Return Await vs. Direct Task Return: When Does it Matter?

The subtle difference in asynchronous programming:

and directly return return await Task<t></t> In asynchronous programming, the choice of and directly returning

is often confusing. Although they seem to be functional in most cases, there are key differences in their behavior under certain circumstances.

return await Task<t></t> The advantages of

This subtle but important difference is appeared in return await in the blocks. Consider the following example:

In this example, if try is an asynchronous operation that runs for a long time, the using statement will release return await immediately after

after returning. However, at this time, may not have completed its task yet. This premature release may cause accidents or errors in the code.

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

On the contrary, the use of foo.DoAnotherThingAsync() in the asynchronous method is different: using DoAnotherThingAsync() foo In this case, DoAnotherThingAsync() Keywords ensure that asynchronous operations are completed before

block release

. This behavior is in line with the expected function and prevents potential errors. return await

Summary

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

await Although using is enough to return directly in most cases, when the foo block is used in the

block, the

structure provides a key advantage. By ensuring the correct release of resources, help maintain code integrity and prevent accidents.

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