Async/Await in C#: When to Return Task vs. Void?

C#asynchronous programming

The return value of the method: async or Task? void

When using C#for asynchronous programming, the

method can return async or Task. This choice is essential because it determines the behavior of the method and its way of interacting with the call code. void

When to return

Task

Usually, when you want to make the progress or result of the asynchronous operation to the call party, you should return

. This allows the caller to wait for the task and continue to perform after it is completed. Back to Task can also use abnormal processing and asynchronous mode, such as Task, which can monitor the progress of multiple tasks. async-foreach

When to return

void

The only situation that is suitable to return

to async is when you clearly need void return type, for example, in the event processing program or UI callback. In these cases, the caller should not be able to wait for this method, and and void keywords are not necessary. async await Avoid top -level Method

The method of has a special semantics and should be used with caution. They represent top asynchronous operations, and compared with the method of returning tasks, they have different abnormal treatment rules. The abnormalities in the top method are considered unprocessed abnormalities and may lead to accidental behavior. async void

For example, consider the following code:

async void void In this case, using

is unnecessary, and there may be problems, because:

public static async void AsyncMethod2(int num)
{
    await Task.Factory.StartNew(() => Thread.Sleep(num));
}

It prevents the call party from waiting for this method and monitoring its progress.

The abnormalities in the method will not be processed and may cause abnormal application behavior. async void

It is best to use the method and
1. keywords to ensure the correct abnormal treatment and maintain the ability to track and manage asynchronous operations.

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