按搜索字符串过滤 CollectionViewSource - 绑定到 itemscontrol (WPF MVVM)

问题描述

有没有办法过滤 CollectionViewSource 以只显示 ItemsSource 中的游戏，其中Title"包含searchString"?

Is there a way I can filter the CollectionViewSource to only show games in the ItemsSource which "Title" contains the "searchString"?

在我的 PosterView 中，我有这个 CVS:

In my PosterView I have this CVS:

<CollectionViewSource x:Key="GameListCVS"
                      Source="{Binding PosterView}"
                      Filter="GameSearchFilter">
    <CollectionViewSource.SortDescriptions>
        <scm:SortDescription PropertyName="Title" />
    </CollectionViewSource.SortDescriptions>
</CollectionViewSource>

还有这个ItemsControl

<ItemsControl x:Name="gameListView"
              ItemsSource="{Binding Source={StaticResource GameListCVS}}">

我的 MainWindow.xaml 包含可以成功将 searchString(包含搜索框中内容的字符串)传递给 PosterView 的搜索框.

My MainWindow.xaml contains the search box which can successfully pass the searchString (string containing what is in the search box) to PosterView.

PosterView 绑定实际上是(令人困惑，我知道)，一个 ObservableCollection

PosterView binding is actually (confusingly, I know), an ObservableCollection

public ObservableCollection<GameList> PosterView { get; set; }

这是如何将游戏添加到 ObservableCollection

And here is how games are added to the ObservableCollection

games.Add(new GameList
{
    Title = columns[0],
    Genre = columns[1],
    Path = columns[2],
    Link = columns[3],
    Icon = columns[4],
    Poster = columns[5],
    Banner = columns[6],
    Guid = columns[7]
});

推荐答案

如果你在视图中创建 CollectionViewSource，你也应该在那里过滤它:

If you are creating the CollectionViewSource in the view, you should filter it there as well:

private void GameSearchFilter(object sender, FilterEventArgs e)
{
    GameList game = e.Item as GameList;
    e.Accepted = game != null && game.Title?.Contains(txtSearchString.Text);
}

另一种选择是绑定到 ICollectionView 并在视图模型中过滤这个:

The other option would be to bind to an ICollectionView and filter this one in the view model:

_view = CollectionViewSource.GetDefaultView(sourceCollection);
_view.Filter = (obj) => 
{
    GameList game = obj as GameList;
    return game != null && game.Title?.Contains(_searchString);
};
...
public string SearchString
{
    ...
    set { _searchString = value; _view.Refresh(); }
}

或者直接对源集合本身进行排序.

Or sort the source collection itself directly.

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