Add dashes when user is entering ssn in a text box.unable to delete hyphons using delete\backbutton

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Hi I have a XAML requirement to add dashes when user is entering ssn in a text box. I tried below code, am able to add dashes, but unable to delete dashes from text box. Whenever i try to delete or use back space hyphens are not deleted

What I have tried:

XAML:

XML

<Window x:Class="WpfApplication2.MainWindow"                  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="MainWindow" Height="350" Width="525">
    <grid>
    <TextBox HorizontalAlignment="Left" Height="23"                    Margin="10,10,0,0"
    TextWrapping="Wrap" Name="Txtssn"
    Text=""
                                 MaxLength="11"
                                 VerticalAlignment="Top"
                                 Width="120"
                                 TextChanged="TextBox_TextChanged"/>

C#:

C#

using System.Windows;
using System.Windows.Controls;

namespace WpfApplication2
{
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        private void TextBox_TextChanged(object sender, TextChangedEventArgs e)
        {
            var textBox = sender as TextBox;

            string data = textBox.Text;

            if (data.Length == 3)
            {
                string formattedSSN = data.Insert(3, "-");
                Txtssn.Text = formattedSSN.ToString();
                textBox.Focus();
                textBox.SelectionStart = textBox.Text.Length;
            }
            else if (data.Length == 6)
            {
                string formattedSSN = data.Insert(6, "-");
                Txtssn.Text = formattedSSN.ToString();
                textBox.Focus();
                textBox.SelectionStart = textBox.Text.Length;
}}}

Posted 29-Apr-18 14:28pm

Member 11381933

Updated 29-Apr-18 16:50pm

Wendelius

v3

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Wendelius · Answer 1 · 2018-04-29T16:52:00

In order to correctly add or remove the hyphen you should handle for example UIElement.KeyDown Event (System.Windows)[^] . In the event handler, check if the user is adding text or removing it (backspace pressed). Also you need to take into consideration if delete key is pressed and/or if an area of text is selected and the caret position in the text.

There are quite a few example, like How To Implement a Mask for a Text Box in W.P.F.[^]. However, perhaps the easiest way would be to use a ready made control from Extended WPF Toolkit™[^]