Numeric Data Entry in WPF

Question

How are you handling the entry of numeric values in WPF applications?

Without a NumericUpDown control, I\'ve been using a TextBox and handling its PreviewKeyDown eve

Answer 1

private void txtNumericValue_PreviewKeyDown(object sender, KeyEventArgs e)
{
    KeyConverter converter = new KeyConverter();

    string key = converter.ConvertToString(e.Key);

    if (key != null && key.Length == 1)
    {
        e.Handled = Char.IsDigit(key[0]) == false;
    }
}

This is the easiest technique I've found to accomplish this. The down side is that the context menu of the TextBox still allows non-numerics via Paste. To resolve this quickly I simply added the attribute/property: ContextMenu="{x:Null}" to the TextBox thereby disabling it. Not ideal but for my scenario it will suffice.

Obviously you could add a few more keys/chars in the test to include additional acceptable values (e.g. '.', '$' etc...)