Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.Web/UI/ControlValuePropertyAttribute.cs

@@ -0,0 +1,98 @@
+//------------------------------------------------------------------------------
+// <copyright file="ControlValuePropertyAttribute.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+//------------------------------------------------------------------------------
+
+namespace System.Web.UI {
+    using System;
+    using System.ComponentModel;
+    using System.Diagnostics;
+    using System.Security.Permissions;
+    using System.Web.Util;
+
+    /// <devdoc>
+    /// Specifies the default value property for a control.
+    /// </devdoc>
+    [AttributeUsage(AttributeTargets.Class)]
+    public sealed class ControlValuePropertyAttribute : Attribute {
+        private readonly string _name;
+        private readonly object _defaultValue;
+
+
+        /// <devdoc>
+        /// Initializes a new instance of the <see cref='System.Web.UI.ControlValuePropertyAttribute'/> class.
+        /// </devdoc>
+        public ControlValuePropertyAttribute(string name) {
+            _name = name;
+        }
+
+        /// <devdoc>
+        /// Initializes a new instance of the class, using the specified value as the default value.
+        /// </devdoc>
+        public ControlValuePropertyAttribute(string name, object defaultValue) {
+            _name = name;
+            _defaultValue = defaultValue;
+        }
+
+        /// <devdoc>
+        /// Initializes a new instance of the class, converting the specified value to the
+        /// specified type.
+        /// </devdoc>
+        public ControlValuePropertyAttribute(string name, Type type, string defaultValue) {
+            _name = name;
+            // The try/catch here is because attributes should never throw exceptions.  We would fail to
+            // load an otherwise normal class.
+            try {
+                _defaultValue = TypeDescriptor.GetConverter(type).ConvertFromInvariantString(defaultValue);
+            }
+            catch {
+                System.Diagnostics.Debug.Fail("ControlValuePropertyAttribute: Default value of type " + type.FullName + " threw converting from the string '" + defaultValue + "'.");
+            }
+        }
+
+
+        /// <devdoc>
+        /// Gets the name of the default value property for the control this attribute is bound to.
+        /// </devdoc>
+        public string Name {
+            get {
+                return _name;
+            }
+        }
+
+        /// <devdoc>
+        /// Gets the value of the default value property for the control this attribute is bound to.
+        /// </devdoc>
+        public object DefaultValue {
+            get {
+                return _defaultValue;
+            }
+        }
+
+
+
+        public override bool Equals(object obj) {
+            ControlValuePropertyAttribute other = obj as ControlValuePropertyAttribute;
+
+            if (other != null) {
+                if (String.Equals(_name, other.Name, StringComparison.Ordinal)) {
+                    if (_defaultValue != null) {
+                        return _defaultValue.Equals(other.DefaultValue);
+                    }
+                    else {
+                        return (other.DefaultValue == null);
+                    }
+                }
+            }
+            return false;
+        }
+
+
+        public override int GetHashCode() {
+            return System.Web.Util.HashCodeCombiner.CombineHashCodes(
+                ((Name != null) ? Name.GetHashCode() : 0),
+                ((DefaultValue != null) ? DefaultValue.GetHashCode() : 0));
+        }
+    }
+}