c# - Why is isolated storage not persisting in my WP7 application? -

i using isolatedstoragesettings.applicationsettings application. code associated isolated storage occurs in application_launching, application_activated, application_closing, , application_deactivated methods follows:

public isolatedstoragesettings settings = isolatedstoragesettings.applicationsettings;   private void application_launching(object sender, launchingeventargs e) {        if (settings.contains("myobjlist"))        {            app.objlist = (observablecollection<myobj>)settings["myobjlist"];        }        else        {             settings.add("myobjlist", app.objlist);        } }  private void application_activated(object sender, activatedeventargs e) {    if (settings.contains("myobjlist"))    {        app.objlist = (observablecollection<myobj>)settings["myobjlist"];    }    else    {        settings.add("myobjlist", app.objlist);    } } private void application_deactivated(object sender, deactivatedeventargs e) {      settings["myobjlist"] = app.objlist;     settings.save(); } private void application_closing(object sender, closingeventargs e) {     settings["myobjlist"] = app.objlist;     settings.save(); } 

all of occurring in app.xaml.cs file created default every new application.

i have tried exiting application using button using windows button. leaving emulator running, tried reopening application using button, , navigating application list , opening.

the issue having on load or activation settings.contains["myobjlist"] returning false , proceeding add key settings on again.

does see why settings key (and value) not persisting?

i see issues:

1. the isolatedstoragesettings doc explicitly says not call save() because it's not thread safe (scroll down platform notes wp) , may raise exception (and cause settings not saved).

2. it seems not case here, using string "myobjlist" around pretty dangerous it's easy mispell. put inside constant , rule out typing error

3. in experience isolatedstoragesettings not robust on current wp7 version. better create class , serialize isolatedstorage file. anyways going on app have more things save , have cleaner code way.