MVVM

Here is a glossary of 50 terms related to the MVVM (Model-View-ViewModel) architectural pattern:

1. MVVM: Model-View-ViewModel, an architectural pattern used in software development to separate the concerns of user interface (View), business logic and data (Model), and the intermediary between them (ViewModel).

2. Model: Represents the data and business logic of an application. It encapsulates the application's state and behavior, often interacting with data sources and performing data manipulation.

3. View: The user interface (UI) component of an application that displays the data and interacts with the user. It is responsible for presenting information and capturing user input.

4. ViewModel: Acts as an intermediary between the View and Model, exposing data and behavior to the View while encapsulating the application logic. It abstracts the View's state and provides data bindings for synchronization.

5. Data Binding: A mechanism that establishes a connection between the ViewModel and the View, allowing automatic synchronization of data changes without manual intervention.

6. Two-Way Binding: A type of data binding that allows changes in the ViewModel to update the View and vice versa, ensuring data consistency in both directions.

7. One-Way Binding: A type of data binding that propagates data changes from the ViewModel to the View but does not synchronize changes back from the View to the ViewModel.

8. Commands: Encapsulated actions defined in the ViewModel that can be invoked by the View, such as button clicks or menu selections.

9. Dependency Injection: A design pattern in which the dependencies of a class (such as the ViewModel) are provided externally, allowing for loose coupling and easier unit testing.

10. Observable Object: A class or data structure that notifies subscribers when its internal state changes, typically used in the ViewModel to implement data bindings and update the View.

11. Property Changed Event: An event raised by an Observable Object to notify subscribers (usually the View) that a property's value has changed.

12. Event Aggregator: A component that facilitates communication between different parts of an application by collecting and distributing events among subscribers.

13. Data Validation: The process of ensuring that the data entered by the user or received from external sources meets certain predefined criteria or rules.

14. Data Conversion: The transformation of data between different formats or representations, often required when binding data between the ViewModel and the View.

15. Mediator: A pattern that allows communication between multiple objects without them having direct references to each other. The ViewModel acts as a mediator between the View and the Model.

16. View Services: Services or utilities that are specific to the View and assist in implementing specific UI-related functionality, such as dialog boxes or user notifications.

17. Model Services: Services or utilities that are specific to the Model and handle tasks related to data access, manipulation, or external API interactions.

18. Routing: The process of mapping URLs or user navigation actions to specific Views and ViewModels, allowing for the dynamic presentation of different screens or pages.

19. Data Template: A reusable template used by the View to define the presentation of data items, such as a list or a grid.

20. UI Composition: The process of combining multiple smaller Views into a larger, more complex UI structure, allowing for modular and reusable UI components.

21. Design-Time Data: Dummy data provided during development to simulate the behavior and appearance of data-bound controls in the design environment.

22. INotifyPropertyChanged: An interface in MVVM frameworks that allows ViewModel properties to notify the View of changes through the Property Changed Event.

23. ICommand: An interface used to define commands in the ViewModel that can be bound to UI elements in the View, enabling interaction between the user and the ViewModel.

24. Data Access Layer: A layer in the application architecture responsible for interacting with data sources, such as databases or web services, to retrieve and manipulate data.

25. View Composition: The process of combining multiple Views into a single View, often used to build complex UI layouts.

26. Behaviors: Encapsulated reusable pieces of functionality that can be attached to UI elements in the View, enabling additional interactivity and custom logic.

27. Relay Command: A specialized implementation of the ICommand interface that simplifies the implementation of commands in the ViewModel.

28. Messenger: A communication mechanism that enables decoupled communication between ViewModels by sending and receiving messages or events.

29. Service Locator: A pattern that provides a centralized registry for locating and retrieving services or dependencies needed by the ViewModel.

30. Design Patterns: Reusable solutions to common software design problems that facilitate the development of reliable, maintainable, and scalable applications.

31. View-State Management: The process of preserving and restoring the state of the View during navigation or configuration changes, ensuring a seamless user experience.

32. ViewModel-First Navigation: A navigation pattern where the ViewModel is responsible for initiating navigation to a specific View.

33. View-First Navigation: A navigation pattern where the View triggers the navigation to a specific ViewModel or another View.

34. Design-Time ViewModel: A separate ViewModel implementation used during design or development to provide design-time data and facilitate UI design.

35. Services: Reusable components or modules that provide specific functionality or perform specific tasks, such as logging, authentication, or network communication.

36. Data Binding Expressions: Expressions used in the View to specify how ViewModel properties should be bound to UI elements.

37. UI Automation Testing: The process of automating tests to verify the correctness and functionality of the user interface, often achieved using testing frameworks and tools.

38. ViewModel Locator: A component that manages the creation and retrieval of ViewModels, providing a centralized way to access and instantiate ViewModel instances.

39. Validation Rules: Predefined criteria or conditions that data must satisfy to be considered valid, often implemented in the ViewModel to enforce data integrity.

40. Threading: The management of multiple threads of execution in an application, ensuring that UI updates and long-running operations are properly handled in the ViewModel.

41. Commands Routing: The process of propagating commands from the View to the ViewModel, enabling actions in nested or child Views to be handled by their respective ViewModels.

42. Design-Time Controls: Custom controls or extensions provided by MVVM frameworks to enhance the design-time experience of the View.

43. View Composition Containers: Components or patterns used to manage the dynamic composition and lifecycle of multiple Views in the UI.

44. Expression Blend: A design tool commonly used in XAML-based MVVM frameworks to visually design and

 style the user interface.

45. Service Injection: The process of injecting dependencies or services into the ViewModel or other components, often accomplished through the use of a dependency injection container.

46. Messenger Service: A dedicated service or component responsible for facilitating message-based communication between ViewModels.

47. Mocking Framework: A tool or library used to create mock objects for unit testing, allowing the simulation of dependencies or external services in ViewModel tests.

48. Design-Time Attributes: Annotations or attributes applied to ViewModel properties to provide additional metadata or instructions to design-time tools or editors.

49. Asynchronous Operations: Operations that execute independently of the UI thread, often used in the ViewModel to perform time-consuming tasks without blocking the user interface.

50. Debugging Tools: Tools and features provided by development environments or MVVM frameworks to assist in debugging and diagnosing issues in the ViewModel or View.