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

WPF OpenFileDialog with the MVVM pattern? 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 Compared To MVC and MVP Saturday, November 21, 2009 6:53 PM At the recent Calgary Tech Days event I did a presentation on building composite applications with WPF and Silverlight. One question that I get asked frequently when I get to the part of explaining MVVM is how its different from patterns that seem too similar or identical, with MVC and MVP typically being the two common ones raised. Usually my answer is that MVVM is very similar to the others, but it implies *stuff* that’s specific to Silverlight and WPF (how binding works, commanding, etc.). So below I have a comparison, pointing out the key differences between the patterns and why MVVM *is* different. MVC – Model View Controller Let’s look at MVC first. The input is directed at the Controller first, not the view. There is a many-to-one relationship between the Controller and the View. Note the one way arrow from Controller to View. MVP – Model View Presenter Now let’s look at the MVP pattern. The input begins with the View, not the Presenter. Conclusion

wpf - Good examples of MVVM Template Open File Dialog MVVM 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]

Evaluation of MVVM « Zeeshan Amjad's WPF Blog Let’s take a look at MVVM from higher level and take a step by step approach to understand it. Here our discussion is based on complexity of the architecture from simple to complex, not from historical order. Probably the simplest design principle to separate the data from its presentation is Observer design pattern. In observer design pattern, we have two different classes for data (subject/model) or its presentation (observer/view). Subject class contain the instance of all of the observers and send notification to all of observers when there is any change in the data. The next step is to introduce middle layer in between data and its presentation. This approach has some advantages and disadvantages. MVVM is very similar to MVP pattern. Now let’s take a look at MVVM little bit more detail. This diagram explain how can we take advantage of MVVM. Like this: Like Loading...

Related:  Design