Notify when thread is complete, without locking calling thread

Question

I am working on a legacy application that is built on top of NET 3.5. This is a constraint that I can\'t change. I need to execute a second thread to run a long running tas

Answer 1

You can use a combination of custom event and the use of BeginInvoke:

public event EventHandler MyLongRunningTaskEvent;

private void StartMyLongRunningTask() {
    MyLongRunningTaskEvent += myLongRunningTaskIsDone;
    Thread _thread = new Thread(myLongRunningTask) { IsBackground = true };
    _thread.Start();
    label.Text = "Running...";
}

private void myLongRunningTaskIsDone(object sender, EventArgs arg)
{
    label.Text = "Done!";
}

private void myLongRunningTask()
{
    try 
    { 
        // Do my long task...
    } 
    finally
    {
        this.BeginInvoke(Foo, this, EventArgs.Empty);
    }
}

I checked, it's work under .NET 3.5