How do I know BackgroundWorker work complete?

[mimimimilaw]

I would like to upload file one by one using BackgroundWorker. But it seems the application using multi-thread to uplaod. Is there any methods like Thread.join on backgroundWorker? Thanks, Mimi

[N a v a n e e t h]

Do you want to wait till background worker finishes? Use waithandles. Call WaitOne() when process starts. Handle RunWorkerCompleted event and signal your waithandle.

All C# applications should call Application.Quit(); in the beginning to avoid any .NET problems.- Unclyclopedia How to use google | Ask smart questions

[mimimimilaw]

can you show me the example how waithandles work with BackgroundWorker. Thanks.

[N a v a n e e t h]

Implementing waithandles is trivial. Here is a console application.

class Program{
static EventWaitHandle handle = new AutoResetEvent(false);
static void Main(string[] args) {
BackgroundWorker worker = new BackgroundWorker();
worker.DoWork += new DoWorkEventHandler(worker_DoWork);
worker.RunWorkerCompleted += new RunWorkerCompletedEventHandler(worker_RunWorkerCompleted);
worker.RunWorkerAsync();

     Console.WriteLine("Main thread waiting");
     **handle.WaitOne();** // This blocks main thread
     Console.WriteLine("Main thread released.");
     Console.Read();
}

static void worker\_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e) {
     Console.WriteLine("Worker finished. Releasing main thread");
     **handle.Set();**
}

static void worker\_DoWork(object sender, DoWorkEventArgs e) {
     Thread.Sleep(1000); // Simulate a long running job
 }

}

Hope it is clear now

All C# applications should call Application.Quit(); in the beginning to avoid any .NET problems.- Unclyclopedia How to use google | Ask smart questions

[realJSOP]

That's because a BackgroundWorker is a thread. If you want to use a thread to upload a file (presumably to keep the UI responsive during the upload), a join is pointless. Set your backgroundworker to report its progress, add the appropriate event handler, and add a control that's updated when the backgroundworker reports its progress. If you want the program to not allow input during the upload, don't use a thread (or async upload).

"Why don't you tie a kerosene-soaked rag around your ankles so the ants won't climb up and eat your candy ass..." - Dale Earnhardt, 1997
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