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 BuildSheetsAsync(userID, elevations[i], includeLabels));
});
Parallel.For() doesn't work well with async methods. If you don't need to limit the degree of parallelism (i.e. you're okay with all of the tasks executing at the same time), you can simply start all the Tasks and then wait for them to complete:
var tasks = Enumerable.Range(0, elevations.Count())
.Select(i => BuildSheetsAsync(userID, elevations[i], includeLabels));
List<Bitmap> allSheets = (await Task.WhenAll(tasks)).SelectMany(x => x).ToList();
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