How to correctly write Parallel.For with async methods

Question

How would I structure the code below so that the async method gets invoked?

Parallel.For(0, elevations.Count(), delegate(int i)
{
   allSheets.AddRange(await         


        

Answer 1

The easiest way to invoke your async method inside Parallel.For is next:

Parallel.For(0, elevations.Count(), async i =>
{
   allSheets.AddRange(await BuildSheetsAsync(userID, elevations[i], includeLabels));
});

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MarioDS mentioned absolutely right in the comment that in that case you may have unobserved exceptions. And this is definitely very important thing which you should always take in mind then have a deal with async delegates.

In this case if you think that you will have exceptions you can use try/catch block inside delegate. Or in some cases if your situation is good for it you can subscribe on TaskScheduler.UnobservedTaskException event.