c# - Task locking UI in WPF -

i have been trying learn process of using task in wpf , have ran snag more due lack of experience. when executing asychronous call dataservice method "getfuturework" ui thread becomes unresponsive. code can seen below. note project uses mvvm , variable "worklist" observable collection used listiview's itemsource.

  private async void loadwork()     {         worklist = await _dataservice.getfuturework("usernamehere");     } 

dataservice task

public async task<ienumerable<futurework>> getfuturework(string username)     {         using (_db = new dataentities())         {             var worklist = await (from items in _db.repair_check_in_tables                 items.location == username && items.completed == "n"                 select new futurework                 {                     formatteddate = items.estshipdate.tostring(),                     serviceid = items.service_id,                     imagepath = @"\\192.168.5.50\photos$\" + items.service_id + "p1.bmp",                     priority = items.priority                 }).tolistasync();             return worklist;         }     } 

you can't call async function window constructor, others have mentioned, you'll need way.

you use window_loaded event instead of constructor.

private async void window_loaded(object sender, routedeventargs e) {     await loadwork(); } 

then hook up:

<window x:class="asyncwindow.mainwindow" ... loaded="window_loaded"> 

edit:

if prefer stick mvvm pattern, alternate solution posted here.