To the best of my knowledge it does yes. I use Excel via interop. I think I will refactor my logic so that this situation won't hurt, or put a "wait".


>Does the saveLedgers() method need to run on the UI thread?
>
>If not then you can do something like:

   public class Test
>    {
>        public void Doit()
>        {
>            var bg36 = new BackgroundWorker();
>            bg36.DoWork += bg36_DoWork;
>            bg36.RunWorkerAsync(this);
>        }
>
>
>        public void SaveLedgers()
>        {
>        }
>
>        private  void bg36_DoWork(Object sender, DoWorkEventArgs e)
>        {
>            var t = (Test) e.Argument;
>            t.SaveLedgers();
>        }
>
>    }

>
>>I'm using Excel interop and it seems that this functionality needs to run in the UI thread.
>>So I execute that from the ProgressChanged backgroundworker event.
>>Is there a way to have the dowork event (that invoked the progress changed event) interrupt execution until the ProgressChanged event is finished?
>>
>>Here's how the bg is initialized:
>>
>>

>>       private void initializeBackgroundWorker()
>>        {
>>            bg36 = new BackgroundWorker();
>>            bg36.DoWork += bg36_DoWork;
>>            bg36.RunWorkerCompleted += bg36_RunWorkerCompleted;
>>            bg36.WorkerReportsProgress = true;
>>            bg36.ProgressChanged += bg36_ProgressChanged;
>>            bg36.WorkerSupportsCancellation = true;
>>        }
>>

>>
>>This is how the process is started:
>>
>>

>>       private void bg36_DoWork(object sender, DoWorkEventArgs e)
>>        {
>>            BackgroundWorker bw = (BackgroundWorker)sender;
>>

>>
>>This is the call to the UI thread
>>
>>

>>            bw.ReportProgress(0, "save ledgers");
>>

>>
>>And this is the routine I would like to complete before the worker continues
>>
>>

>>       private void bg36_ProgressChanged(object sender, ProgressChangedEventArgs e)
>>        {
>>            statusTextBlock.Text = (string)e.UserState + "\n\n" + Monitor.peek();
>>            if ((string)e.UserState== "save ledgers")
>>	        {
>>		         saveLedgers();
>>            }
>>        }
>>