を助けwmodel
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;
}
}
は希望また、動的にソート記述方向を設定するためにバインドするために別のプロパティを追加し、行動にこれを置くことができますが、このソリューションは、唯一のプロパティでソートするために動作します。それは確かにより多くのために働くために拡大することができます。
XAML:
<CollectionViewSource x:Key="GroupedMeetingItems" Source="{Binding Items}" util:CollectionViewSourceBehavior.IsAscending="{Binding IsItemsAscending}">
<CollectionViewSource.GroupDescriptions>
<PropertyGroupDescription PropertyName="StartDateTime" Converter="{StaticResource DateTimeToDisplayDateConverter}" />
</CollectionViewSource.GroupDescriptions>
<CollectionViewSource.SortDescriptions>
<scm:SortDescription PropertyName="StartDateTime" Direction="Descending"/>
</CollectionViewSource.SortDescriptions>
</CollectionViewSource>
行動:
public static class CollectionViewSourceBehavior
{
public static readonly DependencyProperty IsAscendingProperty =
DependencyProperty.RegisterAttached(
"IsAscending",
typeof(bool),
typeof(CollectionViewSourceBehavior),
new UIPropertyMetadata(false, OnIsAscendingChanged));
public static object GetIsAscending(FrameworkElement element)
{
return element.GetValue(IsAscendingProperty);
}
public static void SetIsAscending(FrameworkElement element, object value)
{
element.SetValue(IsAscendingProperty, value);
}
public static void OnIsAscendingChanged(DependencyObject dependencyObject, DependencyPropertyChangedEventArgs e)
{
var collectionViewSource = dependencyObject as CollectionViewSource;
if (collectionViewSource == null)
{
return;
}
var isAscending = e.NewValue as bool? == true;
var newSortDescription = new SortDescription
{
Direction = isAscending ? ListSortDirection.Ascending : ListSortDirection.Descending,
PropertyName = collectionViewSource.SortDescriptions.FirstOrDefault().PropertyName
};
collectionViewSource.SortDescriptions.Clear();
collectionViewSource.SortDescriptions.Add(newSortDescription);
}
}
あなたが(別の比較演算子を持つ)新しいソート説明を追加し、最終的に私が欲しいCollectionViewSource – punker76
にリフレッシュを呼び出し、古いソートの記述を削除することができますこれはXAMLのみで、つまりコードビハインドなし(ViewModelのコードは受け入れ可能) – Chris
はい、次にドロップダウンボックスがビューモデルのプロパティにバインドされ、選択を変更した後でCollectionViewSource(listvie wはCollectionViewSourceにバインドします) – punker76