When is an asynchronous task method used?
When no result value is needed, an async task method is better than an async void method because it allows the caller to also use await to wait for it, which makes calling and handling exceptions easier. Finally, asynchronous methods that return Task , for example Task , are used when the asynchronous operation has a result value.
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How to write to a file in async?
To get started, create an asynchronous method called WriteFileAsync(). This method will take arguments for the directory path, the file name, and the content to write to the file.
When to use async in a method declaration?
Interfaces cannot use async in a method declaration, simply because it is not necessary. If an interface requires a method to return a Task , the implementation can choose to use async, but whether or not it does so is a choice for the implementing method.
When to throw an exception in an async method?
The exception will not be thrown until that task is expected (we could also have chosen to inspect the task to see if it succeeded without throwing the exception). I guess which one you will use will depend on the desired behavior.
How to do asynchronous programming in Microsoft Docs?
Asynchronous programming with async and await. 1 Pour a cup of coffee. 2 Heat a frying pan, then fry two eggs. 3 Fry three slices of bacon. 4 Toast two pieces of bread. 5 Add butter and jam to the toast. 6 Pour a glass of orange juice.
Is there a return type for an async method?
We’ll look at better ways to do this in Chapter 7. There are three return types that a method marked as async can have: No other return types are allowed because async methods generally don’t terminate when they return.
When does control return to the caller in async?
GetUrlContentLengthAsync cannot continue until getStringTask completes. Meanwhile, control returns to the caller of GetUrlContentLengthAsync. Control resumes here when getStringTask completes. The await operator then retrieves the result of the string from getStringTask. The return statement specifies an integer result.