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.情况如下:
我有一个使用参数调用的SearchView,它变成了它的datacontext,如下所示:
- mainView.SetGlobalOverlay(New SearchView With {.DataContext = interventionviewmodel})
在SearchView.xaml中,然后我将CollectionViewSource绑定到集合:
- <CollectionViewSource x:Key="UnitsCollection"
- Filter="UnitsCollection_Filter"
- Source="{Binding Path=Units}" />
现在,我已经在另一个共享类中实现了IComparer接口.此比较器用于源代码中其他位置的ListCollectionView,并且工作正常.现在,我如何在CollectionViewSource上重用这个比较器?
为了使用CollectionViewSource的自定义排序器,您必须等到ItemsControl(例如列表框)加载;然后,您可以使用CollectionViewSource的View属性获取ListCollectionView.
如图所示,这是一个小例子,它以两种不同的方式显示整数列表:上面的列表框应用自定义排序顺序,而下面的列表框是未排序的:
MainWindow.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:
- 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;
- }
- }
- }