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

This is unnecessary and Task.Run will suffice as the Task Scheduler will set any task to LongRunning if it runs for more than 0.5 seconds.

See here why. https://blog.stephencleary.com/2013/08/startnew-is-dangerous.html

You need to specify custom TaskCreationOptions. Let’s consider each of the options. AttachedToParent shouldn’t be used in async tasks, so that’s out. DenyChildAttach should always be used with async tasks (hint: if you didn’t already know that, then StartNew isn’t the tool you need). DenyChildAttach is passed by Task.Run. HideScheduler might be useful in some really obscure scheduling scenarios but in general should be avoided for async tasks. That only leaves LongRunning and PreferFairness, which are both optimization hints that should only be specified after application profiling. I often see LongRunning misused in particular. In the vast majority of situations, the threadpool will adjust to any long-running task in 0.5 seconds - without the LongRunning flag. Most likely, you don’t really need it.