Imported Upstream version 4.0.0~alpha1

Former-commit-id: 806294f5ded97629b74c85c09952f2a74fe182d9

external/referencesource/System.Web/Cache/SubstitutionResponseElement.cs

@@ -0,0 +1,42 @@
+using System;
+using System.Runtime.Serialization;
+using System.Security.Permissions;
+using System.Web;
+using System.Web.Caching;
+using System.Web.Compilation;
+
+namespace System.Web.Caching {
+    [Serializable]
+    [AspNetHostingPermission(SecurityAction.InheritanceDemand, Level = AspNetHostingPermissionLevel.Unrestricted)]
+    public class SubstitutionResponseElement: ResponseElement {
+        [NonSerialized]
+        private  HttpResponseSubstitutionCallback _callback;
+        private  string                           _targetTypeName;
+        private  string                           _methodName;
+
+        public   HttpResponseSubstitutionCallback Callback   { get { return _callback; } }
+
+        private SubstitutionResponseElement() { } // hide default constructor
+
+        public SubstitutionResponseElement(HttpResponseSubstitutionCallback callback) {
+            if (callback == null)
+                throw new ArgumentNullException("callback");
+
+            _callback = callback;
+        }
+
+        [OnSerializing()]
+        private void OnSerializingMethod(StreamingContext context) {
+            // create a string representation of the callback
+            _targetTypeName = System.Web.UI.Util.GetAssemblyQualifiedTypeName(_callback.Method.ReflectedType);
+            _methodName = _callback.Method.Name;
+        }
+
+        [OnDeserialized()]
+        private void OnDeserializedMethod(StreamingContext context) {
+            // re-create each ValidationCallbackInfo from its string representation
+            Type target = BuildManager.GetType(_targetTypeName, true /*throwOnFail*/, false /*ignoreCase*/);
+            _callback = (HttpResponseSubstitutionCallback) Delegate.CreateDelegate(typeof(HttpResponseSubstitutionCallback), target, _methodName);
+        }
+    }
+}