Imported Upstream version 4.0.0~alpha1

Former-commit-id: 806294f5ded97629b74c85c09952f2a74fe182d9

external/referencesource/System.Web/Hosting/ContextBase.cs

@@ -0,0 +1,36 @@
+//------------------------------------------------------------------------------
+// <copyright file="ApplicatonManager.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>                                                                
+//------------------------------------------------------------------------------
+
+namespace System.Web.Hosting {
+
+    using System.Web;
+    using System.Web.Configuration;
+    using System.Runtime.Remoting.Messaging;
+    using System.Security.Permissions;
+    
+    internal class ContextBase {
+
+        internal static Object Current {
+            get {
+                return CallContext.HostContext;
+            }
+
+            [SecurityPermission(SecurityAction.Demand, Unrestricted = true)]
+            set {
+                CallContext.HostContext = value;
+            }
+        }
+
+        // static methods
+
+        internal static Object SwitchContext(Object newContext) {
+            Object oldContext = CallContext.HostContext;
+            if (oldContext != newContext)
+                CallContext.HostContext = newContext;
+            return oldContext;
+        }
+    }
+}