1. Presentation Layer (View)
The presentation layer, also known as the view, is responsible for displaying the user interface (UI) to the end-users. It interacts with the users and presents the data in a user-friendly manner. In the context of C# MVC, the view is typically implemented using HTML, CSS, and JavaScript.
The view layer is responsible for the following tasks:
- Rendering the UI elements and controls.
- Handling user input and events.
- Displaying data received from the controller.
2. Business Logic Layer (Controller)
The business logic layer, also known as the controller, acts as an intermediary between the view and the data layer. It processes the user's requests, performs necessary operations, and prepares the data to be displayed in the view. In C# MVC, the controller is implemented using C# code.
The controller layer is responsible for the following tasks:
- Receiving and validating user input.
- Coordinating the flow of data between the view and the model.
- Applying business rules and logic.
- Handling exceptions and errors.
3. Data Access Layer (Model)
The data access layer, also known as the model, is responsible for managing the data and interacting with the underlying data storage systems, such as databases or external APIs. It encapsulates the data-related operations and provides an interface for the controller to interact with the data. In C# MVC, the model is typically implemented using classes and data access technologies like Entity Framework.
The model layer is responsible for the following tasks:
- Retrieving and persisting data from/to the data storage.
- Performing data validation and transformation.
- Implementing business rules related to data manipulation.
- Providing an abstraction layer for the controller to interact with the data.
Benefits of Three-Layer Architecture in MVC
The three-layer architecture in MVC offers several benefits, including:
- Separation of concerns: Each layer has a specific responsibility, making the codebase more modular and easier to maintain.
- Scalability: The architecture allows for scaling individual layers independently, enabling better performance and resource utilization.
- Testability: With clear separation between layers, it becomes easier to write unit tests for each layer independently.
- Code reusability: The modular structure of the architecture promotes code reusability, as each layer can be used in different contexts or projects.
In conclusion, the three-layer architecture in MVC provides a structured approach to building applications, separating the presentation, business logic, and data access concerns. This separation improves maintainability, scalability, and testability of the application, making it a popular choice for software development projects.