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POEntity Framework CTP5 Code First, WPF - MVVM modeling
 

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  1. POEntity Framework CTP5 Code First, WPF - MVVM modeling
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    <p>I have my model all setup for my WPF application and working with entity framework ctp5 code first, here's a sample model class:</p> <pre><code>public class Task { public int ID { get; set; } public int Index { get; set; } public string Content { get; set; } public int Indentation { get; set; } public DateTime Start { get; set; } public decimal Effort { get; set; } public decimal CompletedEffort { get; set; } public decimal Cost { get; set; } } </code></pre> <p>What would be the recommended way to build my view model? My view models will implement INotifyPropertyChanged, I do not want the model classes to have any UI specific code - so that they can be easily reused in other apps. Should I make all of the model properties virtual then override them in the view model? (seems like a lot of unnecessary coding...) Would EF code first play nice with this type of format?</p> <p><strong>Edit</strong> This is a somewhat similar question <a href="https://stackoverflow.com/questions/772214/in-mvvm-should-the-viewmodel-or-model-implement-inotifypropertychanged">In MVVM should the ViewModel or Model implement INotifyPropertyChanged?</a> however, the only solutions appear to be adding in what I consider to be UI logic into the model. Perhaps I can add some sort of delegate to the model and hook into that from the viewmodel, which will in turn use INotifyPropertyChanged... something like this?</p> <pre><code> public class Task { public delegate void HandleChange(string propertyName); public HandleChange ChangeHandler; public int ID { get { return ID; } set { if(ID != value) { ID = value; ChangeHandler("ID"); } } } ... </code></pre>
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    1. COChris, your Edit:This IS basically an implementation of `INotifyPropertyChanged`! Your delegate `HandleChange` has the same purpose as the delegate `PropertyChangedEventHandler` and the variable `ChangeHandler` has the same purpose as `PropertyChanged`. The only difference is that you don't mark ChangeHandler as `event` (which is only a protection mechanism to allow only for subscribing and unsubscribing but forbids for instance to set the handler to null). BTW: `INotifyPropertyChanged` is in Assembly `System.dll`, namespace `System.ComponentModel`; it has nothing to do with WPF or UI at all.
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