.net core mvc visual studio code tutorial

The controller's GET method creates an instance of the view model (or has one injected) and passes it as the model to the page. Of course, there can be exceptions, but this separation keeps your controllers and view model classes small and focused. In MVC, you do the same by having one view model class per page. When using MVVM in WPF, you typically have a view model class for each screen. To ensure reusability of your view model classes, don't use any ASP.NET objects such as Session, ViewBag, TempData, etc. Normally, properties that don't need to be set as view model properties will be bound to controls on your user interface.

The controller should only call a method in your view model, and periodically set a property or two prior to calling that method. The key to MVVM in MVC is moving logic out of the MVC controller and into a view model class that contains properties that you can bind to the user interface. Wrapping all variables and logic that operates upon those variables into one class allows you to create a set of tests to check each property and method in the class quickly and easily.Īny other classes using the class automatically get the fix. When you don't use global variables in an application, testing your application becomes much simpler. Maintaining logic in classes allows you to fix any bugs in just one place and any other classes using that class automatically get the fix.

Wrapping the logic of your application into small, stand-alone classes allows you to reuse those classes in many different applications. The reasons programmers are adopting the MVVM design pattern are the same reasons programmers adopted Object Oriented Programming (OOP) over 30 years ago: separation of concerns, reusability, maintainability, and testability. Use the MVVM Design Pattern in MVC Core: Part 3 The Model-View-View-Model Approach Use the MVVM Design Pattern in MVC Core: Part 2 You're going to be guided step-by-step building an MVC Core application using the Entity Framework (EF) and a view model class to display and search for product data. This article illustrates how using MVVM in MVC makes your applications even more reusable, testable, and maintainable. The MVVM approach has long been used in WPF applications but hasn't been as prevalent in MVC or MVC Core applications. This 3-part article series presents how to use the Model-View-View-Model (MVVM) design pattern in MVC Core applications.

.net core mvc visual studio code tutorial