Tastenschläge zählen [Übersetzung]

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        Timer timer1 = new Timer();

        [DllImport("user32.dll")]
        public static extern short GetAsyncKeyState(int vKey);
        public const int KeyPressed = -32767;
        public int Tastenschläge;
        private void Timer1_Tick(object sender, EventArgs e)
        {
            foreach (Int32 key in Enum.GetValues(System.Windows.Forms.Keys.A.GetType()))    
            {
                if (GetAsyncKeyState(key) == KeyPressed)
                {
                    Tastenschläge++;
                }
            }
        }