public override void OnNavigatedTo(NavigatedToEventArgs e, Dictionary<string, object> viewModelState) {
int id = (int)e.Parameter;
if (id == 0) {
SelectedPlanetVM = new PlanetViewModel();
SelectedPlanetVM.Id = id;
}
base.OnNavigatedTo(e, viewModelState);
}
// Add AppBarButton
private void AddPlanet() {
SelectedPlanetVM = new PlanetViewModel();
navigationService.Navigate("LifecycleAdd", SelectedPlanetVM.Id);
//navigationService.Navigate("LifecycleAdd", SelectedPlanetVM);
// 1/8/2016 - Even though I have 'SessionStateService.RegisterKnownType(typeof(PlanetViewModel));'
// in App.xaml.cs, when SelectedPlanetVM is passed in .Navigate I get this error:
// Exception: "Session state service failed"
// InnerExecption: "Unspecified error\r\n\r\nGetNavigationState doesn't support serialization of a parameter type
// which was passed to Frame.Navigate."
// 1/12/2016 - Here is a good discussion of the problem: // https://social.msdn.microsoft.com/Forums/en-US/ad753362-0d52-42b3-8917-b2897033ba49/getnavigationstate-doesnt-support-serialization-of-a-parameter-type-which-was-passed-to?forum=winappswithcsharp
// Another: http://stackoverflow.com/questions/23896488/getnavigationstate-doesnt-support-serialization-of-a-parameter-type-which-was-p
// Another: http://www.damirscorner.com/blog/posts/20120923-UsingSuspensionManagerForSavingApplicationState.html
// Bottom Line: Pass the Id; if Id == 0, create a new PlanetViewModel; if Id != 0, GetPlanet(id) and map to PlanetViewModel.
}
// PlanetVM -> Planet Mapper
// TODO: use AutoMapper instead https://github.com/AutoMapper/AutoMapper/wiki
private Planet MapPlanetVMToPlanet(PlanetViewModel planetVM) {
return new Planet {
Id = planetVM.Id,
Name = planetVM.Name,
ImagePath = planetVM.ImagePath,
Mass = planetVM.Mass,
Diameter = planetVM.Diameter,
Gravity = planetVM.Gravity,
LengthOfDay = planetVM.LengthOfDay,
DistanceFromSun = planetVM.DistanceFromSun,
OrbitalPeriod = planetVM.OrbitalPeriod,
MeanTemperature = planetVM.MeanTemperature,
NumberOfMoons = planetVM.NumberOfMoons
};
}
// Add AppBarButton
private void AddPlanet() {
SelectedPlanetVM = new PlanetViewModel();
navigationService.Navigate("PlanetAdd", SelectedPlanetVM);
}
// Add AppBarButton
private void AddPlanet() {
if (SelectedPlanetVM != null) {
saveSelectedPlanetId = SelectedPlanetVM.Id;
}
SelectedPlanetVM = new PlanetViewModel();
IsInEditMode = true;
RunAllCanExecuteChanged();
}
