添加项目文件。

gong-wpf-dragdrop/src/GongSolutions.WPF.DragDrop/IDropTarget.cs

@@ -0,0 +1,34 @@
+using System.Windows;
+
+namespace GongSolutions.Wpf.DragDrop
+{
+    /// <summary>
+    /// Interface implemented by Drop Handlers.
+    /// </summary>
+    public interface IDropTarget
+    {
+        /// <summary>
+        /// Updates the current drag state.
+        /// </summary>
+        /// 
+        /// <param name="dropInfo">
+        ///   Information about the drag.
+        /// </param>
+        /// 
+        /// <remarks>
+        /// To allow a drop at the current drag position, the <see cref="DropInfo.Effects"/> property on 
+        /// <paramref name="dropInfo"/> should be set to a value other than <see cref="DragDropEffects.None"/>
+        /// and <see cref="DropInfo.Data"/> should be set to a non-null value.
+        /// </remarks>
+        void DragOver(IDropInfo dropInfo);
+
+        /// <summary>
+        /// Performs a drop.
+        /// </summary>
+        /// 
+        /// <param name="dropInfo">
+        ///   Information about the drop.
+        /// </param>
+        void Drop(IDropInfo dropInfo);
+    }
+}