c#拖放

 AllowDrop

 DragEnter:

 if (e.Data.GetDataPresent(DataFormats.FileDrop))
 e.Effect = DragDropEffects.Copy;
 else e.Effect = DragDropEffects.None;

 DragDrop

             Array anyFiles = ((System.Array)e.Data.GetData(DataFormats.FileDrop));
             for(int i = ; i < anyFiles.Length; i++)
             {
                 label1.Text+= anyFiles.GetValue().ToString()+"\n";
             }