WinForms equivalent of performSelectorOnMainThread in Objective-C

I haven't done much multithreading before and now find the need to do some background work and keep the UI responsive. I have the following code.

data.ImportProgressChanged += new 
     DataAccess.ImportDelegate(data_ImportProgressChanged);

Thread importThread = new Thread(
       new ThreadStart(data.ImportPeopleFromFAD));
importThread.IsBackground = true;
importThread.Start();

void data_ImportProgressChanged(int progress)
{
    toolStripProgressBar.Value = progress;
}

//In my data object I have 
public void ImportPeopleFromFAD()
{
    ImportProgressChanged(someInt);
}

But the UI doesn't get updated since the ImportProgressChanged() call is made on the background thread. In objective C I know you can use performSelectorOnMainThread and pass it a method to call usi开发者_JAVA百科ng the main thread. What is the equivalent way of calling ImportProgressChanged() from the main thread?

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(Assuming Windows Forms.) You can use Control.Invoke or Control.BeginInvoke - but a cleaner way may be to use BackgroundWorker to start with.

In WPF you'd use a Dispatcher instead of Control.Invoke, btw. See this WPF threading model guide for more details.

EDIT: Personally I probably wouldn't bother testing InvokeRequired first - I'd just call Invoke or BeginInvoke. If you're already "on" the right thread it won't do any significant harm.

For progress bars, however, BackgroundWorker is definitely the way forward.

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Instead of updating the GUI, data_ImportProgressChanged should throw an exception when it gets called changes the progressbar.

The shortest change is to use Control.InvokeRequired and .Invoke(), but the Backgroundworker was especially created for this scenario .

If you want to solve it in the data object you will have to make that depend on the GUI so its better to solve this in the handler:

void data_ImportProgressChanged(int progress)
{
    if (toolStripProgressBar.InvokeRequired)
    {
        Action<int> a = new Action(data_ImportProgressChanged);
        toolStripProgressBar.Invoke(a, progress);
    }
    else
        toolStripProgressBar.Value = progress;
}

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You already have your answer but I'll add my solution anyway:

void data_ImportProgressChanged(int progress)
{
    if (InvokeRequired)
    {
        BeginInvoke(new Action<int>(data_ImportProgressChanged),progress);
        return;
    }

    toolStripProgressBar.Value = progress;
}