Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.Web/UI/IPostBackDataHandler.cs

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+//------------------------------------------------------------------------------
+// <copyright file="IPostBackDataHandler.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>                                                                
+//------------------------------------------------------------------------------
+
+/*
+ * Controls that can accept postback data should implement this interface.
+ *
+ * Copyright (c) 1999 Microsoft Corporation
+ */
+namespace System.Web.UI {
+
+using System;
+using System.Collections;
+using System.Collections.Specialized;
+
+/// <devdoc>
+///    <para>Defines the contract that controls must implement in order to
+///       automatically load post back data.</para>
+/// </devdoc>
+public interface IPostBackDataHandler {
+    /*
+     * Processes the post data returned from the client for this control.
+     * Answer true if the post data causes our state to change.
+     */
+
+    /// <devdoc>
+    ///    <para>Processes the post back data for the specified control. </para>
+    ///    </devdoc>
+    bool LoadPostData(string postDataKey, NameValueCollection postCollection);
+
+    /*
+     * Notify any listeners that our state has changed as the result of
+     * a post back.
+     */
+
+    /// <devdoc>
+    ///    <para>Signals the control to notify any listeners that the state of the
+    ///       control has changed.</para>
+    /// </devdoc>
+    void RaisePostDataChangedEvent();
+}
+
+}