Async/Await vs. Directly Returning Task: When Does `return await` Matter?

The use of

and async in asynchronous programming is very common, and many people are doubting the difference between await and directly returning return await objects. This article explores different scenes of these two methods. Task<T>

Why do you still need to use

when you can return Task<T> directly? return await

In most cases, the

object and use Task<T> are functional. However, there is an exception: in the return await structure in the using sentence or try block. return await

Example: Sentences and

and using async return await Consider the following code:

In the first method,

Task<someresult> DoSomethingAsync()
{
    using (var foo = new Foo())
    {
        return foo.DoAnotherThingAsync();
    }
}

async Task<someresult> DoSomethingAsync()
{
    using (var foo = new Foo())
    {
        return await foo.DoAnotherThingAsync();
    }
}

The

method immediately releases the using object after returning, and even before it is completed. This is likely to cause errors, because the DoAnotherThingAsync() object is released prematurely. Foo Foo However, in the second method,

Keywords ensure that the

object is released only after the await method is completed, thereby preventing any potential errors. DoAnotherThingAsync() Foo Conclusion

In short, although the

object is usually equivalent to the use of

, it must be noted that

or Task<T> in the return await structure will significantly change the special circumstances of the behavior. Understanding this difference can ensure the correct implementation of asynchronous operations. using

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