1 files changed, 59 insertions, 0 deletions

diff --git a/src/WixToolset.WixBA/PropertyNotifyBase.cs b/src/WixToolset.WixBA/PropertyNotifyBase.cs
new file mode 100644
index 00000000..03174306
--- /dev/null
+++ b/src/WixToolset.WixBA/PropertyNotifyBase.cs
@@ -0,0 +1,59 @@
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+
+namespace WixToolset.UX
+{
+    using System;
+    using System.ComponentModel;
+    using System.Diagnostics;
+
+    /// <summary>
+    /// It provides support for property change notifications.
+    /// </summary>
+    public abstract class PropertyNotifyBase : INotifyPropertyChanged
+    {
+        /// <summary>
+        /// Initializes a new instance of the <see cref="PropertyNotifyBase"/> class.
+        /// </summary>
+        protected PropertyNotifyBase()
+        {
+        }
+
+        /// <summary>
+        /// Raised when a property on this object has a new value.
+        /// </summary>
+        public event PropertyChangedEventHandler PropertyChanged;
+
+        /// <summary>
+        /// Warns the developer if this object does not have a public property with the
+        /// specified name. This method does not exist in a Release build.
+        /// </summary>
+        /// <param name="propertyName">Property name to verify.</param>
+        [Conditional("DEBUG")]
+        [DebuggerStepThrough]
+        public void VerifyPropertyName(string propertyName)
+        {
+            // Verify that the property name matches a real, public, instance property
+            // on this object.
+            if (null == TypeDescriptor.GetProperties(this)[propertyName])
+            {
+                Debug.Fail(String.Concat("Invalid property name: ", propertyName));
+            }
+        }
+
+        /// <summary>
+        /// Raises this object's PropertyChanged event.
+        /// </summary>
+        /// <param name="propertyName">The property that has a new value.</param>
+        protected virtual void OnPropertyChanged(string propertyName)
+        {
+            this.VerifyPropertyName(propertyName);
+
+            PropertyChangedEventHandler handler = this.PropertyChanged;
+            if (null != handler)
+            {
+                PropertyChangedEventArgs e = new PropertyChangedEventArgs(propertyName);
+                handler(this, e);
+            }
+        }
+    }
+}