Imported Upstream version 4.0.0~alpha1

Former-commit-id: 806294f5ded97629b74c85c09952f2a74fe182d9

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

@@ -0,0 +1,61 @@
+//------------------------------------------------------------------------------
+// <copyright file="UrlPropertyAttribute.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>                                                                
+//------------------------------------------------------------------------------
+
+namespace System.Web.UI {
+    using System;
+    using System.ComponentModel;
+    using System.Web.Util;
+
+    // An UrlPropertyAttribute metadata attribute can be applied to string 
+    // properties that contain URL values.
+    // This can be used to identify URLs which allows design-time functionality and runtime
+    // functionality to do interesting things with the property values.
+    [AttributeUsage(AttributeTargets.Property)]
+    public sealed class UrlPropertyAttribute : Attribute {
+
+        private string _filter;
+        // Used to mark a property as an URL.
+        public UrlPropertyAttribute() : this("*.*") {
+        }
+
+        // Used to mark a property as an URL. In addition, the type of files allowed
+        // can be specified. This can be used at design-time to customize the URL picker.
+        public UrlPropertyAttribute(string filter) {
+            if(filter == null) {
+                _filter = "*.*";
+            }
+            else {
+                _filter = filter;
+            }
+        }
+
+        // The file filter associated with the URL property. This takes
+        // the form of a file filter string typically used with Open File
+        // dialogs. The default is *.*, so all file types can be chosen.
+        public string Filter {
+            get {
+                return _filter;
+            }
+        }
+
+        public override int GetHashCode() {
+            return Filter.GetHashCode();
+        }
+
+        public override bool Equals(object obj) {
+            if (obj == this) {
+                return true;
+            }
+
+            UrlPropertyAttribute other = obj as UrlPropertyAttribute;
+            if (other != null) {
+                return Filter.Equals(other.Filter);
+            }
+
+            return false;
+        }
+    }
+}