Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

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

@@ -0,0 +1,90 @@
+//------------------------------------------------------------------------------
+// <copyright file="DesignOnlyAttribute.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 whether a property can only be set at
+    ///       design time.</para>
+    /// </devdoc>
+    [AttributeUsage(AttributeTargets.All)]
+    public sealed class DesignOnlyAttribute : Attribute {
+        private bool isDesignOnly = false;
+
+        /// <devdoc>
+        ///    <para>
+        ///       Initializes a new instance of the <see cref='System.ComponentModel.DesignOnlyAttribute'/> class.
+        ///    </para>
+        /// </devdoc>
+        public DesignOnlyAttribute(bool isDesignOnly) {
+            this.isDesignOnly = isDesignOnly;
+        }
+
+        /// <devdoc>
+        ///    <para>
+        ///       Gets a value indicating whether a property
+        ///       can be set only at design time.
+        ///    </para>
+        /// </devdoc>
+        public bool IsDesignOnly {
+            get {
+                return isDesignOnly;
+            }
+        }
+
+        /// <devdoc>
+        ///    <para>
+        ///       Specifies that a property can be set only at design time. This
+        ///    <see langword='static '/>field is read-only. 
+        ///    </para>
+        /// </devdoc>
+        public static readonly DesignOnlyAttribute Yes = new DesignOnlyAttribute(true);
+
+        /// <devdoc>
+        ///    <para>
+        ///       Specifies
+        ///       that a
+        ///       property can be set at design time or at run
+        ///       time. This <see langword='static '/>field is read-only.
+        ///    </para>
+        /// </devdoc>
+        public static readonly DesignOnlyAttribute No = new DesignOnlyAttribute(false);
+
+        /// <devdoc>
+        ///    <para>
+        ///       Specifies the default value for the <see cref='System.ComponentModel.DesignOnlyAttribute'/>, which is <see cref='System.ComponentModel.DesignOnlyAttribute.No'/>. This <see langword='static'/> field is
+        ///       read-only.
+        ///    </para>
+        /// </devdoc>
+        public static readonly DesignOnlyAttribute Default = No;
+
+        /// <devdoc>
+        /// </devdoc>
+        /// <internalonly/>
+        public override bool IsDefaultAttribute() {
+            return IsDesignOnly == Default.IsDesignOnly;
+        }
+
+        public override bool Equals(object obj) {
+            if (obj == this) {
+                return true;
+            }
+
+            DesignOnlyAttribute other = obj as DesignOnlyAttribute;
+
+            return (other != null) && other.isDesignOnly == isDesignOnly;
+        }
+
+        public override int GetHashCode() {
+            return isDesignOnly.GetHashCode();
+        }
+    }
+}