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.vb
Imports System
Imports System.Collections.Generic
Imports System.Text
Imports System.Windows
Imports System.Windows.Controls
Imports System.Windows.Data
Imports System.Windows.Documents
Imports System.Windows.Input
Imports System.Windows.Media
Imports System.Windows.Media.Imaging
Imports System.Windows.Shapes

Namespace ClassicControls
  Public Partial Class TextBoxTest
    Inherits System.Windows.Window

    Public Sub New()
      InitializeComponent()
    End Sub

    Private Sub txt_SelectionChanged(sender As Object, e As RoutedEventArgs)
      Console.WriteLine(txt.SelectionStart)
      Console.WriteLine(txt.SelectionLength)
      Console.WriteLine(txt.SelectedText)
    End Sub
  End Class
End Namespace

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TextBox Selection start, end and selected text : TextBox « Windows Presentation Foundation « VB.Net

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