number formatting - Avalonia: Get Numeric UpDown to parse the text on lost focus - Stack Overflow

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I have a numeric up down like this:

<NumericUpDown Value="{Binding Samples}" ShowButtonSpinner="False" ParsingNumberStyle="Integer"/>

Then I use this on the MainWindow.axaml.cs:

protected override void OnKeyDown(KeyEventArgs e)
{
    base.OnKeyDown(e);
    if (e.Key == Key.Enter) // includes Key.Return
            Focus();
}

This makes the Input lose focus when the Return key is pressed.
if I type '100' into the field and press return, it accepts the value, like I would expect. if I type '100.0' or any invalid string the field does not loose focus when pressing return. In this case I'd like the input to be reset to whatever it was before the user started typing.
Do I need to write my own validator and call it while the user is typing?

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