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POI have some questions about MVVM pattern
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  1. POI have some questions about MVVM pattern
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    copied!<p>My name is Jesús from Spain, I'm a .NET developer and I just discovered this great web few days ago.</p> <p>I have some questions about the MVVM pattern and I will be glad if you can answer them.<br /> I started using WPF three months ago and I've learned the MVP pattern.<br /> MVP is so good because you can structure the application so well.</p> <p>I started seeing MVVM everywhere, but everyone is using the pattern by his own method.<br /> Every blogger is talking about MVVM in their WPF's blogs but every implementation is distinct.</p> <p>I'm focused now with the implementations that use the MVVM toolkit on CodePlex, but I have questions and I can't find too much information.</p> <p>I think that MVVM is a variation of MVP.<br /> With MVP every view has a presenter that does the view's job.<br /> In MVVM it's the same thing but using commands whenever you can.</p> <p>I also saw that if you need an event, it's like with MVP; delegating the event to the presenter / View-Model, that is if it's not a job for the view (such as updating the UI).</p> <p>On the other hand, the View-Model doesn't has a View reference so I have to play harder with data-bindings.<br /> You have to use the DelegateCommands (that are the same thing as RelayCommands, right?).</p> <p>Uhm... more questions... Is it safe to use the same View-Model with two views / user-controls?</p> <p>Oh... I ran into a problem yesterday when I was playing MVVM.<br /> I created a <code>CommandReference</code> of my command for the key-binding thing and I assigned this reference to the command property of my button, well, the <code>CanExecuted</code> worked the first time but it didn't update the <code>IsEnabled</code> property when the <code>CanExecuted</code> was true. I fixed it by binding the command directly to the button and not using the reference. The question is: Why some code is linking the reference to the objects and why other code is binding the command directly?</p> <p>What things related with MVVM should I learn? (I saw something called attached behaviors yesterday but I don't know what is that).</p> <p>I'm rewriting a note tacking app that I developed using MVP but now with the MVVM. I will replace the events with commands (using the DelegateCommand), eliminate the views references on the View-Model and I think that's all because the examples that I saw of MVVM is much like MVP.</p> <p>Well, I will appreciate if you point me to all the misunderstandings that I have with this pattern.</p> <p>Thank you and in the future I will help the next MVVM novices :)</p>
 

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