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POMVVM Experts need your opinion on MVVM and Dataforms
 

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    <p>as far as I understand the ViewModel should abstract the model from the view and add additional logic to handle the presentation stuff.</p> <p>My question is:</p> <p>How would I create a dataform that is suppose to handle user input for an order and details at once. It should present fields for entering the orders as well as the fields for 1 detail.</p> <p>My Model would have an object for an order which contains a list of OrderDetails.</p> <p>How would look my ViewModel for my OrderEntryForm like?</p> <p>Would I have an OrderViewModel and an OrderDetailViewModel and my my OrderEntryForm would contain a property of OrderViewModel and one for OrderDetailViewModel? (nesting ViewModels?) How would validation be handled in this case? Since Validation should go close to the model? Especially when I work with RIA-Service... Wouldn't it make more sense to put it in the ViewModel?</p> <p>How far would you abstract the Model from the ViewModel? Example:</p> <pre><code> private DateTime _OrderDate; public DateTime OrderDate { get { return _OrderDate; } set { if (_OrderDate != value) { _OrderDate = value; OnPropertyChanged("OrderDate"); } } } </code></pre> <p>this would mean I have to map the ViewModel-Property to Model-Properties. Cannot leverage Validation-Logic from the Model here...</p> <p>This example:</p> <pre><code> public DateTime OrderDate { get { return Model.OrderDate; } set { if (Model.OrderDate != value) { Model.OrderDate = value; OnPropertyChanged("OrderDate"); } } } </code></pre> <p>would requiere to pass in a Model. Have the access to the validation logic of the model but also a coupling... </p> <p>Most examples on the web show dataforms which use ViewModel's that a just a representation of the tables not a real abstraction... </p> <p>I know and I saw this </p> <p><a href="https://stackoverflow.com/questions/744474/combining-net-ria-services-and-mvvm-in-silverlight-3-0">stackoverflow.com/questions/744474/combining-net-ria-services-and-mvvm-in-silverlight-3-0 </a></p> <p>I also read nikhils blogpost on this but this handles also only Products straight mapping from the tables of the database... =(</p> <p>I know alot of questions...</p> <p>What are your opinions on that topic? How would you handle complex dataforms?</p>
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