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POHow to save data from a DetailView bound to a ViewModel if the repository is a no-go in a viewmodel?
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  1. POHow to save data from a DetailView bound to a ViewModel if the repository is a no-go in a viewmodel?
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    copied!<p>we mvvm lovers all know Josh Smith mvvm sample and how he has saved the customer in the detail customer view by injecting the repository object into the customerViewModel`s constructor.</p> <p>But a viewmodel should not know about repositories. Its just a model of a view nothing must being aware of persistence etc...</p> <p>How can I register my Action delegate SaveDocumentDelegate on the DocumentViewModel if its set in the code-behind? Actually I should subscribe the delegate in my DocumentController but how can I instantiate the DocumentView in my DocumentController and set it as Datacontext not doing that in code-behind. Only thing that came to my mind is using a contentcontrol in the window and bind it to the type of the viewModel and datatemplate it with the Document UserControl like this:</p> <pre><code>&lt;UserControl.Resources&gt; &lt;DataTemplate DataType="{x:Type ViewModel:DocumentViewModel}"&gt; &lt;View:DocumentDetailView/&gt; &lt;/DataTemplate&gt; &lt;/UserControl.Resources&gt; &lt;ContentControl Content="{Binding MyDocumentViewModel}" /&gt; </code></pre> <p>But I do not want to use a control to solve my architectural problems...</p> <p><strong>xaml</strong>:(view first approach)</p> <pre><code>public partial class DocumentDetailView : UserControl { public DocumentDetailView() { InitializeComponent(); this.DataContext = new DocumentViewModel(new Document()); } } </code></pre> <p><strong>DocumentViewModel:</strong></p> <pre><code> public class DocumentViewModel : ViewModelBase { private Document _document; private RelayCommand _saveDocumentCommand; private Action&lt;Document&gt; SaveDocumentDelegate; public DocumentViewModel(Document document) { _document = document; } public RelayCommand SaveDocumentCommand { get { return _saveDocumentCommand ?? (_saveDocumentCommand = new RelayCommand(() =&gt; SaveDocument())); } } private void SaveDocument() { SaveDocumentDelegate(_document); } public int Id { get { return _document.Id; } set { if (_document.Id == value) return; _document.Id = value; this.RaisePropertyChanged("Id"); } } public string Name { get { return _document.Name; } set { if (_document.Name == value) return; _document.Name = value; this.RaisePropertyChanged("Name"); } } public string Tags { get { return _document.Tags; } set { if (_document.Tags == value) return; _document.Tags = value; this.RaisePropertyChanged("Tags"); } } } </code></pre> <p><strong>UPDATE</strong>:</p> <pre><code>public class DocumentController { public DocumentController() { var win2 = new Window2(); var doc = new DocumentViewModel(new DocumentPage()); doc.AddDocumentDelegate += new Action&lt;Document&gt;(OnAddDocument); win2.DataContext = doc; wind2.ShowDialog(); } private void OnAddDocument(Document doc) { _repository.AddDocument(doc); } } </code></pre> <p>What do you think about that idea?</p>
 

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