Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.Web/Configuration/CapabilitiesUse.cs

@@ -0,0 +1,41 @@
+//------------------------------------------------------------------------------
+// <copyright file="CapabilitiesUse.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+//------------------------------------------------------------------------------
+
+namespace System.Web.Configuration {
+    
+    using System.Collections;
+    using System.Collections.Specialized;
+    using System.Diagnostics;
+    using System.Globalization;
+    using System.Reflection;
+    using System.Security;
+    using System.Text;
+    using System.Text.RegularExpressions;
+    using System.Threading;
+    using System.Web.Caching;
+    using System.Web.Compilation;
+    using System.Web.Hosting;
+    using System.Security.Permissions;
+
+    //
+    // Implementation of <use var="HTTP_ACCEPT_LANGUAGE" as="language" />: grab
+    // the server variable and stuff it into the %{language} variable
+    //
+    internal class CapabilitiesUse : CapabilitiesRule {
+        internal String _var;
+        internal String _as;
+
+        internal CapabilitiesUse(String var, String asParam) {
+            _var = var;
+            _as = asParam;
+        }
+
+        internal override void Evaluate(CapabilitiesState state) {
+            state.SetVariable(_as, state.ResolveServerVariable(_var));
+            state.Exit = false;
+        }
+    }
+}