Imported Upstream version 4.0.0~alpha1

Former-commit-id: 806294f5ded97629b74c85c09952f2a74fe182d9

external/referencesource/System.Web/UI/PageStatePersister.cs

@@ -0,0 +1,72 @@
+//------------------------------------------------------------------------------
+// <copyright file="PageStatePersister.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>                                                                
+//------------------------------------------------------------------------------
+
+namespace System.Web.UI {
+    using System.Collections;
+
+    public abstract class PageStatePersister {
+        
+        private Page _page;
+        private object _viewState;
+        private object _controlState;
+        private IStateFormatter2 _stateFormatter;
+
+        protected PageStatePersister (Page page) {
+            if (page == null) {
+                throw new ArgumentNullException("page", SR.GetString(SR.PageStatePersister_PageCannotBeNull));
+            }
+            _page = page;
+        }
+
+        public object ControlState {
+            get {
+                return _controlState;
+            }
+            set {
+                _controlState = value;
+            }
+        }
+
+        /// <devdoc>
+        /// Provides the formatter used to serialize and deserialize the object graph representing the
+        /// state to be persisted.
+        /// </devdoc>
+        protected IStateFormatter StateFormatter {
+            get { return StateFormatter2; }
+        }
+
+        internal IStateFormatter2 StateFormatter2 {
+            get {
+                if (_stateFormatter == null) {
+                    _stateFormatter = Page.CreateStateFormatter();
+                }
+                return _stateFormatter;
+            }
+        }
+
+        protected Page Page {
+            get {
+                return _page;
+            }
+            set {
+                _page = value;
+            }
+        }
+
+        public object ViewState {
+            get {
+                return _viewState;
+            }
+            set {
+                _viewState = value;
+            }
+        }
+        
+        public abstract void Load();
+        
+        public abstract void Save();
+    }
+}