public MenuViewModel(IUserRepository userRepository)
{
if (userRepository == null)
throw new ArgumentNullException("userRepository");
_userRepository = userRepository;
Menu = new ReactiveList<MenuOptionViewModel>();
// Use WhenAny to observe one or more values
var canLoadMenu = this.WhenAny(m => m.User, user => user.Value != null);
// hook function to command, shouldn't contain UI/complex logic
LoadMenu = ReactiveCommand.CreateAsyncTask(canLoadMenu, _ => _userRepository.GetMenuByUser(User));
// RxApp.MainThreadScheduler is our UI thread, you can go wild here
LoadMenu.ObserveOn(RxApp.MainThreadScheduler).Subscribe(menu =>
{
Menu.Clear();
foreach (var option in menu)
{
var menuOption = new MenuOptionViewModel(option);
Menu.Add(menuOption);
}
});
LoadMenu.ThrownExceptions.Subscribe(ex =>
{
Menu.Clear();
MessageBox.Show(ex.Message);
});
// Use WhenAnyValue to check if a property was changed
// If user was changed reload menu
this.WhenAnyValue(m => m.User).InvokeCommand(this, vm => vm.LoadMenu);
}
public MenuViewModel(IUserRepository userRepository)
{
if (userRepository == null)
{
throw new ArgumentNullException("userRepository");
}
_userRepository = userRepository;
Menu = new ReactiveList <MenuOptionViewModel>();
// Use WhenAny to observe one or more values
var canLoadMenu = this.WhenAny(m => m.User, user => user.Value != null);
// hook function to command, shouldn't contain UI/complex logic
LoadMenu = ReactiveCommand.CreateFromTask <User, IList <Menu> >(async user => await _userRepository.GetMenuByUser(User),
canLoadMenu);
// RxApp.MainThreadScheduler is our UI thread, you can go wild here
LoadMenu.ObserveOn(RxApp.MainThreadScheduler).Subscribe(menu =>
{
Menu.Clear();
foreach (var option in menu)
{
var menuOption = new MenuOptionViewModel(option);
Menu.Add(menuOption);
}
});
LoadMenu.ThrownExceptions.Subscribe(ex =>
{
Menu.Clear();
MessageBox.Show(ex.Message);
});
// Use WhenAnyValue to check if a property was changed
// If user was changed reload menu
this.WhenAnyValue(m => m.User).InvokeCommand(this, vm => vm.LoadMenu);
}