Return a Value from a Task

Question

hello,

i'm trying to retreive data from a Task via a web service but it generate an error while that

it execute the asynchro function but can't retreive data with Task.result

How can i fix it

thanks for advance

Answer 1

This should work.  

            int x = await GetValueSlow();
        }

        public async Task<int> GetValueSlow()
        {
            Task.Delay(1000);
            return 12;
        }

Answer 2

i used this but it genetrate an error while retreiving data

void async SomeMethod()
{
    ServiceClient proxy = new ServiceClient();
    Task<T> results = await proxy.CallAsync(param1, param2);
    T result = results.Result;// here it generates the error
    if (result.Success)
    {
       // Do something with result
    }
}

Answer 3

await will unwrap the task and reads it return. if there is something went wrong the exception will be throw. so your code will look more like this:

void async SomeMethod()
{
try
{
    ServiceClient proxy = new ServiceClient();
    var results = await proxy.CallAsync(param1, param2);
    // Do something with result
}
catch
{
//exception handling
}
}
  

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Microsoft Certified Solutions Developer - Windows Store Apps Using C#