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POWPF MVVM Single ViewModel for Display and Editing
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  1. POWPF MVVM Single ViewModel for Display and Editing
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    copied!<p>I am using the example from <a href="http://msdn.microsoft.com/en-us/magazine/dd419663.aspx" rel="nofollow">Josh Smith</a>. He has a WorkspaceViewModel which display a list of CustomerViewModels. He is using the same ViewModel for displaying all Customers and for editing one single customer.</p> <p>Is this a good practice? If I have a list of CustomerViewModels I dont need the SaveCommand or the CloseCommand or some IsSelected Flag.</p> <p>Is it better to have a seperate EditCustomerViewModel? But how to deal with Workspace related stuff? For example:</p> <pre><code>public class Workspace : ViewModel { public ICommand CloseCommand; } public class AllCustomers : Workspace { public ObservableCollection&lt;CustomerViewModel&gt; CustomerViewModels; } // Option A (one ViewModel for display and edit): public class CustomerViewModel : ? { public string CustomerName; public ICommand SaveCommand; } </code></pre> <p>Or seperation:</p> <pre><code>// Option B: public class CustomerViewModel : ViewModel { public string CustomerName; } public class EditCustomerViewModel : Workspace { public CustomerViewModel CustomerViewModel; public ICommand SaveCommand; } // Option C (CustomerViewModel does not need CloseCommand but EditCustomerViewModel does): public class CustomerViewModel : Workspace { public string CustomerName; } public class EditCustomerViewModel : CustomerViewModel { public ICommand SaveCommand; } </code></pre> <p><strong>Edit:</strong> I try to clarify my problem. In the CustomerViewModel in the example of Josh Smith, he has Commands for closing and saving a customer. In the AllCustomerView he has a GridView that binds to a ObservableCollection of CustomerViewModels. But in the GridView the both commands are not necessary. In the GridView I can ignore both commands, but is that a good design? </p>
 

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