DataGridView下拉框事件的捕获和处理

private DataGridViewComboBoxEditingControl dataGridViewComboBox = null;

//捕获事件

private void dgvTableFields_EditingControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e)
        {
            if (e.Control is DataGridViewComboBoxEditingControl && this.dgvTableFields.CurrentCell.ColumnIndex ==4
                                                                && this.dgvTableFields.CurrentCell.RowIndex !=-1)
            {               
                this.dataGridViewComboBox = (DataGridViewComboBoxEditingControl)e.Control;
              //增加委托处理

                dataGridViewComboBox.SelectionChangeCommitted += new EventHandler(this.dataGridViewComboBox_SelectionChangeCommitted);

            }
        }
        private void dataGridViewComboBox_SelectionChangeCommitted(object sender, EventArgs e)
        {

           //处理业务
            MessageBox.Show(((ComboBox)sender).Text);
        }

        private void dgvTableFields_CellEndEdit(object sender, DataGridViewCellEventArgs e)
        {
            if (this.dataGridViewComboBox != null)
            {
                dataGridViewComboBox.SelectionChangeCommitted -= new EventHandler(this.dataGridViewComboBox_SelectionChangeCommitted);
                this.dataGridViewComboBox =null;
            }
        }