Imported Upstream version 4.0.0~alpha1

Former-commit-id: 806294f5ded97629b74c85c09952f2a74fe182d9

external/referencesource/System/compmod/system/componentmodel/PropertyChangingEventArgs.cs

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+//------------------------------------------------------------------------------
+// <copyright file="PropertyChangingEventArgs.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>Provides data for the <see langword='PropertyChanging'/>
+    /// event.</para>
+    /// </devdoc>
+#if !SILVERLIGHT
+    [HostProtection(SharedState = true)]
+#endif
+    public class PropertyChangingEventArgs : EventArgs {
+        private readonly string propertyName;
+
+        /// <devdoc>
+        /// <para>Initializes a new instance of the <see cref='System.ComponentModel.PropertyChangingEventArgs'/>
+        /// class.</para>
+        /// </devdoc>
+        public PropertyChangingEventArgs(string propertyName) {
+            this.propertyName = propertyName;
+        }
+
+        /// <devdoc>
+        ///    <para>Indicates the name of the property that is changing.</para>
+        /// </devdoc>
+        public virtual string PropertyName {
+            get {
+                return propertyName;
+            }
+        }
+    }
+}