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How to work with Progress Bar in winforms

Anupam Mishra130218-Jan-2016
I want to use progress bar and changed its value when events are running . How to working with progress bar in such situation.
please give me a appropriate example.
thank you in advance.
c#c# .net 
Updated on 20-Jan-2016
Anupam Mishra

Anupam Mishra

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1 Answers

Anupam Mishra

Anupam Mishra

20-Jan-2016

I would like to use a BackgroundWorker. Because we have a loop that large in your WinForm it will block and your app will look like it has hanged.Now we are using BackgroundWorker.ReportProgress()to see how to report progress back to the UI thread and progress bar has been changed.

using System;
using System.ComponentModel;
using System.Threading;
using System.Windows.Forms;
namespace WorkerDemo
{
    publicpartialclassForm1 : Form
    {
        BackgroundWorker BackWorker;
        Semaphore s = newSemaphore(0, 1);
        bool b;
        public Form1()
        {
            InitializeComponent();
            BackWorker = newBackgroundWorker();
            BackWorker.DoWork += newDoWorkEventHandler(backgroundWorker1_DoWork);
            BackWorker.ProgressChanged += newProgressChangedEventHandler
             (backgroundWorker1_ProgressChanged);
            BackWorker.RunWorkerCompleted += newRunWorkerCompletedEventHandler
                 (backgroundWorker1_RunWorkerCompleted);
            BackWorker.WorkerReportsProgress = true;     BackWorker.WorkerSupportsCancellation = true;
        }
        privatevoid backgroundWorker1_ProgressChanged(object sender, ProgressChangedEventArgs e)
        {
  //Progress bar is changed when report progress is changed
            progressBar1.Value = e.ProgressPercentage;
            label1.Text = "Processing......" + progressBar1.Value.ToString() + "%";
        }
        privatevoid backgroundWorker1_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
        {
            if (e.Cancelled)
            {
                label1.Text = "Task Cancelled.";
 
            }
            elseif (e.Error != null)
            {
                label1.Text = "Error while performing background operation.";
 
            }
            else
            {
                label1.Text = "Task Completed...";
            }
            button1.Enabled = true;
            button2.Enabled = false;
        }
        privatevoid backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
        {
            for (int i = 0; i < 100; i++)
            {
                Thread.Sleep(100);
                BackWorker.ReportProgress(i);
                if (BackWorker.CancellationPending)
                {
                    e.Cancel = true;
                    BackWorker.ReportProgress(0);
                    return;
                }
                else
                {
                    Thread.Sleep(1000);
                }
            }
            BackWorker.ReportProgress(100);
        }
        privatevoid button1_Click(object sender, EventArgs e)
        {
 
            button1.Enabled = false;
            button2.Enabled = true;
            BackWorker.RunWorkerAsync();
        }
 
        privatevoid button2_Click(object sender, EventArgs e)
        {
            if (BackWorker.IsBusy)
            {
                BackWorker.CancelAsync();
            }
        }
 
        privatevoid button3_Click(object sender, EventArgs e)
        {
           
                s.Release();
                label1.Text = "Task Resume.";
             }
    }}

Output:

answer 516632001015858

you can also set the property of Progress bar, such like this:

progressbar1.Minimum=0;

progressbar1.Minimum=100; etc.


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