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).
Blog.Rees.Biz: Mvvm Pattern. Overview: MVVM Explained. Build Your Own MVVM Framework. 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. 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. You even hobbled together something that looked mind blowing, but the code was a monstrosity. 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. 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. 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: 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. Considering that a user interface exposes the underlying system and must satisfy the unpredictable stylistic requirements of its users, it can be the most volatile area of many applications. 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. Order vs. It is unnecessary and counterproductive to use design patterns in a simple "Hello, World! " Figure 1 Workspaces. 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. 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. WPF patterns : MVC, MVP or MVVM or…? Introduction Since XAML things have become a bit complicated in trying to conceptualize MVC architectures for Windows applications.
The gap between web and win is narrowing and the whole WPF thing adds diverse possibilities to one's toobox.