Synchronous call of async Method

Question

_{Monday, May 22, 2017 5:59 PM}

Hello,

I had and I have a Problem since years.

Now that I use c# 7.0 I hoped for a Solutions - but I do not see it.

Anywhere in a library (where I have no source Code) there is a Methode in a class clsA

Task<int> ClsA.Func();

Now I want to call this method synchronously.

...in my Code I have:

void MyFunc()

{

    int x = clsA.Func();  //not possible must be await clsA.Func().

   //the Methode must not return an I must be here - after the resutl x is available

   DoSomeThing(x);

}

If I would use int x = await clsA.Func() then the Methode would return before DoSomething(x) is called.

That is not possible - because Overall the program before anything, DoSomething(x) must be called.

In the past I have used constructions with WaitHandles, which works - but that is not fine.

I simple Need:

x =  .....   clsA.Func()  and this will only return after the result is available.

So the question:

Is it possible in c# 7.0 to make such a call really synchronously?

Thank you for any help.

Rowe

All replies (5)

_{Wednesday, May 24, 2017 7:26 AM ✅Answered | 1 vote}

Hi rowe10,

Thank you for posting here.

For your question, you want to async method synchronously, please check the following link.

https://stackoverflow.com/questions/9343594/how-to-call-asynchronous-method-from-synchronous-method-in-c

It shows three ways. I hope this would be helpful.

Best Regards,

Wendy

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_{Monday, May 22, 2017 6:55 PM}

Check the members of Task<int>, such as Result: ‘int x = clsA.Func().Result’. See also other members.

_{Monday, May 22, 2017 9:18 PM}

Hello,

thank you.

I have tried what you said.

It hangs.

I have tried:

//this is the async method I want to call synchronously - means could be in

//a library where I have no Access to source.

asyncTask<int> Fa()

{            

awaitTask.Delay(5000);

return10;

            }

publicintFb()

            {

//here I try to call it synchronously - it hangs.

intx = Fa().Result;

returnx;

            }

Thank you.

Rowe

_{Monday, May 22, 2017 9:45 PM}

Are there any events defined in the class you are using that would specify success or error?

_{Monday, May 22, 2017 10:27 PM}

Hello,

no the class is only the two Methodes which I test.

Thank you and best regards

Rowi