TextBox Selection start, end and selected text : TextBox « Windows Presentation Foundation « C# / CSharp Tutorial

1. C# / CSharp Tutorial
2. Windows Presentation Foundation
3. TextBox

<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);
        }
    }
}

24.13.TextBox
	24.13.1.	Bind TextBlock to TextBox
	24.13.2.	Assign your own class to DataContent and bind to TextBox
	24.13.3.	TextBox: set text, select all, clear, prepend, insert, append, cut, paste, undo
	24.13.4.	Set TextBox to editable
	24.13.5.	Scroll TextBox
	24.13.6.	Use Dictionary to record which textbox has been changed and not saved
	24.13.7.	Set TextBox ContextMenu to null
	24.13.8.	TextBox Selection start, end and selected text
	24.13.9.	Scrollable TextBox Column
	24.13.10.	Check Spelling Error