c# - Cant get Async (async await) download of JSON to work -

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i've been struggling while now, can't work. i'm trying download json string windows phone 8 application, using 'sort of' async await.

i'm using the promising solution of matthias shapiro.

httpextensions.cs

 public static class httpextensions  {     public static task<stream> getrequeststreamasync(this httpwebrequest request)     {         var taskcomplete = new taskcompletionsource<stream>();         request.begingetrequeststream(ar =>         {             stream requeststream = request.endgetrequeststream(ar);             taskcomplete.trysetresult(requeststream);         }, request);         return taskcomplete.task;     }       public static task<httpwebresponse> getresponseasync(this httpwebrequest request)     {         var taskcomplete = new taskcompletionsource<httpwebresponse>();         request.begingetresponse(asyncresponse =>         {             try             {                 httpwebrequest responserequest = (httpwebrequest)asyncresponse.asyncstate;                 httpwebresponse someresponse = (httpwebresponse)responserequest.endgetresponse(asyncresponse);                 taskcomplete.trysetresult(someresponse);             }             catch (webexception webexc)             {                 httpwebresponse failedresponse = (httpwebresponse)webexc.response;                 taskcomplete.trysetresult(failedresponse);             }         }, request);         return taskcomplete.task;     }  }    public static class httpmethod  {     public static string head { { return "head"; } }     public static string post { { return "post"; } }     public static string put { { return "put"; } }     public static string { { return "get"; } }     public static string delete { { return "delete"; } }     public static string trace { { return "trace"; } }     public static string options { { return "options"; } }     public static string connect { { return "connect"; } }     public static string patch { { return "patch"; } }  }

and mainpageviewmodel.cs

    protected override void onactivate()     {         base.onactivate();         getsessions();     }      private async void getsessions()     {         var result = await getmydata("http://localhost/api/mydata");      }      public async task<string> getmydata(string urltocall)     {         httpwebrequest request = (httpwebrequest)webrequest.create(urltocall);         request.method = httpmethod.get;         httpwebresponse response = (httpwebresponse)await request.getresponseasync();         using (var sr = new streamreader(response.getresponsestream()))         {             return sr.readtoend();         }     }

once hits "httpwebresponse someresponse = (httpwebresponse)responserequest.endgetresponse(asyncresponse);", i'm getting webexception:

"system.net.webexception: remote server returned error: notfound"

when dive bit deeper, notice error isn't actual error. when check "asyncresponse" inside getresponseasync method in httpextensions class notice error:

"asyncwaithandle = 'asyncresponse.asyncwaithandle' threw exception of type 'system.notsupportedexception'"

i have no idea how work. i'm doing wrong?

i see problem now. since emulator using virtual machine cannot use localhost because localhost phone , not pc. see solution: windows phone 8 emulator: access localhost


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