Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

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

@@ -0,0 +1,58 @@
+//------------------------------------------------------------------------------
+// <copyright file="DataObjectAttribute.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>                                                                
+//------------------------------------------------------------------------------
+
+namespace System.ComponentModel {
+
+    using System;
+    using System.Security.Permissions;
+
+    /// <devdoc>
+    /// </devdoc>
+    [AttributeUsage(AttributeTargets.Class)]
+    public sealed class DataObjectAttribute : Attribute {
+
+        public static readonly DataObjectAttribute DataObject = new DataObjectAttribute(true);
+
+        public static readonly DataObjectAttribute NonDataObject = new DataObjectAttribute(false);
+
+        public static readonly DataObjectAttribute Default = NonDataObject;
+
+        private bool _isDataObject;
+
+        public DataObjectAttribute() : this(true) {
+        }
+
+        public DataObjectAttribute(bool isDataObject) {
+            _isDataObject = isDataObject;
+        }
+
+        public bool IsDataObject {
+            get {
+                return _isDataObject;
+            }
+        }
+
+        /// <internalonly/>
+        public override bool Equals(object obj) {
+            if (obj == this) {
+                return true;
+            }
+
+            DataObjectAttribute other = obj as DataObjectAttribute;
+            return (other != null) && (other.IsDataObject == IsDataObject);
+        }
+
+        /// <internalonly/>
+        public override int GetHashCode() {
+            return _isDataObject.GetHashCode();
+        }
+
+        /// <internalonly/>
+        public override bool IsDefaultAttribute() {
+            return (this.Equals(Default));
+        }
+    }
+}