TextBox PreviewKeyDown, PreviewKeyUp, PreviewTextInput, KeyDown, KeyUp and TextChanged events : Key Event « Windows Presentation Foundation « VB.Net Tutorial

1. VB.Net Tutorial
2. Windows Presentation Foundation
3. Key Event

<Window x:Class="RoutedEvents.KeyPressEvents"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="KeyPressEvents" Height="400" Width="400" >
    <StackPanel>
          <DockPanel Margin="5">
            <TextBlock Margin="3" >Type here:</TextBlock>
            <TextBox PreviewKeyDown="KeyEvent" KeyDown="KeyEvent" 
                     PreviewKeyUp="KeyEvent" KeyUp="KeyEvent"
                     PreviewTextInput="TextInput"
                     TextChanged="TextChanged"></TextBox>
          </DockPanel>
      <ListBox Margin="5" Name="lstMessages"></ListBox>
      <CheckBox Margin="5" Name="chkIgnoreRepeat">Ignore Repeated Keys</CheckBox>
      <Button Click="cmdClear_Click" HorizontalAlignment="Right">Clear List</Button>
    </StackPanel>
</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 RoutedEvents
  Public Partial Class KeyPressEvents
    Inherits System.Windows.Window
    Public Sub New()
      InitializeComponent()
    End Sub

    Private Sub KeyEvent(sender As Object, e As KeyEventArgs)
      If CBool(chkIgnoreRepeat.IsChecked) AndAlso e.IsRepeat Then
        Return
      End If

      Dim message As String = "Event: " & Convert.ToString(e.RoutedEvent) & " " & " Key: " & Convert.ToString(e.Key)
      lstMessages.Items.Add(message)
    End Sub

    Private Sub TextInput(sender As Object, e As TextCompositionEventArgs)
      Dim message As String = "Event: " & Convert.ToString(e.RoutedEvent) & " " & " Text: " & e.Text
      lstMessages.Items.Add(message)
    End Sub

    Private Sub TextChanged(sender As Object, e As TextChangedEventArgs)
      Dim message As String = "Event: " & Convert.ToString(e.RoutedEvent)
      lstMessages.Items.Add(message)
    End Sub

    Private Sub cmdClear_Click(sender As Object, e As RoutedEventArgs)
      lstMessages.Items.Clear()
    End Sub
  End Class
End Namespace

16.90.Key Event
	16.90.1.	Creating a KeyBinding between the Open command and Ctrl-R
	16.90.2.	Command Handler Key Binding
	16.90.3.	Use Keyboard.Focus to set the focus to a Text Field
	16.90.4.	Provide Quick Keyboard Access to Buttons
	16.90.5.	Reading keyboard modifiers
	16.90.6.	Reading individual key state with Keyboard.IsKeyDown
	16.90.7.	Use InputBinding to bind Application commends to Key events
	16.90.8.	Suppress Keyboard and Mouse Events
	16.90.9.	Query Left / Right control key
	16.90.10.	Is Key.CapsLock Toggled
	16.90.11.	Keyboard.IsKeyToggled
	16.90.12.	Query Number lock key
	16.90.13.	Use KeyBinding to bind Key event to TextBox.InputBindings
	16.90.14.	Custom Command by KeyGesture and RoutedUICommand
	16.90.15.	TextBox PreviewKeyDown, PreviewKeyUp, PreviewTextInput, KeyDown, KeyUp and TextChanged events
	16.90.16.	StackPanel PreviewTextInput and PreviewKeyDown
	16.90.17.	If input is not a number do not handle the key event
	16.90.18.	RoutedEvents: Tunneled Key Press
	16.90.19.	On Key Down Handler