How do I get DataGridView comboboxes to display their drop down list in one click?

Question

After I set \"EditOnEnter\" to be true, the DataGridViewComboBoxCell still takes two clicks to open if I don\'t click on the down arrow part of the combo box.

Answer 1

    protected override void OnEditingControlShowing(DataGridViewEditingControlShowingEventArgs e)
    {
        base.OnEditingControlShowing(e);
        DataGridViewComboBoxEditingControl dataGridViewComboBoxEditingControl = e.Control as DataGridViewComboBoxEditingControl;
        if (dataGridViewComboBoxEditingControl != null)
        {
            dataGridViewComboBoxEditingControl.GotFocus += this.DataGridViewComboBoxEditingControl_GotFocus;
            dataGridViewComboBoxEditingControl.Disposed += this.DataGridViewComboBoxEditingControl_Disposed;
        }
    }

    private void DataGridViewComboBoxEditingControl_GotFocus(object sender, EventArgs e)
    {
        ComboBox comboBox = sender as ComboBox;
        if (comboBox != null)
        {
            if (!comboBox.DroppedDown)
            {
                comboBox.DroppedDown = true;
            }
        }
    }

    private void DataGridViewComboBoxEditingControl_Disposed(object sender, EventArgs e)
    {
        Control control = sender as Control;
        if (control != null)
        {
            control.GotFocus -= this.DataGridViewComboBoxEditingControl_GotFocus;
            control.Disposed -= this.DataGridViewComboBoxEditingControl_Disposed;
        }
    }