c# - Binding ObservableCollection take much time in fact the window take much time to be displayed -


i'm using mvvm light framework wpf , have datagrid contain customers loaded sqlite database, take time display window if 1 can me can dislpay window , load datagrid separately.i think window taking time because of datagrid binding. 

 public observablecollection<custumermodel> customerlist     {                 {             _customerlist = new observablecollection<custumermodel>();             ilist<custumermodel> listcustomer = remplirelistcustomer();             _customerlist = new observablecollection<custumermodel>(listcustomer);             return _customerlist;         }

the method remplirelistcustomer 

     private ilist<custumermodel> remplirelistcustomer()     {         ilist<custumermodel> listcustomer = new list<custumermodel>();         foreach (var c in _customerservice.getallcustomers())         {             listcustomer.add((custumermodel)c);         }         return listcustomer;     }

you load data async starting new task in e.g. class' constructor.

public class yourclass {     public yourclass()     {         taskex.run(() =>         {             var listcustomer = remplirelistcustomer();             customerlist = new observablecollection<custumermodel>(listcustomer);         });     }      public observablecollection<custumermodel> customerlist { get; private set; } }

and maybe not have iterate on customers returned service using foreach, return collection _customerservice.getallcustomers()?


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