Sleep inside KeyDown

[tholder]

It seems like you can't supress a keypress in the keydown event if there is any sort of delay?

Any idea what causes this?

[KryukovDS]

I hope I was not mistaken about the topic, and this same issue is mentioned here. I came across it when implementing key interception through SetWindowsHookEx:

[DllImport("user32.dll")]
private static extern IntPtr SetWindowsHookEx(int idHook, LowLevel_KeyboardProc Ipfn, IntPtr hMod, uint dwThreadId);

The problem is that if there is "Thread.Sleep" inside the event handler or somewhere inside its code, then after a couple of clicks the event completely stops registering. In this library, I encountered the same behavior.

private void GlobalHookKeyPress(object sender, KeyPressEventArgs e)
{
        Console.WriteLine("KeyPress: \t{0}", e.KeyChar);
        Thread.Sleep(500);
}