How to pass LongRunning flag specifically to Task.Run()?

Question

I need a way to set an async task as long running without using Task.Factory.StartNew(...) and instead using Task.Run(...) or something similar.

Context:

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Answer 1

On a dedicated thread, there's nothing to yield to. Don't use async and await, use synchronous calls.

This question gives two ways to do a cancellable sleep without await:

Task.Delay(500, cts.Token).Wait(); // requires .NET 4.5

cts.WaitHandle.WaitOne(TimeSpan.FromMilliseconds(500)); // valid in .NET 4.0 and later

If part of your work does use parallelism, you can start parallel tasks, saving those into an array, and use Task.WaitAny on the Task[]. Still no use for await in the main thread procedure.