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.
Anyone have any clue how to fix this? I've got my own DataGridView class that I use, so I can easily fix this issue system-wide with a few smart event handlers I hope.
Thanks.
Since you already have the DataGridView's EditMode property set to "EditOnEnter", you can just override its OnEditingControlShowing method to make sure the drop-down list is shown as soon as a combo box receives focus:
public class myDataGridView : DataGridView
{
protected override void OnEditingControlShowing(DataGridViewEditingControlShowingEventArgs e)
{
base.OnEditingControlShowing(e);
if (e.Control is ComboBox) {
SendKeys.Send("{F4}");
}
}
}
Whenever an edit control in your DataGridView control gets the input focus, the above code checks to see if it is a combo box. If so, it virtually "presses" the F4 key, which causes the drop-down portion to expand (try it when any combo box has the focus!). It's a little bit of a hack, but it works like a charm.
I used this solution as it avoids sending keystrokes:
Override the OnCellClick method (if you're subclassing) or subscribe to the CellClick event (if you're altering the DGV from another object rather than as a subclass).
protected override void OnCellClick(DataGridViewCellEventArgs e)
{
// Normally the user would need to click a combo box cell once to
// activate it and then again to drop the list down--this is annoying for
// our purposes so let the user activate the drop-down with a single click.
if (e.ColumnIndex == this.Columns["YourDropDownColumnName"].Index
&& e.RowIndex >= 0
&& e.RowIndex <= this.Rows.Count)
{
this.CurrentCell = this[e.ColumnIndex, e.RowIndex];
this.BeginEdit(false);
ComboBox comboBox = this.EditingControl as ComboBox;
if (comboBox != null)
{
comboBox.DroppedDown = true;
}
}
base.OnCellContentClick(e);
}
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;
}
}
see: VB.NET Controls inside of a DataGridView Row on a Windows Form
To avoid the SendKeys issues, try the solution from Open dropdown(in a datagrid view) items on a single click. Essentially, in OnEditingControlShowing hook to the Enter event of the combo box, in the Enter event handler, set ComboBox.DroppedDown = true. That seems to have the same effect, but without the side effects @Cody Gray mentions.
