Set interval and event handler for DispatcherTimer

     


<Window x:Class="WpfApplication1.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="KeyboardInput" Height="300" Width="300">
    <Grid>
        
    </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
Imports System.Windows.Threading
Imports System.Diagnostics


Namespace WpfApplication1
  Public Partial Class Window1
    Inherits System.Windows.Window
    Private dt As New DispatcherTimer()
    Public Sub New()
      InitializeComponent()
      dt.Interval = TimeSpan.FromSeconds(0.5)
      AddHandler dt.Tick, New EventHandler(AddressOf dt_Tick)
      dt.Start()
    End Sub

    Private Sub dt_Tick(sender As Object, e As EventArgs)

      If (Keyboard.Modifiers And ModifierKeys.Control) <> 0 Then
        Console.WriteLine("ModifierKeys.Control")
      End If
      Dim homeKeyPressed As Boolean = Keyboard.IsKeyDown(Key.Home)
      Debug.WriteLine("Home pressed: " & homeKeyPressed)
    End Sub

  End Class
End Namespace

1.	Get event sender from event
2.	Handle the ContentRendered event
3.	Find source element of an element in event handler by casting
4.	Add an event handler to an element using code
5.	Halting event routing with Handled
6.	Security Exception
7.	Throw Handled Exception
8.	Check handler event sender
9.	Do event based on button name
10.	Add event handler to StackPanel in StackPanel resource
11.	Add a PropertyChangedValueCallback to Any Dependency Property
12.	Handle a Button Click with Shared button click handler
13.	DispatcherTimer and EventHandler
14.	Thumb DragStarted and DragCompleted event handler
15.	Get the event sender name
16.	Event firing sequence
17.	Cancel event by setting CanExecute and Handled to false
18.	Event sender, event source and event original source
19.	Cast event sender to a control
20.	Fire an event when an element gains and loses focus.

Set interval and event handler for DispatcherTimer : Event « Windows Presentation Foundation « VB.Net

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