Question

So my goal is once a user clicks on the item from the dropdown list, the cell will automatically call EndEdit(). The weirdest thing is that the code below will work on the 2nd-n ComboBoxesCells that I drop down and select values from but NEVER the first one. Is there something I’m missing here??

        protected override void OnCellClick(DataGridViewCellEventArgs e)
        {
            base.OnCellClick(e);

            DataGridViewComboBoxEditingControl control = this.EditingControl as DataGridViewComboBoxEditingControl;
            if (control != null)
            {
                   control.DropDownClosed += new EventHandler(control_DropDownClosed);
            }
        }

            void control_DropDownClosed(object sender, EventArgs e)
            {
                this.EndEdit();
                DataGridViewComboBoxEditingControl control = sender as DataGridViewComboBoxEditingControl;
                control.DropDownClosed -= new EventHandler(control_DropDownClosed);
            }

Should add here that I am inheriting from DataGridView if that’s not obvious

Answer 1

When something like “The weirdest thing is that the code below will work on the 2nd-n ComboBoxesCells that I drop down and select values from but NEVER the first one” happens, it’s often because the Event happens before something you need is done.

Seing your example, I would say that the first time, when you click,

DataGridViewComboBoxEditingControl control = this.EditingControl as DataGridViewComboBoxEditingControl;

gives you control == null.

Maybe you should change the Event chosen to do your stuff from Click to SelectedIndexChanged or SelectedValueChanged ?

Hope this helps,