this .PictureBoxNodeBackImage.AllowDrop = true ; // 这个也要加上
// 最后我们判断完成后怎样向PictureBox中添加数据，并从datagridview中删除选中数据所在的行，我们在PictureBox的DragDrop事件中执行操作
private void PictureBoxNodeBackImage_DragDrop( object sender, DragEventArgs e)
{Point pos = new Point(e.X, e.Y); //拖動數據后 所記錄的坐標
pos = this.PictureBoxNodeBackImage.PointToClient(pos);
int index = - 1 ;
if (e.Data.GetDataPresent( typeof ( int )))
{
index = ( int )e.Data.GetData( typeof ( int ));
}
if (index > - 1 )
MessageBox.Show(DataGridViewleizhi.Rows[index].Cells[ " Id " ].Value.ToString());
}
// 再次确定当数据拖动到PictureBox上方时，判断数据格式以及目标对象，和拖动方式.我们在PictureBox的DragEnter 事件中进行判断
private void PictureBoxNodeBackImage_DragEnter( object sender, DragEventArgs e)
{
if (e.Data.GetDataPresent( typeof ( int )))
{
e.Effect = DragDropEffects.Copy;
}
else
{
e.Effect = DragDropEffects.None;
}
}
private void DataGridViewleizhi_CellMouseDown( object sender, DataGridViewCellMouseEventArgs e)
{
DataGridViewleizhi.DoDragDrop(e.RowIndex, DragDropEffects.Copy);
}