Jer's One Stop Shop > Home - MVVM for Tarded Folks Like Me *or* MVVM and What it Means to 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. 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 get { return m_model.Name; } set if (m_model.Name ! m_model.Name = value ; InvokePropertyChanged( "Name" ); public event PropertyChangedEventHandler PropertyChanged; if (changed !
Blog.Rees.Biz: Mvvm Pattern Overview: MVVM stands for Model-View-ViewModel. This is a variation of the MVC pattern, and although MVVM has a controller like component called the ViewModel, I personally find it easier to still call this the controller. The basic premise of any derivative of the MVC Pattern. The main idea of MVVM is to take full advantage of WPF Data-Binding to allow very loose coupling between the Controller and the View. More Info Links: Here's a quick reference list of resources on the WPF MVVM pattern. Here's a diagram from Karl Shifflett giving a good overview of what each component of the MVVM model contains: Coupling Between Views and Controllers There are two schools of thought on how exactly to link your views to your controllers. The Purist Loose Couple Approach Following the loose coupling purist path neither the views nor the controllers have links to each other. The code before: 9 var window = new MainWindow(); 10 var viewModel = new MainWindowViewModel("Data/customers.xml"); 15 window.Close();
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. The goal of all of this is to have pure separation of concerns. 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
MVVM Explained The Open Graph Protocol The MVVM Pattern Is Highly Overrated Update: check out my MVP In Silverlight/WPF series which discusses the MVP approach as an alternative to MVVM If you're doing Silverlight or WPF, you've no doubt come across the MVVM (Model-View-ViewModel) pattern. It seems to be the most popular client-side architecture pattern used among Silverlight/WPF developers. I find the pattern to be highly overrated, and actually have some big issues with the whole thing. First, let's briefly cover what MVVM is about for those of you who don't know yet. The ViewModel typically contains properties for the data that is to be shown in the View, and also raises notification events when the data in those properties changes. That is, in a nutshell, how the MVVM pattern works. In most (if not all) MVVM implementations, a ViewModel has many possible reasons to be changed. Without MVVM, all of these would be taken care of in the View. Now, with MVVM, a lot of people would divide these concerns and responsibilities like this: View: ViewModel: Presenter:
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. Ils ont une influence sur l'architecture logicielle d'un système informatique. 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] Adapter Bridge Builder
MVVM Pattern Made Simple Download source - 123.66 KB Important Note Friends, I would very much appreciate if you leave me a line or two in the comments section stating how you think this article can be improved and what other topics on MVVM you want me to cover. Thanks. Introduction As many companies are switching from WinfForms to WPF/Silverlight, several project managers recently asked me almost identical questions about MVVM: What is MVVM Pattern? The purpose of this article is to answer these questions and to explain the MVVM pattern in the simplest possible way. I assume that the article readers have not had any previous exposure to the MVVM pattern but have some knowledge of WPF or Silverlight. Time permitting, I plan to write more MVVM articles which will include comparison of different MVVM frameworks and introduce a new MVVM framework. MVVM Overview Model is a set of classes representing the data coming from the services or the database. WPF Bindings These properties serve as the source properties.
LE MOTIF Model-View-ViewModel DESIGN (MVVM) pour 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. 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. It is unnecessary and counterproductive to use design patterns in a simple "Hello, World!" Developers often intentionally structure their code according to a design pattern, as opposed to letting the patterns emerge organically.
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.). Unfortunately without concrete demonstrations of implementing the different patterns, its sometimes hard to verbally get across. 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. MVP – Model View Presenter Conclusion
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++. 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] Le data binding est notamment utilisé dans le patron de conception Modèle-Vue-Contrôleur (MVC), pour faire communiquer le modèle avec la vue.
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. 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...
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