BackgroundWorker and progress bar C# example

C# > System > ComponentModel > BackgroundWorker

The BackgroundWorker runs an operation on a separate and dedicated thread.
Time-consuming operations can cause the user interface (UI) to seem as frozen and stop responding while they are running.
BackgroundWorker class represents a solution to this.






Example

Use BackgroundWorker and progress bar to display a progress of import operation

using System;

using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Data.OleDb;
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.Forms;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace BackgroundWorker 

{
    

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

    public partial class MainWindow : Window

    {
        private BackgroundWorker worker = null;
        public MainWindow()
        {        
        }
        void worker_ProgressChanged(object sender, ProgressChangedEventArgs e)
        {          
            pBar.Value = e.ProgressPercentage;
            lblStatus.Content = "Processing......" + pBar.Value.ToString() + "%";
        }
        private void worker_DoWork(object sender, DoWorkEventArgs e)
        {
            // do your task here
            for (int i = 0; i <= 100; i++)
            {
                Thread.Sleep(500);
                if (worker == null)
                    break;
                worker.ReportProgress(i);
            }
        }
        private void worker_RunWorkerCompleted(object sender,RunWorkerCompletedEventArgs e)
        {
            lblStatus.Content = "Task finished";
        }
        private void Button_Click(object sender, RoutedEventArgs e)
        {
            if (worker == null)
            {
                worker = new BackgroundWorker();
                worker.DoWork += worker_DoWork;
                worker.RunWorkerCompleted += worker_RunWorkerCompleted;
                worker.ProgressChanged += worker_ProgressChanged;
                worker.WorkerReportsProgress = true;
                worker.WorkerSupportsCancellation = true;
            }
            if (worker.IsBusy != true)
            {
                // Start the asynchronous operation.
                worker.RunWorkerAsync();
            }
        }
        private void Window_Loaded(object sender, RoutedEventArgs e)
        {
            pBar.Maximum = 100;
        }
        private void btnCancel_Click(object sender, RoutedEventArgs e)
        {
            worker.CancelAsync();
            worker = null;
        }
    }
}