In c# is it mandatory to use async keyword for calling method when we use Task.Run() inside the method logic to run the thread in the background?

Question

Below is the code snippet:

public async Task<ActionResult> GetProduct(int id)
        {
            /* 
             ---- some main thread logic...
             */

            Task.Run(() => {
                /* 
             ---- some background thread logic...
             */
            });

            return View();
        }

In the above code can I call Task.Run() logic without the use of async keyword in the action method? Is it mandatory to use async keyword with Task.Run()?

Please help me to get this clear.

A big difference (**though certainly not the only difference**) is by adding `await` your task will run `return View` **after** your task returns, whereas without this `await` `return View` will (likely) return **before** your task returns. — Liam, Mar 11 '20 at 11:49
@Liam, thanks for the help... Actually I don't want to use await. the intention is to use Task.Run() is that I want to run two threads, the main thread should not wait for the logic of Task.Run(). Task.Run() logic should run in the background. — swap, Mar 11 '20 at 12:02
In which case, no, you don't want to use `await`. See [Simplest way to do a fire and forget method in c# 4.0](https://stackoverflow.com/questions/5613951/simplest-way-to-do-a-fire-and-forget-method-in-c-sharp-4-0) — Liam, Mar 11 '20 at 13:41

score 3 · Accepted Answer · answered Mar 11 '20 at 11:46

3

No, it's not mandatory.

You use the async keyword when you want to use await within a method.

answered Mar 11 '20 at 11:46

Sean

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In c# is it mandatory to use async keyword for calling method when we use Task.Run() inside the method logic to run the thread in the background?

1 Answers1