`return await` vs. Directly Returning a Task: Why Does `await` Matter in `using` Blocks?

vs. Back to TASK directly: return await The importance in await blocks using

Although a task is directly returned from the asynchronous method and the use of

is equal to the use of return await, there are subtle but important differences between the two when using the using block packaging method.

Considering the following two same methods:

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

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

In the first method, when returning to TASK directly, the using block will immediately release the DoAnotherThingAsync object to the Foo method to return the control code and immediately release the DoAnotherThingAsync object. However, the method may not be completed, which may lead to potential mistakes.

On the contrary, when using return await, the control flow will wait before the continuing execution. DoAnotherThingAsync is completed. This ensures that blocks are released only after the asynchronous operation is fully executed. Therefore, the second method will work normally, and the first method may be released. using Foo

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