background preloader

THE MODEL-VIEW-VIEWMODEL (MVVM) DESIGN PATTERN FOR WPF

THE MODEL-VIEW-VIEWMODEL (MVVM) DESIGN PATTERN FOR WPF
Patterns WPF Apps With The Model-View-ViewModel Design Pattern Josh Smith Developing the user interface of a professional software application is not easy. It can be a murky blend of data, interaction design, visual design, connectivity, multithreading, security, internationalization, validation, unit testing, and a touch of voodoo. There are popular design patterns that can help to tame this unwieldy beast, but properly separating and addressing the multitude of concerns can be difficult. It is not always the design patterns at fault. As the software world continues to adopt WPF at an increasing rate, the WPF community has been developing its own ecosystem of patterns and practices. By the end of this article, it will be clear how data templates, commands, data binding, the resource system, and the MVVM pattern all fit together to create a simple, testable, robust framework on which any WPF application can thrive. Order vs. The Evolution of Model-View-ViewModel The Demo Application Related:  MVC and Variants

MVVM for Tarded Folks Like Me MVVM has been a trending topic lately. And why shouldn’t it be? People want to build great WPF/SL applications and want guidance on how to build them using the framework’s strengths. If you are anything like me, you started your WPF/SL career, learning the framework classes and hierarchy. You learned XAML, triggers, storyboards and animations. I’m going to go out on a limb and make a wild assumption. Beginner’s MVVM Challenge #1 |or| Takin’ You Down to MVVM Town So we want to begin our journey into MVVM town by way of Bindingopolis. A model is a class that has your data. class Model public string Name { get; set; } public string Address { get; set; } A view is, for the sake of explanation, is a UserControl. /// Interaction logic for View.xaml public partial class View : UserControl public View() InitializeComponent(); A View-Model is, again, just another class. class ViewModel : INotifyPropertyChanged private Model m_model; public ViewModel() m_model = new Model(); public string Name set Grid >

Patron de conception Un article de Wikipédia, l'encyclopédie libre. Pour les articles homonymes, voir Patron. En informatique, et plus particulièrement en développement logiciel, un patron de conception (en anglais : design pattern) est un arrangement caractéristique de modules, reconnu comme bonne pratique en réponse à un problème de conception d'un logiciel. Il décrit une solution standard, utilisable dans la conception de différents logiciels[1]. Les patrons de conception décrivent des procédés de conception généraux et permettent en conséquence de capitaliser l'expérience appliquée à la conception de logiciel. Les types de patrons[modifier | modifier le code] Les patrons de conception ne sont ni des patrons d'architecture ni des idiotismes de programmation. Description[modifier | modifier le code] Les patrons servent à documenter des bonnes pratiques basées sur l'expérience. Histoire[modifier | modifier le code] Citations[modifier | modifier le code] Formalisme[modifier | modifier le code] Adapter Bridge Builder

MVVM for Dummies I think that I have found one of the best articles on MVVM that I have ever read: This article sums up what is in MVVM and what is outside of MVVM. Note, when I and most other people say MVVM, they really mean MVVM, Commanding, Dependency Injection + any other Patterns you need to create your application. In WPF a lot of use is made of the Decorator and Behaviour pattern as well. C# – Ideal public partial class IdealView : UserControl { public IdealView() { InitializeComponent(); } } Figure: This is the ideal code behind for a Control / Window / Page when using MVVM. C# – Compromise, but works public partial class IdealView : UserControl { public IdealView() { InitializeComponent(); this.DataContext = new IdealViewModel(); } } Figure: This is a compromise, but the best you can do without Dependency Injection VB.NET – Ideal VB.NET – Compromise, but works

Model View Presenter explained I have used Model View Presenter (MVP) a lot the last months. It's a great pattern, but a lot of the people I talk to have problem understanding how it works, and how to use it. I will try to explain it simple in this blog post. Passive View and Supervising controller The creator of MVP, Martin Fowler, spilt the pattern into to new patterns. This was due to apparent confusions between Model View Controller and MVP. When to use it MVP is a great pattern to ease up unit testing the graphical user interface (GUI), and to decouple the GUI from the underlying model. Explained graphically MVP is a pursuance of an other pattern called Model View Controller. The figure below visually illustrates the pattern. More thoroughgoing, this is what happens: 1) The user executes a action. There are normally four main classes used in the MVP pattern. Example application I have created an application witch displays name, e-mail, state, etc. Shows the GUI in the application Shows the project structure

Binding Un article de Wikipédia, l'encyclopédie libre. Un binding ou liaison (qui est un terme anglais désignant l'action de lier des éléments entre eux) peut avoir plusieurs significations en informatique : Binding de langage[modifier | modifier le code] Nombre de bibliothèques sont écrites dans des langages proches de la machine comme le C ou le C++. Pour utiliser ces bibliothèques dans un langage de plus haut niveau, il est donc nécessaire de réaliser un binding. La conception d'un binding peut être motivée par le fait de profiter des performances offertes par l'utilisation d'un langage bas niveau que l'on ne peut obtenir avec un langage de plus haut niveau. XML data binding[modifier | modifier le code] Le fait de représenter un document XML sous forme d'objet simplifie sa manipulation lors du développement d'un logiciel. Data binding[modifier | modifier le code]

WPF Tutorial Primary Objects - Using the Model View Controller Pattern in C# ASP .NET Web Applications What is a View? The View in the MVC design pattern represents the display functionality of the web application. The View controls how to display data, drawing controls, writing text, getting input from the user, outputting results, etc. Since a C# ASP .NET web application usually involves showing something to the user, retrieving input, processing the input, and displaying the results, you can see how the View directly interacts with the Model to perform the applications functionality. What is a Controller? The Controller can be considered the middle-man between the Model and View. The Controller takes a View and a Model in its contructor in order to setup the linking between the Model and View. Now that you have an idea of what each part on the model view controller design pattern entails, we can begin setting up the framework code to use this pattern. Four Interfaces Seem Like a Lot This design pattern actually begins with 2 interfaces to represent the Model and View. return name; }

MVVM Light Toolkit Introduction The main purpose of the toolkit is to accelerate the creation and development of MVVM applications in WPF, Silverlight, Windows Store (RT) and for Windows Phone. The MVVM Light Toolkit helps you to separate your View from your Model which creates applications that are cleaner and easier to maintain and extend. It also creates testable applications and allows you to have a much thinner user interface layer (which is more difficult to test automatically). This toolkit puts a special emphasis on the "blendability" of the created application (i.e. the ability to open and edit the user interface into Blend), including the creation of design-time data to enable the Blend users to "see something" when they work with data controls. Documentation There is documentation about the MVVM pattern and the MVVM Light Toolkit available here. Installation and Creation The MVVM Light Toolkit installation procedure (for the full package) is described here. Source code and Codeplex Support Donate

MVC (Model View Controller) for Real World Development There's tons of hype around from Microsoft's ASP.Net MVC framework, but the fact is that it's not a true MVC, it DOES care about the presentation technology and that's a real problem. The reality is that the MVC pattern itself is grossly misinterpreted by most people, and a true MVC pattern is easily attainable. What is MVC? The MVC pattern is intended to provide true separation between the Model (data), View (presentation) and Controller (business rules). What's Missing? To truly implement the MVC pattern you need to completely isolate the Controller and Model from the presentation framework. Using the Adapter Pattern in MVC The MVC is typically seen as three objects, an interface defining the View, a class defining the Model, and a class defining the Controller. To work around this problem we need to introduce a fourth object to the MVC pattern: The Controller Adapter.

Related: