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MVVM for Tarded Folks Like Me

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. 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 ! if (changed ! Grid > Related:  MVC and Variants

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. 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 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. 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 Partial Public Class ServerExplorerConnectView End Class VB.NET – Compromise, but works

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. MVVM virtually eliminates all of the code that would typically be placed in the code-behind file of your View (a user control, a screen, whatever) by putting all of that logic in the ViewModel. 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. Without MVVM, all of these would be taken care of in the View. View: ViewModel:

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. 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 Project The solution consists of three projects. Shows the project structure

Model View ViewModel MVVM facilitates a clear separation of the development of the graphical user interface (either as markup language or GUI code) from the development of the business logic or back end logic known as the model (also known as the data model to distinguish it from the view model). The view model of MVVM is a value converter[4] meaning that the view model is responsible for exposing the data objects from the model in such a way that those objects are easily managed and consumed. In this respect, the view model is more model than view, and handles most if not all of the view’s display logic (though the demarcation between what functions are handled by which layer is a subject of ongoing discussion[5] and exploration). The view model may also implement a mediator pattern organising access to the backend logic around the set of use cases supported by the view. History[edit] Microsoft MVP Josh Smith reported[6] that A notable Javascript implementation of this pattern is Knockout.js. Timeline[edit]

MVVM Explained 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. 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. public interface IModel { void setAdapter(IModelAdapter a); object M(object input); } public interface IView { void setAdapter(IViewAdapter a); void V(); } public interface IModelAdapter { void V(); // Any functions the model needs to call to be propogated to the view }

The Open Graph Protocol 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. 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. DataTemplates

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). To me, this means that the three aspects (I'll call them tiers) are totally encapsulated, and that the tiers should be completely replaceable and testable on their own. The View should not call the Controller, the Controller should not set up the underlying display framework to interact with the View, and the Data should not care about how it's consumed. 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

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. 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] La description d'un patron de conception suit un formalisme fixe : Ci-dessous, les 23 patrons GoF : Adapter Bridge

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