CODEWITHSUNDEEP
c#winformsdatagridview
sab669
sab669

Reputation: 4104

How to use the DataGridView's Keydown event and check what key was pressed?

I have this really simple block of code:

    private void dataGridView1_KeyDown(object sender, KeyEventArgs e)
    {
        if (e.KeyCode == Keys.V && e.Modifiers == Keys.Control)
            AddRow();

        if (e.KeyCode == Keys.Back && dataGridView1.SelectedRows.Count > 0)
            RemoveRow();
    }

Then when I step through my code and hit either Delete or Backspace, this is the value of e.KeyCode:

enter image description here

I know my code doesn't check for Delete but I can add that in simply afterwards.

If I cast KeyCode to a string, it gives me the value "Delete" but I shouldn't have to do that...

edit; I should note that my first block of code, for Ctrl-V works perfectly fine. So I don't understand why e.KeyCode doesn't evaluate to Keys.Delete or Keys.Backspace?

edit 2; My coworker found something that could be 100% coincidental, or extremely interesting.

KeyCode.Delete = 46. KeyCode.Space = 32 KeyCode.Back = 8 KeyCode.MButton = 4; KeyCode.RButton = 2;

32 + 8 + 4 + 2 = 46. I feel like some tinfoil hat conspiracy theorist for thinking this might be on to something, but we're completely baffled.

Upvotes: 1

Views: 2443

Answers (2)

Junaith
Junaith

Reputation: 3388

From MSDN, "This enumeration has a FlagsAttribute attribute that allows a bitwise combination of its member values"

What you see is string representation of the enum value. It uses Flags attribute to construct the string in Enum.ToString() method. See this SO question for more clarification.

Upvotes: 1

AWinkle
AWinkle

Reputation: 673

Back is the enumeration value that indicates the backspace key was pressed (MSDN-Keys Enumeration). Example code:

if (e.KeyCode.HasFlag(Keys.Back)) {
   //do stuff here
}

Upvotes: 0

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