Can an async method return null?

Task represents the execution of the asynchronous method, so for an asynchronous method to return a null task is like telling the calling code “you didn’t really just call this method” when of course it did.

Can async return void?

In short, if your async method is an event handler or a callback, it’s ok to return void .

How do I return from async task?

Async methods can have the following return types:

  1. Task, for an async method that performs an operation but returns no value.
  2. Task, for an async method that returns a value.
  3. void , for an event handler.
  4. Starting with C# 7.0, any type that has an accessible GetAwaiter method.

What is the return type of async await?

An async/await will always return a Promise . Even if you omit the Promise keyword, the compiler will wrap the function in an immediately resolved Promise . This enables you to treat the return value of an async function as a Promise , which is quite useful when you need to resolve numerous asynchronous functions.

Should I use task FromResult?

This method is useful when you perform an asynchronous operation that returns a Task object, and the result of that Task object is already computed. Show activity on this post. Use the Task. FromResult when you want to have a asynchronous operation but sometimes the result is in hand synchronously.

Can async await be halted anyways?

Async/await has a synchronous behavior, so yes it will block the current respective execution flow until it is finished. no, it won’t block the thread.

How does async void work?

Async void is only to be used for event handler/delegate comparability. that Execute is a event callback, likely from a DelegateCommand or similar. The way it works is it treats it exactly the same as if you had a function that returned a Task but the caller never called await on that returned task.

What does async function return?

Async functions always return a promise. If the return value of an async function is not explicitly a promise, it will be implicitly wrapped in a promise. Note: Even though the return value of an async function behaves as if it’s wrapped in a Promise.resolve , they are not equivalent.

Does await return a promise?

Inside an async function you can use the await keyword before a call to a function that returns a promise. This makes the code wait at that point until the promise is settled, at which point the fulfilled value of the promise is treated as a return value, or the rejected value is thrown.

Does promise all return?

The Promise. all() method takes an iterable of promises as an input, and returns a single Promise that resolves to an array of the results of the input promises. This returned promise will resolve when all of the input’s promises have resolved, or if the input iterable contains no promises.

What is task FromResult true?

FromResult(true) are cached. You’re not supposed to cache a task for a network access but one from result is perfectly fine.