¨C10C ¨C11C

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace WpfApp53
{
///

/// Interaction logic for MainWindow.xaml ///

public partial class MainWindow : Window
{
BackgroundWorker bgWorker;
public MainWindow()
{
InitializeComponent();
cancelBtn.IsEnabled = false;
}

     private void StartBtn\_Click(object sender, RoutedEventArgs e)  
     {  
         listBox1.Items.Clear();  
         startBtn.IsEnabled = false;  
         cancelBtn.IsEnabled = true;  
         bgWorker = new BackgroundWorker();  
         bgWorker.DoWork += BgWorker\_DoWork;  
         bgWorker.ProgressChanged += BgWorker\_ProgressChanged;  
         bgWorker.RunWorkerCompleted += BgWorker\_RunWorkerCompleted;  
         bgWorker.WorkerReportsProgress = true;  
         bgWorker.WorkerSupportsCancellation = true;

         int maxItems = ;  
         progressBar1.Minimum = ;  
         progressBar1.Maximum = ;

         statusTextBox.Text = "Starting...";  
         bgWorker.RunWorkerAsync(maxItems);  
     }

     private void BgWorker\_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)  
     {  
          if(e.Cancelled)  
         {  
             statusTextBox.Text = "Cancelled";  
         }  
         else  
         {  
             statusTextBox.Text = "Completed";  
         }  
         statusTextBox.IsEnabled = true;  
         cancelBtn.IsEnabled = false;  
     }

     private void BgWorker\_ProgressChanged(object sender, ProgressChangedEventArgs e)  
     {  
         double percent = (e.ProgressPercentage \* ) / ;  
         progressBar1.Value = Math.Round(percent, );  
         listBox1.Items.Add(new ListBoxItem { Content = e.ProgressPercentage + " item added" });  
         statusTextBox.Text = Math.Round(percent, ) + "% percent completed";  
     }

     private void BgWorker\_DoWork(object sender, DoWorkEventArgs e)  
     {  
         int? maxItems = e.Argument as int?;  
         for(int i=;i<=maxItems.GetValueOrDefault();i++)  
         {  
             if(bgWorker.CancellationPending)  
             {  
                 e.Cancel = true;  
                 break;  
             }  
             Thread.Sleep();  
             bgWorker.ReportProgress(i);  
         }  
     }

     private void CancelBtn\_Click(object sender, RoutedEventArgs e)  
     {  
         bgWorker.CancelAsync();  
         startBtn.IsEnabled = true;  
     }  
 }  

}