Question

I want to design a numeric textbox in silverlight.

I have added keydown event of TextBox to handle the keypress.

Inside event I validate the key entered in the textbox.

event as follows

  private void TextBox_KeyDown(object sender, KeyEventArgs e)
    {
        if (!this.Validate(sender,e))
            e.Handled = true;
    }

function Validate as follows

  private bool Validate(object sender, KeyEventArgs e)
    {

        if (e.Key == Key.Enter) //accept enter and tab
        {
            return true;
        }
        if (e.Key == Key.Tab)
        {
            return true;
        }

        if (e.Key < Key.D0 || e.Key > Key.D9) //accept number on alphnumeric key
            if (e.Key < Key.NumPad0 || e.Key > Key.NumPad9) //accept number fomr NumPad
                if (e.Key != Key.Back) //accept backspace
                    return false;

        return true;
    }

I am not able to detect shift and Key.D0 to Key.D1 i.e.

SHIFT + 1 which returns “!“

SHIFT + 3 returns “#” like wise any other special keys.

I dont want user to enter special character in to textbox.

How do i handle this keys event??

Answer 1

In Silverlight, I don’t think there are any Modifiers in the KeyEventArgs class but instead in Keyboard:

    public void KeyDown(KeyEventArgs e)
    {
        if (Keyboard.Modifiers == ModifierKeys.Control && e.Key == Key.D0)
        {
            ControlZero();
        }
    }