C# WPF DataGrid的CollectionViewSource MVVM实现
我已经在MVVM中为WPF DataGrid实现了CollectionViewSource的小演示。如果您能帮助我验证实现并评论这是否是使用CollectionViewSource的正确方法,我将不胜感激C# WPF DataGrid的CollectionViewSource MVVM实现,c#,wpf,mvvm,datagrid,collectionviewsource,C#,Wpf,Mvvm,Datagrid,Collectionviewsource,我已经在MVVM中为WPF DataGrid实现了CollectionViewSource的小演示。如果您能帮助我验证实现并评论这是否是使用CollectionViewSource的正确方法,我将不胜感激 public class ViewModel : NotifyProperyChangedBase { private ObservableCollection<Movie> _movieList; public ObservableCollectio
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);
}
Hyperlink_Click处理程序调用VM的UpdateDataGrid方法,将逗号分隔的电影ID传递给它,然后使用扩展方法过滤电影列表集合。您可以通过直接执行此操作跳过添加资源:
DataContext=new TagViewModel()代码>并正常执行绑定。但是我强烈建议使用依赖注入。您不应该创建可观察集合和集合视图的新实例。为collecion视图上的filter属性指定一个谓词,并在需要筛选集合时调用Refresh
public class ViewModel : NotifyProperyChangedBase
{
string uri;
public ObservableCollection<Movie> MovieList { get; private set; }
public CollectionView MovieView { get; private set; }
public ViewModel(MoveList movieList)
{
MovieList = movieList;
MovieView = GetMovieCollectionView(MovieList);
MovieView.Filter = OnFilterMovie;
}
public void UpdateDataGrid(string uri)
{
this.uri = uri;
MovieView.Refresh();
}
bool OnFilterMovie(object item)
{
var movie = (Movie)item;
return uri.Contains(movie.ID.ToString());
}
public CollectionView GetMovieCollectionView(ObservableCollection<Movie> movList)
{
return (CollectionView)CollectionViewSource.GetDefaultView(movList);
}
}
公共类视图模型:notifyPropertyChangedBase
{
字符串uri;
公共可观测集合电影列表{get;private set;}
公共集合视图电影视图{get;private set;}
公共视图模型(MoveList movieList)
{
MovieList=MovieList;
MovieView=GetMovieCollectionView(MovieList);
MovieView.Filter=OnFilterMovie;
}
public void UpdateDataGrid(字符串uri)
{
this.uri=uri;
MovieView.Refresh();
}
bool onfilter电影(对象项)
{
var movie=(movie)项;
返回uri.Contains(movie.ID.ToString());
}
公共集合视图GetMovieCollectionView(可观察集合movList)
{
return(CollectionView)CollectionViewSource.GetDefaultView(movList);
}
}
以下是一个实例化CollectionViewSource以在DataGrid中启用多重筛选的示例:
CollectionViewSource已在XAML视图中实例化,但已绑定到视图模型中实例化的对象集合。然后,视图模型使用CollectionViewSource过滤DataGrid中的数据
至于实例化CollectionViewSource的正确方法是什么,这是有争议的。您的代码有点误导,请验证类名。ViewModel,标记ViewModel。。所以我们可以更好地理解。哦,对不起@HichemC,实际上在发布问题时重命名了类名。忘记在代码后面更改它了。不过观察得不错。谢谢你引起我的注意。
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);
}
public class ViewModel : NotifyProperyChangedBase
{
string uri;
public ObservableCollection<Movie> MovieList { get; private set; }
public CollectionView MovieView { get; private set; }
public ViewModel(MoveList movieList)
{
MovieList = movieList;
MovieView = GetMovieCollectionView(MovieList);
MovieView.Filter = OnFilterMovie;
}
public void UpdateDataGrid(string uri)
{
this.uri = uri;
MovieView.Refresh();
}
bool OnFilterMovie(object item)
{
var movie = (Movie)item;
return uri.Contains(movie.ID.ToString());
}
public CollectionView GetMovieCollectionView(ObservableCollection<Movie> movList)
{
return (CollectionView)CollectionViewSource.GetDefaultView(movList);
}
}