CODEWITHSUNDEEP
c#wpfmultithreadingbackgroundworkerprogress
Julien Daniel
Julien Daniel

Reputation: 287

Show progress in dialog

I have a process that takes a long time, and I want a window to show the progress. But, I can't figure how to display the progress.

Here's the code:

if (procced)
{
    // the wpf windows :
    myLectureFichierEnCour = new LectureFichierEnCour(_myTandemLTEclass);
    myLectureFichierEnCour.Show();

    bgw = new BackgroundWorker();
    bgw.DoWork += startThreadProcessDataFromFileAndPutInDataSet;
    bgw.RunWorkerCompleted += threadProcessDataFromFileAndPutInDataSetCompleted;

    bgw.RunWorkerAsync();
}

And:

private void startThreadProcessDataFromFileAndPutInDataSet(object sender, DoWorkEventArgs e)
{
    _myTandemLTEclass.processDataFromFileAndPutInDataSet(
        _strCompositeKey,_strHourToSecondConversion,_strDateField);
}

I can call _myTandemLTEclass.processProgress to get a hint of the progress.

Upvotes: 2

Views: 3193

Answers (2)

user195488
user195488

Reputation:

Your backgroundWorker thread needs to handle the DoWork method and ProgressChanged.

You also need to make sure you turn on the WorkerReportsProgress flag to true (off by default).

See example code:

private void downloadButton_Click(object sender, EventArgs e)
{
    // Start the download operation in the background.
    this.backgroundWorker1.RunWorkerAsync();

    // Disable the button for the duration of the download.
    this.downloadButton.Enabled = false;

    // Once you have started the background thread you 
    // can exit the handler and the application will 
    // wait until the RunWorkerCompleted event is raised.

    // Or if you want to do something else in the main thread,
    // such as update a progress bar, you can do so in a loop 
    // while checking IsBusy to see if the background task is
    // still running.

    while (this.backgroundWorker1.IsBusy)
    {
        progressBar1.Increment(1);
        // Keep UI messages moving, so the form remains 
        // responsive during the asynchronous operation.
        Application.DoEvents();
    }
}

Upvotes: 1

Mehrdad Afshari
Mehrdad Afshari

Reputation: 421988

You should handle the ProgressChanged event and update the progress bar in your user interface there.

In the actual function that does the work (DoWork event handler), you'll call the ReportProgress method of the BackgroundWorker instance with an argument specifying the amount of task completed.

The BackgroundWorker example in MSDN Library is a simple code snippet that does the job.

Upvotes: 6

Related Questions