What is .NET 3-Tier Architecture?
3-tier architecture is a software design pattern that divides an application into three logical and physical tiers: the presentation tier, the application tier, and the data tier.
The presentation tier is responsible for displaying the user interface and collecting user input. The application tier contains the business logic of the application, such as validation, calculation, and persistence. The data tier is responsible for storing and retrieving data from a database or other data source.Benefits of using 3-tier architecture in C#:
- Improved separation of concerns: 3-tier architecture helps to improve the separation of concerns by dividing the application into three distinct tiers. This makes the application easier to design, develop, and maintain.
- Improved scalability: 3-tier architecture makes it easier to scale the application by allowing you to scale each tier independently.
- Improved security: 3-tier architecture can help to improve security by isolating the data tier from the other tiers. This makes it more difficult for attackers to gain access to sensitive data.
3-tier architecture can be implemented in any programming language, including C#. To implement 3-tier architecture in C#, you would typically use a layered architecture. This means that each tier would be implemented as a separate layer, and the layers would communicate with each other through well-defined interfaces.
The Presentation Layer is responsible for handling user interactions, displaying information to users, and receiving user inputs. It typically consists of user interfaces (UI), such as web pages, desktop applications, or mobile app screens. This layer should focus on presenting data to the user and collecting user inputs. It should not contain business logic or direct database access.Example (ASP.NET MVC Controller):
Business Logic Tier
The Business Logic Layer (also known as the Application Layer) is responsible for implementing the application's business rules, logic, and workflows. It serves as an intermediary between the Presentation Layer and the Data Access Layer, ensuring that data is processed correctly and consistently. This layer encapsulates business logic, performs data validation, and orchestrates interactions with the Data Access Layer.Example (C# Business Logic Class):
Data Access Tier
The Data Access Layer is responsible for interacting with the data storage, such as a database or external APIs. It encapsulates data access operations like querying, inserting, updating, and deleting data. This layer abstracts the details of data storage and retrieval, ensuring data integrity and security.Example (C# Data Access Class with Entity Framework):
In a 3-Tier Architecture, these layers work together to maintain a clear separation of concerns, making the application more maintainable, scalable, and testable. The Presentation Layer focuses on the user interface, the Business Logic Layer handles business rules, and the Data Access Layer deals with data storage, ensuring a well-organized and modular codebase.Example | 3-tier architecture implementation in C#
Here is a complete source code example of a simple 3-tier architecture implementation in C#:
In this example, the CustomerForm class represents the presentation tier. The CustomerService class represents the application tier. The CustomerRepository class represents the data tier.
To use the 3-tier architecture, you would simply create an instance of the CustomerForm class and call its LoadCustomerById() or SaveCustomer() method. The CustomerForm class would then communicate with the CustomerService class to get or save the customer information. The CustomerService class would then communicate with the CustomerRepository class to get or save the customer information from the database.
The 3-Tier Architecture in C# is an architectural pattern that divides an application into three distinct layers: Presentation, Business Logic, and Data Access. The Presentation Layer handles user interfaces, the Business Logic Layer manages application rules and workflows, and the Data Access Layer deals with data storage and retrieval, promoting modular, maintainable, and scalable software design.