Question

Say I had a ComboBox with these values:

Black
Red
Blue

And I have Red currently selected. If the user then hits backspace and hits enter I am capturing the KeyDown event of the ComboBox.

In this event I want to delete Red from the list of items in the ComboBox.

However, because the text of the ComboBox is blank by the time KeyDown is called, the SelectedIndex is -1.

Currently I have a workaround that looks like this:

private void myComboBox_SelectedIndexChanged(object sender, EventArgs e)
{
    currentMyComboBoxIndex = myComboBox.FindStringExact(myComboBox.Text);
}

Which works.. but I was just wondering if there is a better way. It seems like this way could break somehow and it seems a bit messy. Is there no way to get the current index of the ComboBox without having to keep track of it with a member variable and updating it when the index changes?

Thank you.

Answer 1

The way you are doing is fine. You have to keep the selected index in memory because it returns -1 as the SelectedIndex when the text is deleted. You could take the index in this way too.

private void myComboBox_SelectedIndexChanged(object sender, EventArgs e)
{
    currentMyComboBoxIndex = myComboBox.SelectedIndex;
}