wpf 具有自定义排序的 CollectionViewSource
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CollectionViewSource with custom sort
提问by SimCity
I'm new to WPF and I'm having difficulty trying to sort a CollectionViewSource with a custom sort. Here's the situation:
我是 WPF 的新手，我在尝试使用自定义排序对 CollectionViewSource 进行排序时遇到了困难。这是情况：
I have a SearchView that is called with a parameter which becomes it's datacontext like so:
我有一个 SearchView，它被一个参数调用，它变成了它的数据上下文，如下所示：
mainView.SetGlobalOverlay(New SearchView With {.DataContext = interventionViewModel})
In the SearchView.xaml, I then bind the CollectionViewSource to the collection :
在 SearchView.xaml 中，我然后将 CollectionViewSource 绑定到集合：
<CollectionViewSource x:Key="UnitsCollection"
Filter="UnitsCollection_Filter"
Source="{Binding Path=Units}" />
Now, I already have an IComparer interface implemented in another shared class. This comparer is used on a ListCollectionView somewhere else in the sourcecode and works fine. Now, how can I re-use this comparer on a CollectionViewSource?
现在，我已经在另一个共享类中实现了一个 IComparer 接口。这个比较器用于源代码中其他地方的 ListCollectionView 并且工作正常。现在，我如何在 CollectionViewSource 上重用这个比较器？
回答by
In order to use the custom sorter for the CollectionViewSource, you have to wait until the ItemsControl(e.g. a list box) is loaded; then you can get the ListCollectionViewusing the Viewproperty of the CollectionViewSource.
为了对 使用自定义排序器CollectionViewSource，您必须等到ItemsControl（例如列表框）加载；然后你可以得到ListCollectionViewusing 的View属性CollectionViewSource。
As illustration, here is a small example that displays a list of integers in two different ways: the upper list box applies a custom sort order, whereas the lower list box is unsorted:
作为说明，这里有一个小示例，它以两种不同的方式显示整数列表：上方的列表框应用自定义排序顺序，而下方的列表框未排序：
MainWindow.xaml:
主窗口.xaml：
<Window x:Class="WpfApplication27.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:clr="clr-namespace:System;assembly=mscorlib"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="300">
<Window.Resources>
<CollectionViewSource x:Key="MyCollectionViewSource1" Source="{Binding RawData}" />
<CollectionViewSource x:Key="MyCollectionViewSource2" Source="{Binding RawData}" />
</Window.Resources>
<Grid>
<Grid.RowDefinitions>
<RowDefinition/>
<RowDefinition/>
</Grid.RowDefinitions>
<ListBox Grid.Row="0" Margin="5" Background="LightSkyBlue"
ItemsSource="{Binding Source={StaticResource MyCollectionViewSource1}}"/>
<ListBox Grid.Row="1" Margin="5" Background="LightYellow"
ItemsSource="{Binding Source={StaticResource MyCollectionViewSource2}}"/>
</Grid>
</Window>
MainWindow.xaml.cs:
主窗口.xaml.cs：
using System.Collections;
using System.Collections.ObjectModel;
using System.Windows;
using System.Windows.Data;
namespace WpfApplication27
{
public partial class MainWindow : Window
{
public ObservableCollection<int> RawData { get; private set; }
public MainWindow()
{
RawData = new ObservableCollection<int> { 10, 222, 1, 333, 2, 777, 6 };
InitializeComponent();
DataContext = this;
this.Loaded += MainWindow_Loaded;
}
void MainWindow_Loaded(object sender, RoutedEventArgs e)
{
CollectionViewSource source = (CollectionViewSource)(this.Resources["MyCollectionViewSource1"]);
ListCollectionView view = (ListCollectionView)source.View;
view.CustomSort = new CustomSorter();
}
}
// Sort by number of digits (descending), then by value (ascending)
public class CustomSorter : IComparer
{
public int Compare(object x, object y)
{
int digitsX = x.ToString().Length;
int digitsY = y.ToString().Length;
if (digitsX < digitsY)
{
return 1;
}
else if (digitsX > digitsY)
{
return -1;
}
return (int) x - (int) y;
}
}
}
