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POviewmodel inheritance and duplicate model references
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copied!<p>My question is: How to manage an inheritance chain of viewmodels?</p> <p>My situation:</p> <p>I'm having a standard <strong>ViewModelBase</strong> which only implements the INotifyPropertyChanged interface. </p> <p>Furthermore I have a <strong>BusinessObjectViewModel</strong> which has a Guid, a <strong>PersonBaseViewModel</strong> which has the persons core data, a <strong>CustomerViewModel</strong> with customer related stuff and a <strong>EmployeeViewModel</strong> with employee related stuff. </p> <p>All viewmodels certainly encapsulate a modelobject (Customer, Employee, PersonBase).</p> <ul> <li>BusinessObjectViewModel inherits from ViewModelBase</li> <li>PersonBaseViewModel inherits from BusinessObjectViewModel</li> <li>CustomerViewModel inherits from PersonBaseViewModel</li> <li>EmployeeViewModel inherits from PersonBaseViewModel</li> </ul> <p>The model comes via constructor into the viewmodel.</p> <p>If I use a constructor chain (every viewmodel makes a call to the base constructor) every viewmodel has it's model to return the encapsulated values from the model. </p> <p>But I got to have a Model property in every viewmodel. In the case of CustomerViewModel I would have a reference in <strong>CustomerViewModel</strong>, one in PersonBaseViewModel and one in <strong>BusinessObjectViewModel</strong> for one and the same object. That sounds stupid to me.</p> <p>Or I have to cast every property access in the upper viewmodels.</p> <p>p.s. this is just a small cut-out of my model hierarchy.</p> <p>Thanks in advance.</p>

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