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POWPF Application framework is binding to the model?
 

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  1. POWPF Application framework is binding to the model?
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    <p>today I examinted WAP from codeplex a bit and saw this:</p> <p>BookListView.xaml:</p> <pre><code>&lt;ListView ItemsSource="{Binding Books}" SelectedItem="{Binding SelectedBook}" SelectionChanged="ListViewSelectionChanged"&gt; &lt;ListView.View&gt; &lt;GridView&gt; &lt;GridViewColumn DisplayMemberBinding="{Binding Title}" Header="{x:Static p:Resources.Title}" Width="250"/&gt; &lt;GridViewColumn DisplayMemberBinding="{Binding Author}" Header="{x:Static p:Resources.Author}" Width="150"/&gt; &lt;GridViewColumn DisplayMemberBinding="{Binding PublishDate, StringFormat=d}" Header="{x:Static p:Resources.PublishDate}" Width="100"/&gt; &lt;/GridView&gt; &lt;/ListView.View&gt; </code></pre> <p><strong>UPDATE</strong>:</p> <pre><code>[Export(typeof(IBookListView))] public partial class BookListView : UserControl, IBookListView { public BookListView() { InitializeComponent(); } private BookListViewModel ViewModel { get { return DataContext as BookListViewModel; } } private void ListViewSelectionChanged(object sender, SelectionChangedEventArgs e) { foreach (Book book in e.RemovedItems) { ViewModel.SelectedBooks.Remove(book); } foreach (Book book in e.AddedItems) { ViewModel.SelectedBooks.Add(book); } } } public class BookListViewModel : ViewModel&lt;IBookListView&gt; { private readonly IEnumerable&lt;Book&gt; books; private readonly ObservableCollection&lt;Book&gt; selectedBooks; private Book selectedBook; private ICommand addNewCommand; private ICommand removeCommand; public BookListViewModel(IBookListView view, IEnumerable&lt;Book&gt; books) : base(view) { if (books == null) { throw new ArgumentNullException("books"); } this.books = books; this.selectedBooks = new ObservableCollection&lt;Book&gt;(); } public IEnumerable&lt;Book&gt; Books { get { return books; } } public ObservableCollection&lt;Book&gt; SelectedBooks { get { return selectedBooks; } } public Book SelectedBook { get { return selectedBook; } set { if (selectedBook != value) { selectedBook = value; RaisePropertyChanged("SelectedBook"); } } } public ICommand AddNewCommand { get { return addNewCommand; } set { if (addNewCommand != value) { addNewCommand = value; RaisePropertyChanged("AddNewCommand"); } } } public ICommand RemoveCommand { get { return removeCommand; } set { if (removeCommand != value) { removeCommand = value; RaisePropertyChanged("RemoveCommand"); } } } } </code></pre> <p><strong>BookController</strong>: Here the books are fetched from Entity Framework/database</p> <pre><code>public void Initialize() { bookViewModel.LendToCommand = lendToCommand; bookViewModel.PropertyChanged += BookViewModelPropertyChanged; IBookListView bookListView = container.GetExportedValue&lt;IBookListView&gt;(); bookListViewModel = new BookListViewModel(bookListView, entityService.Books); bookListViewModel.AddNewCommand = addNewCommand; bookListViewModel.RemoveCommand = removeCommand; bookListViewModel.PropertyChanged += BookListViewModelPropertyChanged; shellViewModel.BookListView = bookListViewModel.View; shellViewModel.BookView = bookViewModel.View; bookListViewModel.SelectedBook = bookListViewModel.Books.FirstOrDefault(); } </code></pre> <p>and exactly those books are passed bookListViewModel = new BookListViewModel(bookListView, entityService.Books); to the BookListViewModel which is set as DataContext of the BookListView.xaml binding to books.</p> <p>I was shocked!!! Am I right that they directly bind to the models properties?</p>
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    1. COHow can anyone tell from this XAML the source to which these properties are bound?
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    2. COWhy so shocked? While it's maybe not the absolute best approach architecturally speaking, as I understand it WAF isn't supposed to be the be-all-end-all implementation of a WPF application. I've seen this approach commonly used for small to medium applications and even on some larger ones. It's all about the requirements.
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      1. USAlex Paven
 

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