Check Whether You Are Running on the UI Thread : Thread « Windows Presentation Foundation « VB.Net Tutorial

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VB.Net Tutorial » Windows Presentation Foundation » Thread 
16.115.4.Check Whether You Are Running on the UI Thread
<Window x:Class="WpfApplication1.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="WPF" Height="120" Width="364">
    <StackPanel>
        <Button Click="ButtonTrue_Click">UI Thread</Button>
        <Button Click="ButtonFalse_Click">Non-UI Thread</Button>
        <TextBlock x:Name="txtResult"/>
    </StackPanel>
</Window>
//File:Window.xaml.vb
Imports System.Windows
Imports System.Windows.Threading

Namespace WpfApplication1
  Public Partial Class Window1
    Inherits Window
    Private Delegate Sub CheckAccessDelegate()
    Private Delegate Sub SetResultTextDelegate(result As String)
    Public Sub New()
      InitializeComponent()
    End Sub

    Private Sub ButtonTrue_Click(sender As Object, e As RoutedEventArgs)
      CheckAccess()
    End Sub

    Private Sub ButtonFalse_Click(sender As Object, e As RoutedEventArgs)
      Dim del As New CheckAccessDelegate(AddressOf CheckAccess)
      del.BeginInvoke(Nothing, Nothing)
    End Sub

    Private Overloads Sub CheckAccess()
      If txtResult.Dispatcher.CheckAccess() Then
        txtResult.Text = "True"
      Else
        txtResult.Dispatcher.BeginInvoke(DispatcherPriority.Normal, New SetResultTextDelegate(AddressOf SetResultText)"False")
      End If
    End Sub

    Private Sub SetResultText(result As String)
      txtResult.Text = result
    End Sub
  End Class
End Namespace
WPF Check Whether You Are Running On The U I Thread
16.115.Thread
16.115.1.Create a multi threaded web browsing application.Create a multi threaded web browsing application.
16.115.2.Show a Continuous Animation During an Asynchronous ProcessShow a Continuous Animation During an Asynchronous Process
16.115.3.Load the Data for a Window Asynchronously After It Has RenderedLoad the Data for a Window Asynchronously After It Has Rendered
16.115.4.Check Whether You Are Running on the UI ThreadCheck Whether You Are Running on the UI Thread
16.115.5.Ensure That You Are Running on the UI ThreadEnsure That You Are Running on the UI Thread
16.115.6.A Cancellable ProgressBar While Processing on a Background ThreadA Cancellable ProgressBar While Processing on a Background Thread
16.115.7.Show a Continuous Progress Bar While Processing on a Background ThreadShow a Continuous Progress Bar While Processing on a Background Thread
16.115.8.Execute a Method Asynchronously Using the Dispatcher QueueExecute a Method Asynchronously Using the Dispatcher Queue
16.115.9.Thread Sleep in Button Click handlerThread Sleep in Button Click handler
16.115.10.Execute a Method Asynchronously Using a Background Worker ThreadExecute a Method Asynchronously Using a Background Worker Thread
16.115.11.Track the Progress of a Background Worker ThreadTrack the Progress of a Background Worker Thread
16.115.12.Support the Cancellation of a Background Worker ThreadSupport the Cancellation of a Background Worker Thread
16.115.13.Create a Background Worker Thread in XAMLCreate a Background Worker Thread in XAML
16.115.14.WPF ThreadingWPF Threading
16.115.15.BlockThread.xamlBlockThread.xaml
16.115.16.Keep the UI from becoming non-responsive in single threaded application which performs a long operation.Keep the UI from becoming non-responsive in single threaded application which performs a long operation.
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