如何在Xaml中使用sortdescription对树视图项进行排序
本文关键字:视图 排序 sortdescription Xaml | 更新日期: 2023-09-27 17:50:31
我有一个绑定到TreeView
的Layers
列表,其中每个实例都有一个Effects
列表。我通过一个HierarchicalDataTemplate显示它们,它工作得很好,但我正试图使用SortDescriptions
对它们进行排序。
我不知道如何在xaml中做到这一点,但这样做只排序第一级的项目,而不是子项目:
ICollectionView view = CollectionViewSource.GetDefaultView ( treeView1.ItemsSource );
view.SortDescriptions.Add ( new SortDescription ( "Name", ListSortDirection.Ascending ) );
我试着先按.Color
排序,然后按.Name
排序。
任何想法?
编辑:我添加了这个代码:
<Window.Resources>
<CollectionViewSource x:Key="SortedLayers" Source="{Binding AllLayers}">
<CollectionViewSource.SortDescriptions>
<scm:SortDescription PropertyName="Color" />
<scm:SortDescription PropertyName="Name" />
</CollectionViewSource.SortDescriptions>
</CollectionViewSource>
</Window.Resources>
但是这仍然只对层次结构的第一层起作用。我如何为每一层指定它呢?影响收集?
我建议使用转换器对子项进行排序。像这样:
<TreeView Name="treeCategories" Margin="5" ItemsSource="{Binding Source={StaticResource SortedLayers}}">
<TreeView.ItemTemplate>
<HierarchicalDataTemplate ItemsSource="{Binding Effects, Converter={StaticResource myConverter}, ConverterParameter=EffectName}">
<TextBlock Text="{Binding Path=LayerName}" />
<HierarchicalDataTemplate.ItemTemplate>
<DataTemplate>
<TextBlock Text="{Binding Path=EffectName}" />
</DataTemplate>
</HierarchicalDataTemplate.ItemTemplate>
</HierarchicalDataTemplate>
</TreeView.ItemTemplate>
和转换器:
public class MyConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
System.Collections.IList collection = value as System.Collections.IList;
ListCollectionView view = new ListCollectionView(collection);
SortDescription sort = new SortDescription(parameter.ToString(), ListSortDirection.Ascending);
view.SortDescriptions.Add(sort);
return view;
}
public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
{
return null;
}
}
我发现使用多转换器更好:
using System;
using System.Collections;
using System.ComponentModel;
using System.Globalization;
using System.Windows.Data;
namespace Converters
{
[ValueConversion(typeof(object[]), typeof(ListCollectionView))]
public class IListToListCollectionViewConverter : IMultiValueConverter
{
public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
{
var Length = values.Length;
if (Length >= 1 && Length < 3)
{
var IList = values[0] as IList;
var SortName = string.Empty;
if (Length > 1)
SortName = values[1].ToString();
var SortDirection = ListSortDirection.Ascending;
if (Length > 2)
SortDirection = values[2] is ListSortDirection ? (ListSortDirection)values[2] : (values[2] is string ? (ListSortDirection)Enum.Parse(typeof(ListSortDirection), values[2].ToString()) : SortDirection);
var Result = new ListCollectionView(IList);
Result.SortDescriptions.Add(new SortDescription(SortName, SortDirection));
return Result;
}
return null;
}
public object[] ConvertBack(object value, Type[] targetTypes, object parameter, System.Globalization.CultureInfo culture)
{
throw new NotImplementedException();
}
}
}
这不是基于XAML的解决方案,但我面临着同样的问题,并找到了下面的解决方案,
我假设你有3个类如下:AllLayers, Layers &影响
class AllLayers
{
public AllLayers()
{
layers = new ObservableCollection<Layers>();
var collectionView = CollectionViewSource.GetDefaultView(layers);
collectionView.SortDescriptions.Add(new SortDescription("Name", ListSortDirection.Ascending));
collectionView.SortDescriptions.Add(new SortDescription("Color", ListSortDirection.Ascending));
}
public ObservableCollection<Layers> layers { get; }
}
class Layers
{
public Layers(string name, string color)
{
Name = name;
Color = color;
CollectionViewSource.GetDefaultView(effects).SortDescriptions.Add(new SortDescription("Name", ListSortDirection.Ascending));
}
public string Name { get; set; }
public string Color { get; set; }
public ObservableCollection<Effects> effects { get; }
}
class Effects
{
public string Name { get; set; }
}
之后,您现有的绑定应该可以使用排序。不需要更改XAML或任何东西