添加项目文件。

Dragablz/Dragablz/OrderChangedEventArgs.cs

@@ -0,0 +1,28 @@
+using System;
+
+namespace Dragablz
+{
+    public class OrderChangedEventArgs : EventArgs
+    {
+        private readonly object[] _previousOrder;
+        private readonly object[] _newOrder;
+
+        public OrderChangedEventArgs(object[] previousOrder, object[] newOrder)
+        {
+            if (newOrder == null) throw new ArgumentNullException("newOrder");
+
+            _previousOrder = previousOrder;
+            _newOrder = newOrder;
+        }
+
+        public object[] PreviousOrder
+        {
+            get { return _previousOrder; }
+        }
+
+        public object[] NewOrder
+        {
+            get { return _newOrder; }
+        }
+    }
+}