Handler for the PreviewKeyDown event on the TextBox : TextBox « Windows Presentation Foundation « VB.Net






Handler for the PreviewKeyDown event on the TextBox

Handler for the PreviewKeyDown event on the TextBox
    

<Window x:Class="WpfApplication1.Window1"
  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
  Title="Window1" Height="300" Width="300">
  <Grid>
    <StackPanel>
      <TextBox x:Name="uv" PreviewKeyDown="TextBox_PreviewKeyDown" />

    </StackPanel>
  </Grid>
</Window>


//File:Window1.xaml.cs
Imports System.Windows
Imports System.Windows.Controls
Imports System.Windows.Media

Namespace WpfApplication1
  Public Partial Class Window1
    Inherits Window
    Public Sub New()
      InitializeComponent()
      DataContext = Me
    End Sub

    '
    Private Sub TextBox_PreviewKeyDown(sender As Object, e As RoutedEventArgs)
      Dim textBox As TextBox = TryCast(sender, TextBox)

      If textBox IsNot Nothing Then
        textBox.Foreground = Brushes.Firebrick
      End If
    End Sub
  End Class
End Namespace

   
    
    
    
  








Related examples in the same category

1.You cannot use TextBox and Image at the same time for Button Content
2.Single line and Multiline TextBoxSingle line and Multiline TextBox
3.TextBox ColumnTextBox Column
4.Bind value to TextBoxBind value to TextBox
5.Provide Keyboard Access to Text BoxesProvide Keyboard Access to Text Boxes
6.An upside down TextBoxAn upside down TextBox
7.Style with Data Trigger for TextBoxStyle with Data Trigger for TextBox
8.TextBox with custom ErrorTemplate and ToolTipTextBox with custom ErrorTemplate and ToolTip
9.TextBox uses the ExceptionValidationRule and UpdateSourceExceptionFilter handlerTextBox uses the ExceptionValidationRule and UpdateSourceExceptionFilter handler
10.TextBox with UpdateSourceExceptionFilter handlerTextBox with UpdateSourceExceptionFilter handler
11.TextBox focus listenerTextBox focus listener
12.TextBox MouseLeftButtonDown action and PreviewMouseLeftButtonDown actionTextBox MouseLeftButtonDown action and PreviewMouseLeftButtonDown action
13.Mark the text control as being changed to prevent any text content or selection changed eventsMark the text control as being changed to prevent any text content or selection changed events
14.Listen to TextBox text changed eventListen to TextBox text changed event
15.Format TextBox with MenuItem: normal, bold, italicFormat TextBox with MenuItem: normal, bold, italic
16.TextBox: set text, select all, clear, prepend, insert, append, cut, paste, undoTextBox: set text, select all, clear, prepend, insert, append, cut, paste, undo
17.Set TextBox to editableSet TextBox to editable
18.TextBox PreviewTextInputTextBox PreviewTextInput
19.Scroll TextBoxScroll TextBox
20.TextBox text changed eventTextBox text changed event
21.TextBox TextChanged eventTextBox TextChanged event
22.Use TextBox.CommandBindingst to bind commandUse TextBox.CommandBindingst to bind command
23.Use Dictionary to record which textbox has been changed and not savedUse Dictionary to record which textbox has been changed and not saved
24.Set TextBox ContextMenu to nullSet TextBox ContextMenu to null
25.TextBox Selection start, end and selected textTextBox Selection start, end and selected text
26.Scrollable TextBox ColumnScrollable TextBox Column
27.Check Spelling ErrorCheck Spelling Error