Is it possible that Parallel.ForEach Loop will handle all my collection in order

Question

I am using Parallel.ForEach Loop with my collection and i saw that this process my collection in some arbitrary oder or maybe divide my collection into pices so Is it possible that Parallel.ForEach Loop will handle all my collection in order ?

Edit

list<MyData> mylist;

private void StartTransmit(ObservableCollection<WiresharkFile> files)
        {
    cancellationTokenSource = new CancellationTokenSource();
    var token = cancellationTokenSource.Token;
    Task.Factory.StartNew(() =>
    {
        try
        {
                Parallel.For(0, files.Count, new ParallelOptions { MaxDegreeOfParallelism = 5},
                i =>
                {
                    if (token.IsCancellationRequested)
                        return;

                    //do work...
                    files[i].ProcessFile();
                });
        }
        catch (Exception e)
        { }

    }, cancellationTokenSource.Token,
   TaskCreationOptions.None,
   TaskScheduler.Default).ContinueWith(
        t =>
        {

        }
    );
}

Answer 1

Parallel.ForEach is made to work parallel. if your collection has very big logic which requires outside resources then only it will work in random order because it does not wait for one iteration to get complete. If you want to process collection in order then Paraller.ForEach is bad idea. Go with foreach .

One of the solution could be setting MaxDegreeOfParallelism property of ParallelOptions class to 1. like

Parallel.For(0, 1000, new ParallelOptions { MaxDegreeOfParallelism = 1 },
  i =>
  {

  });