How do I get a TextBox to only accept numeric input in WPF?

Question

I\'m looking to accept digits and the decimal point, but no sign.

I\'ve looked at samples using the NumericUpDown control for Windows Forms, and this sample of a Num

Answer 1

If you do not want to write a lot of code to do a basic function (I don't know why people make long methods) you can just do this:

1. Add namespace:

   using System.Text.RegularExpressions;
   

2. In XAML, set a TextChanged property:

3. In WPF under txt1_TextChanged method, add Regex.Replace:

   private void txt1_TextChanged(object sender, TextChangedEventArgs e)
   {
       txt1.Text = Regex.Replace(txt1.Text, "[^0-9]+", "");
   }