Satisfactory factory design12/7/2022 ![]() To help enforce a strict separation between the Model, View and ViewModel layers, I like to build each layer as a separate Visual Studio project. In addition, decoupling between View and ViewModel also allows the ViewModel to be more unit testable and reusable. This allows the interaction designers and graphics artists to create beautiful, functional UIs on top of the ViewModel while working closely with the developers to design a suitable ViewModel to support their efforts. However, it’s an important part of the MVVM design pattern that the ViewModel knows nothing about the View. You build the ViewModel knowing how the user will interact with the application at a high level. These are excellent goals, although for pragmatic reasons they’re sometimes broken. The two primary goals of the ViewModel are to make the Model easily consumable by the WPF/XAML View and to separate and encapsulate the Model from the View. The Model was the core of the application, and a lot of effort went into designing it according to object-oriented analysis and design (OOAD) best practices.įor me the Model is the heart of the application, representing the biggest and most important business asset because it captures all the complex business entities, their relationships and their functionality. Model, ViewModel and ViewĮvery WPF and Silverlight application I’ve worked on so far had the same high-level component design. I’ll also walk you through some concrete examples of using ViewModel as a document manager for exposing Model objects in the View layer. In this article I’ll explain how the ViewModel works, and discuss some benefits and issues involved in implementing a ViewModel in your code. #Satisfactory factory design code#When is the MVVM design pattern applicable, and when is it unnecessary? How should the application be structured? How much work is the ViewModel layer to write and maintain, and what alternatives exist for reducing the amount of code in the ViewModel layer? How are related properties within the Model handled elegantly? How should you expose collections within the Model to the View? Where should ViewModel objects be instantiated and hooked up to Model objects? While MVVM is a really useful pattern, it’s still relatively young and misunderstood. It’s both a powerful tool for building applications and a common language for discussing application design with developers. ![]() ![]() The Model-View-ViewModel (MVVM) design pattern describes a popular approach for building WPF and Silverlight applications. Where do you start? And what is the right way to compose your application? #Satisfactory factory design windows#Windows Presentation Foundation (WPF) and Silverlight provide rich APIs for building modern applications, but understanding and applying all the WPF features in harmony with each other to build well-designed and easily maintained apps can be difficult. Volume 25 Number 07 Design Patterns - Problems and Solutions with Model-View-ViewModel ![]()
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