Question

I have magnetic card reader, It emulates Keyboard typing when user swipes card. I need to handle this keyboard typing to one string, when my WPF window is Focused. I can get this typed Key list, but I don’t know how to convert them to one string.

private void Window_KeyDown(object sender, KeyEventArgs e)
{
   list.Add(e.Key);
}

EDIT: Simple .ToString() method not helps. I’ve tried this already.

Answer 1

Rather than adding to a list why not build up the string:

private string input;

private bool shiftPressed;

private void Window_KeyDown(object sender, KeyEventArgs e)
{
    if (e.Key == Key.LeftShift || e.Key == Key.RightShift)
    {
        shiftPressed = true;
    }
    else
    {
        if (e.Key >= Key.D0 && e.Key <= Key.D9)
        {
            // Number keys pressed so need to so special processing
            // also check if shift pressed
        }
        else
        {
            input += e.Key.ToString();
        }
    }
}

private void Window_KeyUp(object sender, KeyEventArgs e)
{
    if (e.Key == Key.LeftShift || e.Key == Key.RightShift)
    {
        shiftPressed = false;
    }
}

Obviously you need to reset input to string.Empty when you start the next transaction.