TextBox with only numbers

Question

I need to create a TextBox with only numbers but I couldn\'t do. I have tried to put : InputScope = \"Numbers\" but this only work on Mobile. Also I have tried on TextCha

Answer 1

Here is an O(1) solution without string matching

    bool textCanceled = false;

    private void TextBox_KeyDown(object sender, KeyRoutedEventArgs e)
    {
        if (!Char.IsDigit((char)e.Key))
            textCanceled = true;
        else
            textCanceled = false;

    }

    private void TextBox_BeforeTextChanging(TextBox sender, TextBoxBeforeTextChangingEventArgs args)
    {
        args.Cancel = textCanceled;
    }

might have to handle backspace char as a special case