问DataGridViewComboBoxColumn -必须单击单元格两次才能显示组合框

EN

private void categoryDataGridView_CellClick(object sender, DataGridViewCellEventArgs e)
{
    //You can check for e.ColumnIndex to limit this to your specific column
    var editingControl = this.categoryDataGridView.EditingControl as 
        DataGridViewComboBoxEditingControl;
    if (editingControl != null)
        editingControl.DroppedDown = true;
}