C # multithreaded BackgroundWorker class using small case-WPF program

1. The program implements a simple WPF program that uses the BackgroundWorker class to assign a value to a progress bar in a background thread.

The results of the operation are as follows:

The background thread ends up running correctly:

The background thread was canceled halfway:

2. The program only modifies the MainWindow.xaml and MainWindow.xaml.cs files, and the contents of two files are as follows

MainWindow.xaml file:

<window x:class= "Simpleworker.mainwindow"        xmlns= "http://schemas.microsoft.com/winfx/2006/xaml/ Presentation "        xmlns:x=" Http://schemas.microsoft.com/winfx/2006/xaml "        title=" MainWindow "height=" 150 " Width= "$" >    <StackPanel>        <progressbar name= "ProgressBar" height= "width=" "10" margin= " ></ProgressBar>        <button name= "btnprocess" width= "" click= "Btnprocess_click" margin= "5" > Start background task </Button>        <button name= "Btncancel" width= "click=" Btncancel_click "5" > Cancel background Tasks < /button>    </StackPanel></Window>

AinWindow.xaml.cs file:

Using system.windows;using system.componentmodel;using system.threading;namespace simpleworker{//<summary>  Interactive logic for MainWindow.xaml///</summary> public partial class Mainwindow:window {BackgroundWorker        Bgworker = new BackgroundWorker ();            Public MainWindow () {InitializeComponent ();            Bgworker.workerreportsprogress = true;            Bgworker.workersupportscancellation = true;            Bgworker.dowork + = Dowork_handler;            Bgworker.progresschanged + = Progresschanged_handler;        bgworker.runworkercompleted + = Runworkercompleted_handler;            private void Btnprocess_click (Object Sender,routedeventargs e) {if (!bgworker.isbusy)            {Bgworker.runworkerasync (); }} private void Progresschanged_handler (object sender, ProgressChangedEventArgs args) {p Rogressbar.value = args.        Progresspercentage;    }    private void Dowork_handler (object Sender,doworkeventargs args) {BackgroundWorker worker = sender A            s BackgroundWorker; for (int i = 1; i <=; i++) {if (worker. cancellationpending) {args.                    Cancel = true;                Break } else {worker.                    ReportProgress (I*10);                Thread.Sleep (500);        }}} private void Runworkercompleted_handler (object Sender,runworkercompletedeventargs args)            {progressbar.value = 0; if (args. Cancelled) {MessageBox.Show ("Background task has been canceled.            "," message "); } else {MessageBox.Show ("background task ends normally.            "," message "); }} private void Btncancel_click (Object Sender,routedeventargs e) {Bgworker.cancelasync ()        ; }    }}

C # multithreaded BackgroundWorker class using small case-WPF program