c# - Unable to make asynchronous call using Windows Phone Background Task -

i have background task windows phone silverlight 8.1 app.

the background task runs fine, when put call asynchronous method in it, freezes @ stage. using debugger, stops. cannot step through code or anything.

below code:

public sealed class bgtask : ibackgroundtask     {         public async void run(ibackgroundtaskinstance taskinstance)         {             backgroundtaskdeferral _deferral = taskinstance.getdeferral();              datetime timenow = datetime.now;             timespan minus28 = new timespan(0, 28, 0);             datetime timegone = timenow.subtract(minus28);              int resultscount = await getcount();              toasttemplatetype toasttemplate = toasttemplatetype.toasttext02;             xmldocument toastxml = toastnotificationmanager.gettemplatecontent(toasttemplate);             xmlnodelist textelements = toastxml.getelementsbytagname("text");             textelements[0].appendchild(toastxml.createtextnode("new pictures!"));             textelements[1].appendchild(toastxml.createtextnode(resultscount + " new images in area"));             toastnotificationmanager.createtoastnotifier().show(new toastnotification(toastxml));              _deferral.complete();         }          private async task<int> getcount()         {             string page = "http://en.wikipedia.org/";              // ... use httpclient.             using (httpclient client = new httpclient())             using (httpresponsemessage response = await client.getasync(page))             using (httpcontent content = response.content)             {                 // ... read string.                 string result = await content.readasstringasync();                  // ... display result.                 if (result != null &&                 result.length >= 50)                 {                     //resultscount = 1888;                 }             }              return 9999; } 

while debugging, go inside getcount() method, , stops on await getcount() section.

been trying solve days. appreciated. :)

you need define deferral @ class scope. wasy deferral requested on creation , start of backgroundtask.

    public sealed class bgtask : ibackgroundtask     {         backgroundtaskdeferral _deferral = taskinstance.getdeferral();         public async void run(ibackgroundtaskinstance taskinstance)         {             //handle async stuff             _deferral.complete();         }     } 

more information can found here: https://msdn.microsoft.com/en-us/windows/uwp/launch-resume/create-and-register-a-background-task