Question

I was trying to test whether the Alt key was pressed.

I had a check similar to:

private void ProcessCmdKey(Keys keyData)
{
 if (keyData == Keys.Alt)
 {
  System.Console.WriteLine ("Alt Key Pressed");
 } 
}

Anyways needless to say when I breakpointed when I had pressed the Alt key the debugger told me the key that was pressed was actually Keys.RButton | Keys.ShiftKey | Keys.Alt

Can anyone shed some light on what is going on or perhaps point me to an article that can explain?

Thanks
FZ

Edit:
I am still a bit lost as to why the ENUM would have have other bit values set and not simply the Alt key? I understand that the enum can include more than 1 state with the flags attrivbute but I am not sure why it does if all I pressed was Alt?

Answer 1

If you want to test whether Alt is part of the pressed keys, you can perform a bitwise test;

if((keyData & Keys.Alt) == Keys.Alt) {...}