TextBox Selection start, end and selected text


   
  

<Window x:Class="ClassicControls.TextBoxTest"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="TextBoxTest" Height="325" Width="390">
  <Grid Margin="5">
    <Grid.RowDefinitions>
      <RowDefinition Height="2*"></RowDefinition>
      <RowDefinition Height="*"></RowDefinition>
    </Grid.RowDefinitions>
    <TextBox  Name="txt" VerticalScrollBarVisibility="Auto" TextWrapping="Wrap" AcceptsReturn="True"  
             SelectionChanged="txt_SelectionChanged"  
             SpellCheck.IsEnabled="True">this is a test</TextBox>
  </Grid>
</Window>

//File:Window.xaml.cs
using System;
using System.Collections.Generic;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Shapes;

namespace ClassicControls
{
    public partial class TextBoxTest : System.Windows.Window
    {

        public TextBoxTest()
        {
            InitializeComponent();
        }

        private void txt_SelectionChanged(object sender, RoutedEventArgs e)
        {
            Console.WriteLine(txt.SelectionStart);
            Console.WriteLine(txt.SelectionLength);
            Console.WriteLine(txt.SelectedText);
        }
    }
}