How to set an entry in .net maui to only except numbers?

Here is the best solution. The previous solution has a problem with infinite looping but I was able to figure out how to correct the error!

// Method triggered by TextChanged.
private void Entry_TextChanged(object sender, TextChangedEventArgs e)
{
	// If the text field is empty or null then leave.
	string regex = e.NewTextValue;
	if (String.IsNullOrEmpty(regex))
		return;
 
	// If the text field only contains numbers then leave.
	if (!Regex.Match(regex, "^[0-9]+$").Success)
	{
		// This returns to the previous valid state.
		var entry = sender as Entry;
		entry.Text = (string.IsNullOrEmpty(e.OldTextValue))?
				string.Empty: e.OldTextValue;
	}
}

Hello,

In MAUI, you could mask the number inputting by detecting the text.

Please refer to the following sample code and documentation.

<Entry TextChanged="Entry_TextChanged"/>

private void Entry_TextChanged(object sender, TextChangedEventArgs e)
{
    //Regular expressions are used to match whether the user input contains numbers
    string result = System.Text.RegularExpressions.Regex.Replace(e.NewTextValue, @"[^0-9]+", "");
    if (Regex.Match(result, @"^[0-9]+$").Success)
    {
        var entry = sender as Entry;
        if (e.OldTextValue == null)
        {
            entry.Text = string.Empty;
        }
        else
        {
            entry.Text = e.OldTextValue;
        }

    }
}

• Create an Entry.

Best Regards,

Alec Liu.

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