Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.Web/WebSysDescriptionAttribute.cs

@@ -0,0 +1,53 @@
+//------------------------------------------------------------------------------
+// <copyright file="WebSysDescriptionAttribute.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>                                                                
+//------------------------------------------------------------------------------
+
+/*
+ */
+namespace System.Web {
+
+
+    using System;
+    using System.ComponentModel;   
+
+
+    /// <devdoc>
+    ///     DescriptionAttribute marks a property, event, or extender with a
+    ///     description. Visual designers can display this description when referencing
+    ///     the member.
+    /// </devdoc>
+    [AttributeUsage(AttributeTargets.All)]
+    internal class WebSysDescriptionAttribute : DescriptionAttribute {
+
+        private bool replaced;
+
+
+        /// <devdoc>
+        ///    <para>Constructs a new sys description.</para>
+        /// </devdoc>
+        internal WebSysDescriptionAttribute(string description) : base(description) {
+        }
+
+
+        /// <devdoc>
+        ///    <para>Retrieves the description text.</para>
+        /// </devdoc>
+        public override string Description {
+            get {
+                if (!replaced) {
+                    replaced = true;
+                    DescriptionValue = SR.GetString(base.Description);                
+                }
+                return base.Description;
+            }
+        }
+
+        public override object TypeId {
+            get {
+                return typeof(DescriptionAttribute);
+            }
+        }
+    }
+}