WPF Conventions

MVVM

• Strict MVVM: View (XAML + code-behind for view-only logic), ViewModel (state + commands), Model (domain).
• View knows ViewModel; ViewModel does not know View. No Window, UserControl, Dispatcher, or visual-tree types in ViewModels.
• ViewModels expose data via properties implementing INotifyPropertyChanged and commands via ICommand.
• Use CommunityToolkit.Mvvm for ObservableObject, [ObservableProperty], [RelayCommand] source generators. No hand-rolled boilerplate.
• Command orchestration beyond [RelayCommand] - undo/redo stacks, command queues, snapshots - routes to personal-csharp-design-patterns (Command, Memento, Observer in plain C#).
• Navigation goes through an INavigationService (ViewModel-side); never new Window().Show() from a ViewModel.

Naming

• View: OrderListView.xaml / OrderListView.xaml.cs.
• ViewModel: OrderListViewModel.cs.
• View and ViewModel paired by convention, located in the same feature folder.