我在MVVM中实现了一个小型的CollectionViewSource演示,用于WPF DataGrid。我真的很感激任何帮助来验证这个实现,并评论是否使用CollectionViewSource的方法是正确的。
public class ViewModel : NotifyProperyChangedBase
{
private ObservableCollection<Movie> _movieList;
public ObservableCollection<Movie> MovieList
{
get { return _movieList; }
set
{
if (this.CheckPropertyChanged<ObservableCollection<Movie>>("MovieList", ref _movieList, ref value))
this.DisplayNameChanged();
}
}
private CollectionView _movieView;
public CollectionView MovieView
{
get { return _movieView; }
set
{
if (this.CheckPropertyChanged<CollectionView>("MovieView", ref _movieView, ref value))
this.DisplayNameChanged();
}
}
public ViewModel()
{
MovieView = GetMovieCollectionView(MovieList);
}
private void DisplayNameChanged()
{
this.FirePropertyChanged("DisplayName");
}
public void UpdateDataGrid(string uri)
{
MovieView = GetMovieCollectionView(new ObservableCollection<Movie>(MovieList.Where(mov => uri.Contains(mov.ID.ToString())).ToList<Movie>()));
}
public CollectionView GetMovieCollectionView(ObservableCollection<Movie> movList)
{
return (CollectionView)CollectionViewSource.GetDefaultView(movList);
}
XAML 视图:
<Window.Resources>
<CollectionViewSource x:Key="MovieCollection" Source="{Binding MovieList}">
</CollectionViewSource>
</Window.Resources>
<DataGrid Name="MyDG"
ItemsSource="{Binding MovieView}"
AutoGenerateColumns="True" />
代码背后:
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
this.Resources.Add("TagVM", new TagViewModel());
this.DataContext = this.Resources["TagVM"];
}
private void Hyperlink_Click(object sender, RoutedEventArgs e)
{
string uri = ((Hyperlink)sender).NavigateUri.ToString();
((ViewModel)this.DataContext).UpdateDataGrid(uri);
}
Hyperlink_Click句柄调用VM的UpdateDataGrid方法,将逗号分隔的电影ID传递给该方法,然后使用扩展方法过滤MovieList集合。