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Can we use async without await?
In this way, an async function without an await expression will run synchronously. If there is an await expression inside the function body, however, the async function will always complete asynchronously. Code after each await expression can be thought of as existing in a .then callback.
When should await be used?
await is used for calling an async function and wait for it to resolve or reject . await blocks the execution of the code within the async function in which it is located. If the output of function2 is dependent on output of function1 then I use await .
What happens if you call async without await?
The call to the async method starts an asynchronous task. However, because no Await operator is applied, the program continues without waiting for the task to complete. In most cases, that behavior isn’t expected.
What are the benefits of eliding async and await?
For a thorough overview of the efficiency benefits of eliding async and await, see Stephen Toub’s classic video The Zen of Async or his MSDN article on the subject. When I started writing about async, I would always recommend eliding async and await, but I’ve modified that stand in recent years.
Is there syntactic sugar in async / await?
So there’s more that happens behind the scenes here. Async/Await is syntactic sugar. First look at the signature of the FindAsync function. It returns a Task. Already you’re seeing the magic of the keyword, it unboxes that Task into a Department. The calling function does not block.
Do you keep async and await keywords?
There are just too many pitfalls to recommend eliding as a default decision. These days I recommend keeping the async and await keywords around except for a few scenarios, because of the drawbacks described in the rest of this blog post. By eliding async and await, you can avoid the compiler modifications to your method.
Can a method be separated from the await?
However, if the method call is separated from the await, then the semantics are different: The invocation of the method can be separated from the await in a variety of cases. For example, the calling method may have other work to do concurrently with the asynchronous work done by our method. This is most common in code that uses Task.WhenAll.