How to show Progress Bar in WPF C#

Question

1.00/5 (2 votes)

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Hello Friends,

I want to show progress bar on WPF Window.
and I want to update its value by click on one Button.

I have tried background worker but it is not is of no use.

Please help to implement simple method by which I can update values/texts on UI Form.

I have below code till now -

 private void btn_Upload_Click(object sender, RoutedEventArgs e)
        {           
            Proc_Bar.Value = 0;
            BackgroundWorker worker = new BackgroundWorker();
            worker.WorkerReportsProgress = true;
            worker.DoWork += new DoWorkEventHandler(worker_DoWork);
            worker.RunWorkerAsync();

        }


  void worker_DoWork(object sender, DoWorkEventArgs e)
        {
            testProcBar();
            
        }


private void testProcBar()
        {
         

            Thread.Sleep(3000);
            Proc_Bar.Value = Proc_Bar.Value + 1;
            Thread.Sleep(3000);
            Proc_Bar.Value = Proc_Bar.Value + 1;
Thread.Sleep(3000);
            Proc_Bar.Value = Proc_Bar.Value + 1;
Thread.Sleep(3000);
            Proc_Bar.Value = Proc_Bar.Value + 1;
Thread.Sleep(3000);
            Proc_Bar.Value = Proc_Bar.Value + 1;
Thread.Sleep(3000);
            Proc_Bar.Value = Proc_Bar.Value + 1;
Thread.Sleep(3000);
            Proc_Bar.Value = Proc_Bar.Value + 1;


        }

Please help.!!!

Posted 26-Aug-15 20:10pm

Pravinkarne.31

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Comments

Philippe Mori 27-Aug-15 12:20pm

You are not using the background worker correctly. At least, you should call ReportProgress to update the progress bar. It should not be jard to find a lot of example on the web.

2 solutions

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Frank Lindecke · Accepted Answer · 2015-08-26T22:54:00

Here is a my solution (with cancelling support). Button is named "Start", Progress bar is named "Progress1".

C#

private CancellationTokenSource _cancellation;

private async void Start_Click( object sender, RoutedEventArgs e )
{
    if ( _cancellation != null )
    {
        _cancellation.Cancel( false );
        _cancellation.Dispose();
    }
    _cancellation = new CancellationTokenSource();

    try
    {
        Debug.WriteLine(
          "Start_Click: My Thread id is {0}",
          Thread.CurrentThread.ManagedThreadId );

         // call it in another thread
         await Task.Run(
             () => AsyncUpdateProgressBar( _cancellation.Token ),
             _cancellation.Token )
           .ConfigureAwait( false );

         // call it in same thread
         //await AsyncUpdateProgressBar(_cancellation.Token);
     }
     catch ( TaskCanceledException )
     {
         // ignore
     }
 }

 private async Task AsyncUpdateProgressBar( CancellationToken token )
 {
     Debug.WriteLine(
       "AsyncUpdateProgressBar: My Thread id is {0}",
       Thread.CurrentThread.ManagedThreadId );

     for ( var i = 0; i <= 100 & !token.IsCancellationRequested; i++ )
     {
         // update value on dispatcher async
         // this is necessary, when calling this method from another thread
         // than the user interface thread!!!
         var tempLocal = i;
         await Dispatcher.InvokeAsync( () => Progress1.Value = tempLocal );

         // wait a little while
         await Task.Delay( 100, token );
     }

 }

Chandra Shekhar Joshi · Accepted Answer · 2015-08-27T18:50:00

Solution 2

Create class variable as

C#

private readonly SynchronizationContext context = null;

initialize that in constructor :

C#

this.context =  SynchronizationContext.Current;

Now whenever update the UI Thread us it like below :

C#

this.context.Send(x => Proc_Bar.Value = Proc_Bar.Value + 1;, null);

This might help, try this.

Posted 27-Aug-15 18:50pm

Chandra Shekhar Joshi

Comments

Pravinkarne.31 28-Aug-15 4:01am

Thanks..
After changing to
this.context.Send(x => Proc_Bar.Value = Proc_Bar.Value + 1, null);
working correctly.