To implement threading using Backgroundworker control in C#.NET

It shows how to implement threading using Backgroundworker control in C#.NET

Keywords: Backgroundworker, DoWork, thread, threading, C#.NET, C Sharp.NET

Do the following:

1)      Add two Button controls, a ListBox and a ProgressBar control to Form

2)      Add a BackgroundWorker control to Form

3)      Set its WorkerReportsProgress and WorkerSupportsCancellation properties to True

4)      Add the following the form’s code:

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Windows.Forms;

namespace testc

{

    public partial class Form1 : Form

    {

        private int mMin;

        private int mMax;

        private List<int> mResults = new List<int>();

        public Form1()

        {

            InitializeComponent();

        }

        private void Form1_Load(object sender, EventArgs e)

        {

         

        }

        private void btnstart_Click(object sender, EventArgs e)

        {

           listBox1.Items.Clear();          

            mMin = 1;

            mMax = 10000;

            backgroundWorker1.RunWorkerAsync();

  

        }

        private void btnstop_Click(object sender, EventArgs e)

        {

            backgroundWorker1.CancelAsync();

        }

        private void backgroundWorker1_ProgressChanged(object sender,

            ProgressChangedEventArgs e)

        {

            progressBar1.Value = e.ProgressPercentage;

        }

        private void backgroundWorker1_RunWorkerCompleted(object sender,

            RunWorkerCompletedEventArgs e)

        {

            foreach (int item in mResults)

            {

                listBox1.Items.Add(item);

            }

        }

        private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)

        {

            mResults.Clear();

            for (int count = mMin; count <= mMax; count += 2)

            {

                bool isPrime = true;

                for (int x = 1; x <= Convert.ToInt32(count / 2); x++)

                {

                    for (int y = 1; y <= x; y++)

                    {

                        if (x + y == count)

                        {

                            //the number is not prime

                            isPrime = false;

                            break; // TODO: might not be correct. Was : Exit For

                        }

                    }

                    //short-circuit the check

                    if (!isPrime)

                        break; // TODO: might not be correct. Was : Exit For

                }

                if (isPrime)

                {

                    mResults.Add(count);

                }

                this.backgroundWorker1.ReportProgress(Convert.ToInt32((count - mMin)

                    / (mMax - mMin) * 100));

                if (this.backgroundWorker1.CancellationPending)

                {

                    return;

                }

            }

        }

      

    }

}