回顾上篇文章：C# WPF：把文件给我拖进来！！！
This article completes the corresponding following: "C#WPF: Drag the file out this time!"
Check the effect in advance:
上面效果的代码很少，xaml 中只注册事件PreviewMouseLeftButtonDown即可：
<Grid MouseMove="Grid_MouseMove" AllowDrop="True" Drop="Grid_Drop" DragEnter="Grid_DragEnter" PreviewMouseLeftButtonDown="Grid_PreviewMouseLeftButtonDown">
The event handling code is as follows:
//处理文件拽出操作
private void Grid_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
// 目前每个菜单由一个Image和TextBlock组成，所以判断拖拽的是否是一个Image控件，其他目标控件的拖拽不处理
var img = e.OriginalSource as Image;
if (img == null || img.Tag == null)
{
return;
}
var menuInfo = img.Tag as MenuItemInfo;
if(menuInfo==null)
{
return;
}
#region 拖拽代码
ListView lv = new ListView();
string dataFormat = DataFormats.FileDrop;
DataObject dataObject = new DataObject(dataFormat, new string[] { menuInfo.FilePath});
DragDropEffects dde = DragDrop.DoDragDrop(lv, dataObject, DragDropEffects.Copy);
#endregion
}
关键的是后面的代码(拖拽代码，源码仓库路径)，需要将原文件路径通过DragDrop.DoDragDrop方法传入，操作系统帮我们处理了文件复制操作。
The above operation is still too simple. It is equivalent to just copying files at the operating system level. If you want to complete a drag-and-drop download function similar to Baidu's network disk (as shown below):
上面的功能，程序其实要做不少事情，需要监听拖放的路径，得到拖放路径后，就可以通过原文件网络路径进行下载了，建议阅读这篇文章，参考拖放下载文件操作：WPF 拖拽文件(拖入拖出)，监控拖拽到哪个位置，类似百度网盘拖拽。
另外，这篇文章对 WPF 的拖放写得也不做，建议阅读：WPF 之 DragDrop 拖放实例。