CODEWITHSUNDEEP
c#winforms
Alex
Alex

Reputation: 3855

Find if KeyUp or KeyDown event was fired

I have a block of identical code for both the KeyUp and KeyDown events; the only difference is in one single line of code, which changes button.BackColor to Color.Gray or Color.White accordingly. I want to put this block of code into a separate method to avoid repetition, and the single line that is different for the two events should look like:

button.BackColor = (KeyUp was fired) ? Color.Gray : Color.White;

The method accepts KeyEventArgs e as a parameter, but I can't figure out how to determine whether e is of type KeyUp or KeyDown. In C# (winforms), is there an analog to event.type property in JavaScript? Otherwise, any other way to do this? Thanks

Upvotes: 0

Views: 191

Answers (1)

Lukazoid
Lukazoid

Reputation: 19416

There is no way from the System.Windows.Forms.KeyEventArgs to determine whether the event has been raised as the result of a KeyUp or KeyDown event. Your best bet would be to have different handling methods which both call a common method, i.e.

private void OnKeyDown(object sender, KeyEventArgs eventArgs)
{
    HandleKeyState(false, eventArgs);
}

private void OnKeyUp(object sender, KeyEventArgs eventArgs)
{
    HandleKeyState(true, eventArgs);
}

private void HandleKeyState(bool isKeyUp, KeyEventArgs eventArgs)
{
    button.BackColor = isKeyUp ? Color.Gray : Color.White;
}

Upvotes: 2

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