将Wpf HierarchicalDataTemplate ItemsSource绑定到字典中的CollectionViewSource？

I'm trying to display a Wpf Treeview with items sorted by a CollectionViewSource.

我正在尝试使用CollectionViewSource显示的项目显示Wpf Treeview。

Currently, everything is working except sorting using this code in my resource dictionary:

目前，除了在我的资源字典中使用此代码进行排序外，一切正常：

<HierarchicalDataTemplate DataType="{x:Type books:Container}" ItemsSource="{Binding Path=Items}">
    <nav:ContainerControl />
</HierarchicalDataTemplate>

What would be the syntax for changing the HierarchicalDataTemplate to bind to a CollectionViewSource that in turn pulls from the Items property?

更改HierarchicalDataTemplate以绑定到CollectionViewSource的语法是什么，而CollectionViewSource又从Items属性中提取？

I've tried variations of the code posted on Bea Stollnitz's blog with no success. I can't figure out how to set the source of the CollectionViewSource.

我尝试过在Bea Stollnitz博客上发布的代码变体没有成功。我无法弄清楚如何设置CollectionViewSource的源代码。

2 个解决方案

#1

Well let me just say that I hate my proposed solution, but it does work. Perhaps a WPF guru will enlighten us both with a better alternative. Of course if you were using a ViewModel behind your view, you could simply wrap the Items property of the model with a CollectionView in the ViewModel and be done with it.

那么我想说我讨厌我提出的解决方案，但确实有效。也许WPF大师会用更好的选择来启发我们。当然，如果您在视图后面使用ViewModel，则只需在ViewModel中使用CollectionView包装模型的Items属性并完成它。

But here's another solution. Basically, your HierarchicalDataTemplate can stay as is except you would add a Converter to the Binding. I implemented the following converter and changed the XAML accordingly.

但这是另一种解决方案。基本上，除了将转换器添加到绑定之外，您的HierarchicalDataTemplate可以保持原样。我实现了以下转换器并相应地更改了XAML。

<HierarchicalDataTemplate DataType="{x:Type books:Container}"
    ItemsSource="{Binding Items, Converter={x:Static local:CollectionViewConverter.Instance}}">
    <nav:ContainerControl />
</HierarchicalDataTemplate>

CollectionViewConverter.cs

public class CollectionViewConverter : IValueConverter
{

    public CollectionViewConverter() {}

    static CollectionViewConverter(){
        Instance = new CollectionViewConverter();
    }

    public static CollectionViewConverter Instance {
        get;
        set;
    }

    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        var view = new ListCollectionView((System.Collections.IList)value);
        view.SortDescriptions.Add(new SortDescription("Name", ListSortDirection.Ascending));
        return view;
    }

    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
    {
        // not really necessary could just throw notsupportedexception
        var view = (CollectionView)value;
        return view.SourceCollection;
    }
}

#2

I did as you suggested and wrapped the Items collection with a ListCollectionView:

我按照你的建议做了，用ListCollectionView包装Items集合：

private SortDescription _ItemsLcvSortDesc;
    private SortDescription ItemsLcvSortDesc
    {
        get
        {
            if (_ItemsLcvSortDesc == null)
                _ItemsLcvSortDesc = new SortDescription("SortOrder", ListSortDirection.Ascending);
            return _ItemsLcvSortDesc;
        }
    }

    private ListCollectionView _ItemsLcv;
    public ListCollectionView ItemsLcv
    {
        get
        {
            if (_ItemsLcv == null)
                _ItemsLcv = CollectionViewSource.GetDefaultView(Items) as ListCollectionView;
            _ItemsLcv.SortDescriptions.Add(ItemsLcvSortDesc);
            return _ItemsLcv;
        }
    }

Did I miss anything?

我错过了什么吗？

#1