我有一个简单的ListView
并希望按数字或字母顺序,升序或降序对内容进行排序。选择来自下拉框。我知道我可以使用 CollectionViewSource
实现排序,但我怎样才能动态改变 SortDescription 或方向?
更新:
好的,所以我已经像这样设置了我的 CVS,viewModel 是 ListView 当前绑定(bind)的。我要求将 PropertyName 绑定(bind)到当前选定的组合框项的属性 PropertyName
.组合框绑定(bind)到一个自定义列表,该列表公开我想要排序的属性名。
它提示我试图使用的 PropertyName:
A 'Binding' cannot be set on the 'PropertyName' property of type 'SortDescription'. A 'Binding' can only be set on a DependencyProperty of a DependencyObject.
<CollectionViewSource Source="{StaticResource viewModel.ListValues}" x:Key="cvs">
<CollectionViewSource.SortDescriptions>
<scm:SortDescription PropertyName="{Binding Path=SortPropertyName, Source=comboSort}"/>
</CollectionViewSource.SortDescriptions>
</CollectionViewSource>
<ListView ItemsSource="{Binding Source={StaticResource cvs}}" />
最佳答案
你可以在你的 View 模型后面的代码中完成这一切
// in your view model
private void ChangeSorting () {
var collView = CollectionViewSource.GetDefaultView(ListValues);
collView.SortDescriptions.Clear();
// do this one
collView.SortDescriptions.Add(new SortDescription("YourPropertyName", ListSortDirection.Ascending));
// or this one
collView.SortDescriptions.Add(new SortDescription("YourOtherPropertyName", ListSortDirection.Descending));
collView.Refresh();
}
public ICollectionView ListValuesCollectionViewSource
{
get {
return collView;
}
}
<ListView ItemsSource="{Binding viewModel.ListValuesCollectionViewSource}" />
编辑
这是您的 View 模型的一个小示例
<ComboBox ItemsSource="{Binding viewmodel.YourDataForComboboxCollection, Mode=OneWay}"
SelectedItem="{Binding viewmodel.SelectedCombobox}" />
一个小 View 模型
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Windows;
using System.Windows.Data;
namespace YourNameSpace
{
public class ViewModel : INotifyPropertyChanged
{
public static readonly DependencyProperty SelectedComboboxProperty =
DependencyProperty.Register("SelectedCombobox", typeof(YourDataForCombobox), typeof(ViewModel), new PropertyMetadata(default(YourDataForCombobox), new PropertyChangedCallback(SelectedComboboxCallback)));
private static void SelectedComboboxCallback(DependencyObject dependencyObject, DependencyPropertyChangedEventArgs e) {
var vm = sender as ViewModel;
if (vm != null && e.NewValue != null && e.NewValue != e.OldValue) {
vm.ChangeSorting(e.NewValue);
}
}
public ViewModel() {
this.YourDataForComboboxCollection = new ObservableCollection<YourDataForCombobox>();
}
private void ChangeSorting(YourDataForCombobox newValue) {
this.yourCollectionView.SortDescriptions.Clear();
this.yourCollectionView.SortDescriptions.Add(new SortDescription(newValue.PropertyName, newValue.Sorting));
this.yourCollectionView.Refresh();
}
private IObservableCollection yourDataForComboboxCollection;
public IObservableCollection YourDataForComboboxCollection {
get { return this.yourDataForComboboxCollection; }
set {
this.yourDataForComboboxCollection = value;
this.RaisePropertyChanged("YourDataForComboboxCollection");
}
}
public YourDataForCombobox SelectedCombobox {
get { return (YourDataForCombobox)GetValue(SelectedComboboxProperty); }
set { SetValue(SelectedComboboxProperty, value); }
}
private IObservableCollection yourCollection;
private ICollectionView yourCollectionView;
public ICollectionView YourCollectionView {
get { return this.GetCollectionView(); }
}
private ICollectionView GetCollectionView() {
if (this.yourCollection == null) {
this.yourCollection = new ObservableCollection<YourDataForCollection>();
this.yourCollectionView = CollectionViewSource.GetDefaultView(this.yourCollection);
// initial sorting
this.ChangeSorting(null);
}
return this.yourCollectionView;
}
private void RaisePropertyChanged(string property) {
var eh = this.PropertyChanged;
if (eh != null) {
eh(this, new PropertyChangedEventArgs(property));
}
}
public event PropertyChangedEventHandler PropertyChanged;
}
}
希望这可以帮助
关于.net - 仅在 XAML 中更改 ListView 排序属性/方向,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/8331401/