TextBox/NumberBox Filtering WINUI3

Question

Is it possible to implement an TextBox/NumberBox that filters and only accepts numeric values in real time just like what a NumberBox normaly does but not just when the user completes the input and if so how can I do it?

score 1 · Answer 1 · answered Jun 24 '21 at 12:32

1

The general approach would be to handle the BeforeTextChanging event:

private void TextBox_BeforeTextChanging(TextBox sender, TextBoxBeforeTextChangingEventArgs e)
{
    if (!string.IsNullOrEmpty(e.NewText))
        foreach (char c in e.NewText)
            if (!char.IsDigit(c))
            {
                e.Cancel = true;
                return;
            }
}

XAML:

<TextBox BeforeTextChanging="TextBox_BeforeTextChanging" />

answered Jun 24 '21 at 12:32

mm8

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The property BeforeTextChanging doesn't exist. – David Simões Jun 28 '21 at 09:56
I's not a property. It's an event and it does exist: https://learn.microsoft.com/en-us/uwp/api/windows.ui.xaml.controls.textbox.beforetextchanging?WT.mc_id=WD-MVP-5001077 – mm8 Jun 28 '21 at 12:52
This works in WinUI3 – Shiva N Nov 14 '22 at 13:44

TextBox/NumberBox Filtering WINUI3

1 Answers1