How to wait for async functions in c#

Question

I have 3 async function that must run together, like this

public async Task Fun1()
{
  // do something
}
public async Task Fun2()
{
  // do something
}
public async Task Fun2()
{
  // do something
}

in my base function I call this functions this functions must run together how to wait for this functions until all complete?

public async Task BaseFun()
{
    Fun1()
    Fun2()
    Fun3()
   // do something after Fun1, Fun2 and Fun3 complete
}

"run together" that means functions don`t wait for each other — Morteza
– Morteza, Commented Oct 1, 2018 at 5:08

Akash Kava · Accepted Answer · 2018-10-01 04:45:59Z

4

public async Task BaseFun()
{
    await Task.WhenAll(Fun1(),
    Fun2(),
    Fun3());
   // do something after Fun1, Fun2 and Fun3 complete
}

edited Oct 1, 2018 at 4:45

answered Oct 1, 2018 at 4:42

Akash Kava

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Comments

Steve Tolba · Accepted Answer · 2018-10-01 04:44:52Z

1

Just add await before the functions.

public async Task BaseFun()
{
    await Fun1();
    await Fun2();
    await Fun3();
   // do something after Fun1, Fun2 and Fun3 complete
}

answered Oct 1, 2018 at 4:44

Steve Tolba

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2 Comments

peeyush singh Over a year ago

Need to be careful when using this kind of pattern in await functions, imagine each of these functions download data from website (each taking about 5 seconds). After first await the method will wait for it to complete before proceeding onto take 2. This would mean unnecessary hit on performance.

Henk Holterman Over a year ago

This would be the correct pattern when the Fun?() calls are not independent (ie, not threadsafe). The question is not totally clear.

Arphile · Accepted Answer · 2018-10-01 04:44:13Z

0

also can do as

public async Task BaseFun()
{
    await Fun1();
    await Fun2();
    await Fun3();
    // do something after Fun1, Fun2 and Fun3 complete
}

answered Oct 1, 2018 at 4:44

Arphile

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Comments

Alexander · Accepted Answer · 2018-10-01 08:32:14Z

0

You can also use Task.WaitAll.

var taskArray = new Task[3]
{
    Fun1(),
    Fun2(),
    Fun3()
};
Task.WaitAll(taskArray);

BTW, why are your Fun1-3 methods also public when you call them through a public base method?

answered Oct 1, 2018 at 8:32

Alexander

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