Imported Upstream version 4.0.0~alpha1

Former-commit-id: 806294f5ded97629b74c85c09952f2a74fe182d9

external/referencesource/System.Web/Compilation/ExpressionPrefixAttribute.cs

@@ -0,0 +1,36 @@
+//------------------------------------------------------------------------------
+// <copyright file="ExpressionPrefixAttribute.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>                                                                
+//------------------------------------------------------------------------------
+
+namespace System.Web.Compilation {
+
+    using System;
+    using System.ComponentModel;
+    using System.Security.Permissions;
+
+
+    [AttributeUsage(AttributeTargets.Class, AllowMultiple=false)]
+    public sealed class ExpressionPrefixAttribute : Attribute {
+
+        private string _expressionPrefix;
+
+
+        public ExpressionPrefixAttribute(string expressionPrefix) {
+            if (String.IsNullOrEmpty(expressionPrefix)) {
+                throw new ArgumentNullException("expressionPrefix");
+            }
+
+            _expressionPrefix = expressionPrefix;
+        }
+
+
+        public string ExpressionPrefix {
+            get {
+                return _expressionPrefix;
+            }
+        }
+    }
+}
+