集合中项的Observable Collection属性已更改

蛮力:

1. 将处理程序附加到每个子项的每个PropertyChanged事件
2. 从CollectionViewSource中获取ListCollectionView
3. 调用刷新。

编辑:

1,2的代码将存在于您的代码中。

对于1,您可以执行如下操作:

private void Source_CollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
{
    switch (e.Action)
    {
        case NotifyCollectionChangedAction.Add:
            foreach( SomeItem item in e.NewItems)
            {
               item.PropertyChanged += new PropertyChangedEventHandler(_SomeItem_PropertyChanged); 
            }
            break;
....
**HANDLE OTHER CASES HERE**
....
      }
}

对于2,在CollectionChanged处理程序中,您可以执行如下操作:

private void _SomeItem_PropertyChanged(object sender, PropertyChangedEventArgs e)
{
    ListCollectionView lcv = (ListCollectionView)(CollectionViewSource.GetDefaultView(theListBox.ItemsSource));
    lcv.Refresh();
}

编辑2: 但是,在这种情况下,我会 强烈地 建议您也检查listcollectionview.needsrefresh,如果设置了,则只刷新。如果您的属性发生了不影响排序的更改,则没有理由重新排序。

这是可行的。每当集合更改时,它会对集合重新排序。也许可以以更有效的方式实现,但这就是其中的要点。

public partial class TestWindow : Window {
        ObservableCollection<TestClass> oc;
        public TestWindow() {
            InitializeComponent();
            // Fill in the OC for testing 
            oc = new ObservableCollection<TestClass>();
            foreach( char c in "abcdefghieeddjko" ) {
                oc.Add( new TestClass( c.ToString(), c.ToString(), c.GetHashCode() ) );
            }

            lstbox.ItemsSource = oc;
            // Set up the sorting (this is how you did it.. doesn't work)
            lstbox.Items.SortDescriptions.Add( new SortDescription("A", ListSortDirection.Ascending) );
            // This is how we're going to do it
            oc.CollectionChanged += new System.Collections.Specialized.NotifyCollectionChangedEventHandler( oc_Sort );
        }

        void oc_Sort( object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs e ) {
            // This sorts the oc and returns IEnumerable
            var items = oc.OrderBy<TestClass, int>( ( x ) => ( x.C ) );
            // Rest converst IEnumerable back to OC and assigns it
            ObservableCollection<TestClass> temp = new ObservableCollection<TestClass>();
            foreach( var item in items ) {
                temp.Add( item );
            }
            oc = temp;
        }

        private void Button_Click( object sender, RoutedEventArgs e ) {
            string a = "grrrr";
            string b = "ddddd";
            int c = 383857;
            oc.Add( new TestClass( a, b, c ) );
        }


    }

    public class TestClass : INotifyPropertyChanged {
        private string a;
        private string b;
        private int c;

        public TestClass( string f, string g, int i ) {
            a = f;
            b = g;
            c = i;
        }
        public string A {
            get { return a; }
            set { a = value; OnPropertyChanged( "A" ); }
        }
        public string B {
            get { return b; }
            set { b = value; OnPropertyChanged( "B" ); }
        }
        public int C {
            get { return c; }
            set { c = value; OnPropertyChanged( "C" ); }
        }

        #region onpropertychanged

        public event PropertyChangedEventHandler PropertyChanged;
        protected void OnPropertyChanged( string propertyName ) {
            if( this.PropertyChanged != null ) {
                PropertyChanged( this, new PropertyChangedEventArgs( propertyName ) );
            }
        }
        #endregion
    }

XAML:

<Window x:Class="ServiceManager.TestWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="TestWindow" Height="500" Width="500">
    <DockPanel>
        <ListBox ItemsSource="{Binding}" x:Name="lstbox">
            <ListBox.ItemTemplate>
                <DataTemplate>
                    <StackPanel Orientation="Horizontal">
                        <Label Content="{Binding Path=A}"/>
                        <Label Content="{Binding Path=B}"/>
                        <Label Content="{Binding Path=C}"/>
                    </StackPanel>
                </DataTemplate>
            </ListBox.ItemTemplate>
        </ListBox>
        <Button Click="Button_Click" Content="Click" />
    </DockPanel>
</Window>