update ProgressBar

[=?ISO-8859-15?Q?Rico_Sch=E4pe?=]

Hi,

I want to show a progress dialog for long working tasks. The task should
be canceled too. Inspired by the article of Chris Sells "Safe, Simple
Multithreading in Windows Forms, Part 2" I've worked on.

I want to use this progress dialog from any long working task. So I
don't want to have any GUI code inside the code data handling(model).
That's why I fired a progress event in my model which should update the
progress dialog.

But the problem is, that the progress dialog will not be updated.

I start the working task in an extra thread like described in the article:


delegate void WorkerDelegate();

WorkerDelegate worker = new WorkerDelegate(threadingEventsRead);
worker.BeginInvoke(null, null);

private void threadingEventsRead() {
m_deviceModel.readEvents();
}

The GUI itself have to update it's contents with the GUI main thread.
That's why I make an Control.Invoke() call:

delegate void ShowProgressDelegate(string task, int maxProgress, int
currentProgress);

public void onNotification(IEventPublisher publisher, EventArgs args) {
ProgressEventArgs progressArgs = args as ProgressEventArgs;
if (progressArgs != null) {
showProgress(progressArgs.ProgressState.Task,
progressArgs.ProgressState.Total,
progressArgs.ProgressState.Current);
}
}

private void showProgress(string task, int maxProgress, int
currentProgress) {
if (!m_viewer.InvokeRequired) {
m_viewer.ProgressDialog.setCurrentTask(task);
m_viewer.ProgressDialog.CurrentStep = currentProgress;
m_viewer.ProgressDialog.MaxStep = maxProgress;
} else {
ShowProgressDelegate showProgressDelegate = new
ShowProgressDelegate(showProgress);
m_viewer.Invoke(showProgressDelegate, new object[] {task,
maxProgress, currentProgress});
}
}

Like I said, the progress dialog popup but don't update it's progress. I
start all from the main form with:

private void menuReadEvents_Click(object sender, EventArgs e) {
m_mainController.readEvents();
m_progressDialog.ShowDialog();
}

Has anybody a hint how to solve this ?

Thanks in forward
Rico

 

[Robbe Morris [C# MVP]]

An oldy that you could ugrade to .net 2.0

http://www.eggheadcafe.com/articles/asynchronous_events.asp

--
Robbe Morris - 2004-2006 Microsoft MVP C#
I've mapped the database to .NET class properties and methods to
implement an multi-layered object oriented environment for your
data access layer. Thus, you should rarely ever have to type the words
SqlCommand, SqlDataAdapter, or SqlConnection again.
http://www.eggheadcafe.com/articles/adonet_source_code_generator.asp

 

[Roman Wagner]

use a backgroundworker to wrap your long running process. see
http://msdn2.microsoft.com/de-de/library/system.componentmodel.backgroundworker(VS.80).aspx