MVVM
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WPF and MVVM tutorial 01, Introduction.
With Microsoft WPF technology, a new pattern is born and is going to be called MVVM (Model View ViewModel). This pattern is an hybrid from the old MVC and the old MVP patterns. Why a new pattern for the presentation? First of all WPF technology is giving us a kind of technology that can completely change the approach to design and code the UI. With the VMMV we can completely design an agnostic UI that doesn’t know the Model we are going to pass to it.
In the first part of this tutorial we saw the MVVM model and how it works. In this part of our tutorial we will work directly with the Entity Model and LinqToSQL. I am using a database-first approach so in my opinion using LinqToSQL will be better then Entitiy Framework. I am going also to show you an easy way to build a custom Unit Of Work to manage the context status with Linq 2 SQL. The Visual Studio Project. First of all open a blank Visual Studio solution, I called it WPF.Tutorial.VMMV .
WPF and MVVM tutorial 02, The model.
WPF and MVVM tutorial 03, The user repository.
Before starting to view in depth our model, or to design the views, I want to complete the DAL layer. Now that we have our unit of work implementation and our data context we need to implement a couple of repositories. If you want to view how it should work a repository, I suggest this interesting article from Martin Fowler .WPF and MVVM tutorial 04, The Commands.
In the previous posts we saw the basic of our project, the model (domain entities) and a simple repository . Note: please note that the sample I wrote about an agnostic UnitOfWork is just to show you a simple pattern to handle L2S but it can be done better. The ViewModel. What is the view model?
As we saw in the previous posts, a view model should be an abstract implementation of what the view needs to show about the model. We should implement an observable collection of something, we should implement an INotifyPropertyChanged interface and we should have a collection of RelayCommands . For these reasons, it simply to understand that we need a basic abstract ViewModel class, just to recycle some code. The Basic View Model. 1: namespace MVVM.ViewModel { 2: public abstract class ViewModel:INotifyPropertyChanged,IDisposable {
WPF and MVVM tutorial 05, The basic ViewModel.
WPF and MVVM tutorial 06, start up form.
Today we are going to create the start-up form of our project and use the first ViewModel to run the application logic. The result we want to obtain will be: The View Model for the Startup form. In our project, let’s go to the ViewModel section and create a new class.
Ok, starting from this post we are going to do something really interesting. In this episode we need to create a simple List windows, but as you will see the logic will not be so different then a one-to-many form. This will be the final result: The ViewModel for the List Window. First of all we need to create the view model.
WPF and MVVM tutorial 07, the List search.
Jason Dolinger on Model-View-ViewModel » Lab49 Blog
A while back, Jason Dolinger, a consultant here at Lab49, gave us a presentation on design in WPF with the Model-View-ViewModel pattern and the Unity dependency injection framework. Jason started with an application that one would write in a “traditional” way, with button clicks handled by event-handlers in the code-behind that then updated other parts of the UI. Using WPF data-binding, Commands, and Unity, he transformed it, piece by piece, in a much more manageable, encapsulated, readable, and testable M-V-VM design. It was awesome. It was so awesome, in fact, that after the presentation Jason recorded the demo for all to see here . Check it out.
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.
MVVM for Tarded Folks Like Me
Model-View-ViewModel (MVVM) Explained
The purpose of this post is to provide an introduction to the Model-View-ViewModel (MVVM) pattern. While I've participated in lots of discussions online about MVVM, it occurred to me that beginners who are learning the pattern have very little to go on and a lot of conflicting resources to wade through in order to try to implement it in their own code. I am not trying to introduce dogma but wanted to pull together key concepts in a single post to make it easy and straightforward to understand the value of the pattern and how it can be implemented. MVVM is really far simpler than people make it out to be.