Drag and Drop on a DataGridView

 转自博客园

http://www.cnblogs.com/godwar/archive/2008/01/17/1042321.html

 

    Here is a bit of sample code that allows you to drag and drop a cellvalue in a DataGridView (don’t forget to set the AllowDrop property of the DataGridView to true). Notice that you need to translate the X and Y properties of the DragEventArgs first (unlike the X and Y properties of the MouseEventArgs):

private void dataGridView1_MouseDown ( object sender, MouseEventArgs e )
{
 DataGridView. HitTestInfo info = this. dataGridView1. HitTest ( e. X, e. Y );
  if ( info. RowIndex != -1 && info. ColumnIndex != -1 )
  {
  Object value = this. dataGridView1. Rows [info. RowIndex ]. Cells [info. ColumnIndex ]. Value;
  if (  value != null )
  {
    this. dataGridView1. Rows [info. RowIndex ]. Cells [info. ColumnIndex ]. Value = null;
    this. DoDragDrop ( value, DragDropEffects. Move );
  }
  }
}

private void dataGridView1_DragDrop ( object sender, DragEventArgs e )
{
 Point p = this. dataGridView1. PointToClient ( new Point ( e. X, e. Y ) );
 DataGridView. HitTestInfo info = this. dataGridView1. HitTest ( p. X, p. Y );
  if ( info. RowIndex != -1 && info. ColumnIndex != -1 )
  {
  Object value = ( Object )e. Data. GetData ( typeof ( string ) );
  this. dataGridView1. Rows [info. RowIndex ]. Cells [info. ColumnIndex ]. Value = value;
  }
}

private void dataGridView1_DragEnter ( object sender, DragEventArgs e )
{
 e. Effect = DragDropEffects. Move;
}

 

兩個DataGridView拖放也是一樣，只要把DragDrop、DragEnter移動到DataGridView2舊可以了，兩個DataGridView需要設定拖放True