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Async Methods: `return await` vs. Directly Returning `Task` – When is `await` Necessary?

Mary-Kate Olsen
Release: 2025-02-02 13:41:14
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Async Methods: `return await` vs. Directly Returning `Task` – When is `await` Necessary?

Asynchronous method:

Comparison with directly -when does return await? Task<T> await In asynchronous programming, you can write a method of returning to use the

asynchronous method, or directly return to the common method of the

object. Although these two methods are equivalent in most cases, in some specific scenarios, the use of Task<T> asynchronous methods is necessary. return await Task<T> A key difference is when using these methods with return await blocks with

statements. Consider the following two methods:

using In the first method, the try object will be released immediately after

returning. However, this may happen for a long time before the actual completion. Therefore, due to the premature release of
Task<someresult> DoSomethingAsync()
{
    using (var foo = new Foo())
    {
        return foo.DoAnotherThingAsync();
    }
}

async Task<someresult> DoSomethingAsync()
{
    using (var foo = new Foo())
    {
        return await foo.DoAnotherThingAsync();
    }
}
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, there may be errors in the first version.

Foo On the contrary, the second method of using DoAnotherThingAsync() ensures that the DoAnotherThingAsync() object is released only after Foo completed its task. This provides expected behavior.

Therefore, when you need to ensure the correct release or managing certain resources in the asynchronous operation involving an asynchronous operation involving an object of the await or an interface, you must use an asynchronous method with DoAnotherThingAsync(). Foo

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