Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.Web.Extensions/ui/PostBackTrigger.cs

@@ -0,0 +1,82 @@
+//------------------------------------------------------------------------------
+// <copyright file="PostBackTrigger.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+//------------------------------------------------------------------------------
+ 
+namespace System.Web.UI {
+    using System;
+    using System.ComponentModel;
+    using System.Diagnostics.CodeAnalysis;
+    using System.Globalization;
+    using System.Web;
+    using System.Web.UI;
+    using System.Web.Resources;
+    using System.Web.Util;
+
+    public class PostBackTrigger : UpdatePanelControlTrigger {
+
+        private IScriptManagerInternal _scriptManager;
+
+        public PostBackTrigger() {
+        }
+
+        internal PostBackTrigger(IScriptManagerInternal scriptManager) {
+            _scriptManager = scriptManager;
+        }
+
+        [
+        SuppressMessage("Microsoft.Naming", "CA1709:IdentifiersShouldBeCasedCorrectly", MessageId = "ID"),
+        TypeConverter("System.Web.UI.Design.PostBackTriggerControlIDConverter, " +
+            AssemblyRef.SystemWebExtensionsDesign)
+        ]
+        public new string ControlID {
+            get {
+                return base.ControlID;
+            }
+            set {
+                base.ControlID = value;
+            }
+        }
+
+        internal IScriptManagerInternal ScriptManager {
+            get {
+                if (_scriptManager == null) {
+                    Page page = Owner.Page;
+                    if (page == null) {
+                        throw new InvalidOperationException(AtlasWeb.Common_PageCannotBeNull);
+                    }
+                    _scriptManager = UI.ScriptManager.GetCurrent(page);
+                    if (_scriptManager == null) {
+                        throw new InvalidOperationException(String.Format(CultureInfo.InvariantCulture, AtlasWeb.Common_ScriptManagerRequired, Owner.ID));
+                    }
+                }
+                return _scriptManager;
+            }
+        }
+
+        protected internal override void Initialize() {
+            base.Initialize();
+
+            Control associatedControl = FindTargetControl(false);
+
+            ScriptManager.RegisterPostBackControl(associatedControl);
+        }
+
+        protected internal override bool HasTriggered() {
+            // This type of trigger never triggers since it causes a regular postback,
+            // where all UpdatePanels render anyway.
+            return false;
+        }
+
+        [SuppressMessage("Microsoft.Security", "CA2123:OverrideLinkDemandsShouldBeIdenticalToBase")]
+        public override string ToString() {
+            if (String.IsNullOrEmpty(ControlID)) {
+                return "PostBack";
+            }
+            else {
+                return "PostBack: " + ControlID;
+            }
+        }
+    }
+}