Get result back from async method in windows phone

Question

How get result back from async method ?

 async Task<string> Get(string Url) { HttpClient httpClient = new HttpClient(); httpClient.MaxResponseContentBufferSize = 10485760; httpClient.DefaultRequestHeaders.Add("user-agent", "Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.2; WOW64; Trident/6.0)"); HttpResponseMessage response = await httpClient.GetAsync(Url); return await response.Content.ReadAsStringAsync(); }

call the method

var a = Get(address).Result; Outbox.Text = a;

when try to get result, in output winodow i got "The thread 0xdf4 has exited with code 0 (0x0)"

and nothing happend

but i can get result by this way

 async Task Get(string Url) { HttpClient httpClient = new HttpClient(); httpClient.MaxResponseContentBufferSize = 10485760; httpClient.DefaultRequestHeaders.Add("user-agent", "Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.2; WOW64; Trident/6.0)"); HttpResponseMessage response = await httpClient.GetAsync(Url); Outbox.Text = response.Content.ReadAsStringAsync().Result; }

and call the method by this way

var a = Get(address);

i try this code on windows phone 8.1. thanks.

Kevin Gosse · Accepted Answer · 2015-04-17 14:36:51Z

2

In most cases, when calling an async method, you're supposed to await it:

var a = await Get(address); Outbox.Text = a;

Calling .Result is technically valid, but you're freezing the calling thread, which may sometimes result in a deadlock (like in your sample).

answered Apr 17, 2015 at 14:36

Kevin Gosse

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2 Comments

Cena Av Over a year ago

i try this before, the 'await' operator can only be used within an async method

Kevin Gosse Over a year ago

Which simply means that you need to add the async keyword on your method signature. For instance if you have public void Button_Click(...), change it to public async void Button_Click(...)

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