In the MVVM pattern, the view encapsulates the UI and any UI logic, the view model encapsulates presentation logic and state, and the model encapsulates business logic and data.The view interacts with the view model through data binding, commands, and change notification events.
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It has no direct reference to the view or any knowledge about the view's specific implementation or type.
The view model implements properties and commands to which the view can data bind and notifies the view of any state changes through change notification events.
In some cases, the code-behind may contain UI logic code that implements visual behavior that is difficult or inefficient to express in Extensible Application Markup Language (XAML), such as complex animations, or when the code needs to directly manipulate visual elements that are part of the view.
You should not put any logic code in the view that you need to unit test.
It can also greatly improve code re-use opportunities and allows developers and UI designers to more easily collaborate when developing their respective parts of the application.
Using the MVVM pattern, the UI of the application and the underlying presentation and business logic is separated into three separate classes: the view, which encapsulates the UI and UI logic; the view model, which encapsulates presentation logic and state; and the model, which encapsulates the application's business logic and data.The Model-View-View Model (MVVM) pattern helps you to cleanly separate the business and presentation logic of your application from its user interface (UI).Maintaining a clean separation between application logic and UI helps to address numerous development and design issues and can make your application much easier to test, maintain, and evolve.The topic Advanced MVVM Scenarios describes how to implement more advanced MVVM scenarios using the Prism Library.The MVVM pattern is a close variant of the Presentation Model pattern, optimized to leverage some of the core capabilities of WPF , such as data binding, data templates, commands, and behaviors.These features embody the most common practices for implementing the MVVM pattern and are designed to support testability and to work well with Expression Blend and Visual Studio.