DataGridView中DataGridViewComDaboBoxColumn控件点击一次即可显示下拉菜单

        private void dataGridView1_CellClick(object sender, DataGridViewCellEventArgs e)
        {
            if (e.ColumnIndex >= 0 && e.RowIndex >= 0 && dataGridView1[e.ColumnIndex, e.RowIndex] != null && !dataGridView1[e.ColumnIndex, e.RowIndex].ReadOnly)
            {
                DataGridViewComboBoxColumn comboboxcolum = dataGridView1.Columns[e.ColumnIndex] as DataGridViewComboBoxColumn;
                if (comboboxcolum != null)
                {
                    this.dataGridView1.CurrentCell = dataGridView1[e.ColumnIndex, e.RowIndex];
                    dataGridView1.BeginEdit(true);
                    DataGridViewComboBoxEditingControl comboboxeditingcontrol = dataGridView1.EditingControl as DataGridViewComboBoxEditingControl;
                    if (comboboxeditingcontrol != null)
                    {
                        comboboxeditingcontrol.DroppedDown = true;
                    }
                }
            }
        }

针对DataGridViewComDaboBoxColumn控件需要点击多次才可以显示下拉框进行修改。