How to use async await with out parameter in c#

Question

How can we use async-await in C# with out parameter safely.

for example

async public void someMethod(){
     await someOtherMethod (out string outputFromSomeOtherMethod);
     .......
     .....

}

In your sample, where method used with `await`, using of `out` parameter is safe enough. Since next line where this parameter can be consumed will be executed only after method completes. — Fabio, Jan 11 '19 at 03:28

score 7 · Accepted Answer · edited Jan 11 '19 at 15:54

In short, you don't (and you can't), we use a return

Also, when you think about it, it doesn't make any sense, its a task that finishes when it likes, if you could do that you would be forcing it to wait for the out parameter

public async Task<SomeResult> someOtherMethod() { .. }

...

var myAwesomeResult = await someOtherMethod();

Also, you cold use a delegate, func<T,U> or Action<T> as a parameter

public async Task someOtherMethod(Action<bool> someResult)
{
   await somestuff;
   someResult(true);
}

...

await someOtherMethod(b => YayDoSomethingElse(b));

Ooor as Daniel A. White commented, you could return a ValueTuple if you need easy access to multiple return types

public async Task<(int someValue,string someOtherValue)> someOtherMethod() {.. }

you could also return a tuple that might make sense. – Daniel A. White Jan 11 '19 at 02:58 — Daniel A. White, Jan 11 '19 at 02:58
@DanielA.White thanks updated and attributed – TheGeneral Jan 11 '19 at 03:02 — TheGeneral, Jan 11 '19 at 03:02

How to use async await with out parameter in c#

1 Answers1