Layered Architectures

Before understanding the reasons behind the creation and adoption of the MVC pattern, we need to understand how and why a well-structured application is organized in layers. The next section is dedicated to a short summary of layered architectures. Next, we will analyze the MVC pattern and its ASP.NET Core implementation in detail.

The different activities of a web application

All business applications, and, in general, all non-trivial web applications, perform three kinds of activities:

1. Interacting with the user to take their inputs and to return results. This activity is called Presentation.

2. Performing business-specific processing on data. For instance, a personnel management application computes salaries taxes, etc., while an E-Commerce application computes prices, discounts, and delivery plans. This activity is called Business.

3. Storing and retrieving information from long-term storage. This activity is assigned the Data label.

Since the above three activities involve different technologies, tools, and libraries it is strategic to make the code-base of each of them independent from the others. This goal can be achieved only by organizing the three code-bases into separate modules that communicate through well-defined ...