Passing a method to a backgroundworker dowork

Question

In the code below, is there a way to instead of always subscribing the updateWorker_DoWork method, pass it a method like this

public void GetUpdates(SomeObje         


        

Answer 1

For your RunWorkerAsync() you can pass any argument you like. You can just put a Func() or Action() into it and in your DoWork() you just cast the object back to this specific type and call it.

Examples are here and here.

private void InitializeBackgroundWorker()
{
    _Worker = new BackgroundWorker();

    // On a call cast the e.Argument to a Func<TResult> and call it...
    // Take the result from it and put it into e.Result
    _Worker.DoWork += (sender, e) => e.Result = ((Func<string>)e.Argument)();

    // Take the e.Result and print it out
    // (cause we will always call a Func<string> the e.Result must always be a string)
    _Worker.RunWorkerCompleted += (sender, e) =>
    {
        Debug.Print((string)e.Result);
    };
}

private void StartTheWorker()
{
    int someValue = 42;

    //Take a method with a parameter and put it into another func with no parameter
    //This is called currying or binding
    StartTheWorker(new Func<string>(() => DoSomething(someValue)));

   while(_Worker.IsBusy)
       Thread.Sleep(1);

   //If your function exactly matches, just put it into the argument.
   StartTheWorker(AnotherTask);
}

private void StartTheWorker(Func<string> func)
{
    _Worker.RunWorkerAsync(func);
}

private string DoSomething(int value)
{
    return value.ToString("x");
}

private string AnotherTask()
{
    return "Hello World";
}

Answer 2

Worked it out, was way simpler than I was thinking. Just had to make a delegate for the method called on DoWork. Probably should have phrased my original question better.

    public delegate void DoWorkDelegate(object sender,DoWorkEventArgs e);

     public void GetUpdates()
     {
         StartWorker(new DoWorkDelegate(updateWorker_DoWork));
     }

     public void StartWorker(DoWorkDelegate task)
     {
         //Set up worker
         updateWorker.WorkerReportsProgress = true;
         updateWorker.WorkerSupportsCancellation = true;
         updateWorker.DoWork += new DoWorkEventHandler(task);
         updateWorker.RunWorkerCompleted +=
             new RunWorkerCompletedEventHandler(updateWorker_RunWorkerCompleted);
         updateWorker.ProgressChanged +=
             new ProgressChangedEventHandler(updateWorker_ProgressChanged);

         //Run worker
         _canCancelWorker = true;
         updateWorker.RunWorkerAsync();
         //Initial Progress zero percent event
         _thes.UpdateProgress(0);
     }

      private void updateWorker_DoWork(object sender, DoWorkEventArgs e)
      {
          BackgroundWorker worker = sender as BackgroundWorker;
          e.Result = GetUpdatesTask(worker, e);
      }

Answer 3

If I didn't misunderstand you, you need lambda expressions to construct anonymous method.

updateWorker.DoWork += (sender,e)=>
  {
      //bla
  }

Now you needn't always to write a method and pass it to new DoWorkEventHandler(myMethod)