    [TypeForwardedFrom("WindowsBase, Version=3.0.0.0, Culture=Neutral, PublicKeyToken=31bf3856ad364e35")]
+#endif
+    public interface INotifyCollectionChanged
+    {
+        /// <summary>
+        /// Occurs when the collection changes, either by adding or removing an item.
+        /// </summary>
+        /// <remarks>
+        /// The event handler receives an argument of type
+        /// <seealso cref="System.Collections.Specialized.NotifyCollectionChangedEventArgs" />
+        /// containing data related to this event.
+        /// </remarks>
+        event NotifyCollectionChangedEventHandler CollectionChanged;
+    }
+}
+
+