Create a Background Worker Thread in XAML

     

<Window x:Class="WpfApplication1.Window1"
   xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
   xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
   xmlns:ComponentModel="clr-namespace:System.ComponentModel;assembly=System"
   Title="WPF" Height="100" Width="200">
    
    <Window.Resources>
        <ComponentModel:BackgroundWorker
            x:Key="backgroundWorker"
            WorkerReportsProgress="True"
            WorkerSupportsCancellation="True"
            DoWork="BackgroundWorker_DoWork"
            RunWorkerCompleted="BackgroundWorker_RunWorkerCompleted"
            ProgressChanged="BackgroundWorker_ProgressChanged"/>
    </Window.Resources>
    
    <StackPanel>
        <ProgressBar Name="progressBar"/>
        <Button Name="button" Click="button_Click" HorizontalAlignment="Center">Start</Button>
    </StackPanel>
</Window>
//File:Window.xaml.vb

Imports System
Imports System.ComponentModel
Imports System.Threading
Imports System.Windows
Imports System.Windows.Input

Namespace WpfApplication1
  Public Partial Class Window1
    Inherits Window
    Private ReadOnly worker As BackgroundWorker

    Public Sub New()
      InitializeComponent()
      worker = TryCast(Me.FindResource("backgroundWorker"), BackgroundWorker)
    End Sub

    Private Sub button_Click(sender As Object, e As RoutedEventArgs)
      If Not worker.IsBusy Then
        Me.Cursor = Cursors.Wait
        worker.RunWorkerAsync()
        button.Content = "Cancel"
      Else
        worker.CancelAsync()
      End If
    End Sub

    Private Sub BackgroundWorker_DoWork(sender As Object, e As System.ComponentModel.DoWorkEventArgs)
      For i As Integer = 1 To 100
        If worker.CancellationPending Then
          Exit For
        End If

        Thread.Sleep(100)
        worker.ReportProgress(i)
      Next
    End Sub

    Private Sub BackgroundWorker_RunWorkerCompleted(sender As Object, e As System.ComponentModel.RunWorkerCompletedEventArgs)
      Me.Cursor = Cursors.Arrow
      Console.WriteLine(e.[Error].Message)
      button.Content = "Start"
    End Sub

    Private Sub BackgroundWorker_ProgressChanged(sender As Object, e As System.ComponentModel.ProgressChangedEventArgs)
      progressBar.Value = e.ProgressPercentage
    End Sub
  End Class
End Namespace

1.	Create a multi threaded web browsing application.
2.	Show a Continuous Animation During an Asynchronous Process
3.	Load the Data for a Window Asynchronously After It Has Rendered
4.	Check Whether You Are Running on the UI Thread
5.	Ensure That You Are Running on the UI Thread
6.	A Cancellable ProgressBar While Processing on a Background Thread
7.	Show a Continuous Progress Bar While Processing on a Background Thread
8.	Execute a Method Asynchronously Using the Dispatcher Queue
9.	Thread Sleep in Button Click handler
10.	Execute a Method Asynchronously Using a Background Worker Thread
11.	Track the Progress of a Background Worker Thread
12.	Support the Cancellation of a Background Worker Thread
13.	WPF Threading
14.	BlockThread.xaml
15.	Keep the UI from becoming non-responsive in single threaded application which performs a long operation.

Create a Background Worker Thread in XAML : Thread « Windows Presentation Foundation « VB.Net

Related examples in the same category