c# - instantiate global variables in parallel way within WPF application -

in wpf application , instantiation of viewmodel classes takes lot of time, think, solve issue, create static objects when launch application :

 protected override  void onstartup(startupeventargs e)     {          viewmodellocator locator = (viewmodellocator)app.current.resources["locator"];         loginwindowviewmodel.objficheviewmodel = locator.ficheviewmodel;         loginwindowviewmodel.objformationsviewmodel = locator.formationsviewmodel;         loginwindowviewmodel.objfacturationviewmodel = locator.facturationviewmodel;         loginwindowviewmodel.objgestiondpcviewmodel = locator.gestiondpcviewmodel;         loginwindowviewmodel.objgestiongdpviewmodel = locator.gestiongdpviewmodel;      } 

so need know :

1. is solution?
2. how improve make instantiation work in parallel way avoid ui pause( instantiation part takes 5 seconds!!)

you can make use of async , await set viewmodels.

consider this:

create property called issettingup in loginwindowviewmodel, so:

private bool _issettingup;      public bool issettingup     {         { return _issettingup; }         set          {              _issettingup = value;              //on property changed stuff             onpropertychanged();         }     } 

then create async method responsible creating viewmodels.

public async void setup()     {         this.issettingup = true;          await setupviewmodels();          //other initialization stuff here if needed          this.issettingup = false;     } 

and setupviewmodels method this:

private async task setupviewmodels()     {         await task.factory.startnew(() =>         {             viewmodellocator locator = (viewmodellocator)app.current.resources["locator"];             loginwindowviewmodel.objficheviewmodel = locator.ficheviewmodel;             loginwindowviewmodel.objformationsviewmodel = locator.formationsviewmodel;             loginwindowviewmodel.objfacturationviewmodel = locator.facturationviewmodel;             loginwindowviewmodel.objgestiondpcviewmodel = locator.gestiondpcviewmodel;             loginwindowviewmodel.objgestiongdpviewmodel = locator.gestiongdpviewmodel;         });     } 

to make use of issettingup property, consider creating control visible if issettingup true. perhaps loading icon, or screen overlay. ensure ui remain responsive while viewmodels being created.