Async method calling async method and awaiting another method (http client)

Question

I have some problem with async method.

public async void MakePost()
    {
        var cookieArray =  GetCookies().Result;
       (...)
    }
async public Task<string[]> GetCookies()
    {
        (...)
        var response = await httpClient.SendAsync(request);
        string cookieTempSession = response.Headers.ToString();
        (...)
        return cookieArray;
    }

Nothing happening after var response = await httpClient.SendAsync(request); I put breakpoint in next line string cookieTempSession = response.Headers.ToString(); but it never reach it. I tried to "try catch" but also nothing happend. When I merge this two methods into one it works perfect but it's not so pretty. I just wondering what happened there.

As far as debugging async methods with breakpoints goes, it's somewhat unpredictable, so I wouldn't rely on what you observed in a debugger. — Sergey Kalinichenko
– Sergey Kalinichenko, Commented May 24, 2017 at 10:55

Sergey Kalinichenko · Accepted Answer · 2017-05-24 10:54:21Z

1

Since the first method is async, you should use await instead of Result:

var cookieArray = await GetCookies();

If you are not programming front end, add ConfigureAwait(false) (why?) to the call, like this:

var cookieArray = await GetCookies().ConfigureAwait(false);
...
var response = await httpClient.SendAsync(request).ConfigureAwait(false);

answered May 24, 2017 at 10:54

Sergey Kalinichenko

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3 Comments

OskarS Over a year ago

Thank You. It worked. Now i will try to figure why. Have a nice day! :)

Sergey Kalinichenko Over a year ago

@OskarS You are welcome! Here is a hint on what may have happened before.

Stephen Cleary Over a year ago

@OskarS: The key guideline is don't block on async code.

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