Understanding Model View Controller in ASP.NET MVC
The Model-View-Controller (MVC) pattern was introduced in the 1970s. It is a software design pattern that splits an application into three main aspects : Model, View and Controller. Moreover, MVC pattern forces a separation of concerns within an application for example, separating data access logic and business logic from the UI.
Model - The "M" in "MVC"
The Model represents a set of classes that describes the business logic and data. It also defines business rules for how the data can be changed and manipulated.
Moreover, models in Asp.Net MVC, handles the Data Access Layer by using ORM tools like Entity Framework or NHibernate etc. By default, models are stored in the Models folder of the project.
The Model can be broken down into several different layers as given below:
Objects or ViewModel Layer
This layer contains simple objects or complex objects which are used to specify strongly-typed view. These objects are used to pass data from controller to strongly-typed view and vice versa. The classes for these objects can have specific validation rules which are defined by using data annotations. Typically, these classes have those properties which you want to display on corresponding view/page.
Data Access Layer
This layer provides objects to access and manipulate the database of your application. Typically, this layer is made by using ORM tools like Entity Framework or NHibernate etc.
This layer helps you to implement your business logic and validations for your application. This layer make use of Data Access Layer for persisting data into database. Also, this layer is directly invoked by the Controller to do processing on input data and sent back to view.
View - The "V" in "MVC"
The View is responsible for transforming a model or models into UI. The Model is responsible for providing all the required business logic and validation to the view. The view is only responsible for displaying the data, that is received from the controller as the result.
Moreover, views in Asp.Net MVC, handles the UI presentation of data as the result of a request received by a controller. By default, views are stored in the Views folder of the project.
Controller - The "C" in "MVC"
The Controller is responsible for controlling the application logic and acts as the coordinator between the View and the Model. The Controller receive input from users via the View, then process the user's data with the help of Model and passing the results back to the View.
Moreover, controllers in Asp.Net MVC, respond to HTTP requests and determine the action to take based upon the content of the incoming request. By default, controllers are stored in the Controllers folder of the project.
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