Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System/compmod/system/componentmodel/DisplayNameAttribute.cs

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+//------------------------------------------------------------------------------
+// <copyright file="DisplayNameAttribute.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>                                                                
+//------------------------------------------------------------------------------
+
+/*
+ */
+namespace System.ComponentModel {
+    using System;
+    using System.Diagnostics;
+    using System.Security.Permissions;
+    
+    /// <devdoc>
+    ///    <para>Specifies the display name for a property or event.  The default is the name of the property or event.</para>
+    /// </devdoc>
+    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Performance", "CA1813:AvoidUnsealedAttributes")]    
+    [AttributeUsage(AttributeTargets.Property | AttributeTargets.Event | AttributeTargets.Class | AttributeTargets.Method)]
+    public class DisplayNameAttribute : Attribute {
+        /// <devdoc>
+        /// <para>Specifies the default value for the <see cref='System.ComponentModel.DisplayNameAttribute'/> , which is an
+        ///    empty string (""). This <see langword='static'/> field is read-only.</para>
+        /// </devdoc>
+        public static readonly DisplayNameAttribute Default = new DisplayNameAttribute();
+        private string _displayName;
+
+        /// <devdoc>
+        ///    <para>[To be supplied.]</para>
+        /// </devdoc>
+        public DisplayNameAttribute() : this (string.Empty) {
+        }
+
+        /// <devdoc>
+        ///    <para>Initializes a new instance of the <see cref='System.ComponentModel.DisplayNameAttribute'/> class.</para>
+        /// </devdoc>
+        public DisplayNameAttribute(string displayName) {
+            this._displayName = displayName;
+        }
+
+        /// <devdoc>
+        ///    <para>Gets the description stored in this attribute.</para>
+        /// </devdoc>
+        public virtual string DisplayName {
+            get {
+                return DisplayNameValue;
+            }
+        }
+
+        /// <devdoc>
+        ///     Read/Write property that directly modifies the string stored
+        ///     in the description attribute. The default implementation
+        ///     of the Description property simply returns this value.
+        /// </devdoc>
+        protected string DisplayNameValue {
+            get {
+                return _displayName;
+            }
+            set {
+                _displayName = value;
+            }
+        }
+
+        public override bool Equals(object obj) {
+            if (obj == this) {
+                return true;
+            }
+
+            DisplayNameAttribute other = obj as DisplayNameAttribute;
+
+            return (other != null) && other.DisplayName == DisplayName;
+        }
+
+        public override int GetHashCode() {
+            return DisplayName.GetHashCode();
+        }
+
+        /// <internalonly/>
+        /// <devdoc>
+        /// </devdoc>
+        public override bool IsDefaultAttribute() {
+            return (this.Equals(Default));
+        }
+
+    }
+}