ASP NET Core MVC Framework
The View component is used for all the UI logic of the application. Views are created by the data which is collected by the model component but these data aren’t taken directly but through the controller. In this lab we will create a simple customer data entry screen as shown in the below figure using an MVC template.
In the MVC design pattern, the Model component also contains the required logic in order to retrieve the data from a database. Once the model is created by the controller, then the controller selects a view to render the domain data or model data. While selecting a view, it is also the responsibility of the controller to pass the model data. The controller is the MVC design pattern component that handles the incoming request. In order to handle the request, the controller components do several things, as follows. The controller component creates the model that is required by a view.
It responds to the controller’s request because the controller can’t interact with the database by itself. The model interacts with the database and gives the required data back to the controller. The controller receives user input and makes calls to model objects and the view to perform appropriate actions.
So, the three major components of an ASP.NET Core MVC Application are Model, View, and Controller. Let us discuss each of these components of the MVC design pattern in detail. A View is that part of the application that represents the presentation of data. The advantage of creating a strong how to become a .net mvc developer typed view is you can now get the properties of the class in the view by typing the model and “.” as shown in the below figure. The problem with using the ASP.NET session or view state object is the scope. ASP.NET session objects have session scope and view state has page scope.
Lab 5: Using HTMLHelper to create views faster
Go to the controllers folder , right on click and click the controller menu as shown in the below figure. Let’s spend some time in understanding the solution created. The first thing you will notice is that there are lot of folders created, see the below figure.
The answer, you see, is to set up a notifications system, providing
the Model layer with a place it can announce to no-one in particular
that it has just done something interesting. Other layers can then
post listeners with that notification system to listen for those
announcements that they’re actually interested in. The Model layer
doesn’t need to know anything about who’s listening (or even if anyone
is listening at all!); it just posts an announcement and then forgets
about it. And if anyone hears that announcement and feels like doing
something afterwards – like asking the Model for some new data so it
can update its on-screen display – then great. The Model just lists
what notifications it sends as part of its API definition; and what
anyone else does with that knowledge is up to them.
So what’s in the next lab?
So, in short, we can say that a Model in the MVC Design Pattern contains a set of classes used to represent the data and the logic to manage those data. In our example, the Student class is the class https://remotemode.net/ that is used to represent the data. The StudentBusinessLayer class is the class that is used to manage the Student data, i.e., Validating the Data and Persisting the data into the database.
As view does not know nothing about activity, similarly activity knows nothing about the actual presentation. We (the programmers) could rearrange the layout of the view multiple times, without changing even one line of code in our activity. Conversely, a view should never know about user input, such as mouse operations and keystrokes. It should always be possible to write a method in a controller that sends messages to views which exactly reproduce any sequence of user commands. It provides the user with input by arranging for relevant views to present themselves in appropriate places on the screen. It provides means for user output by presenting the user with menus or other means of giving commands and data.