将选定的 RowCount 绑定到 TextBlock 在 DataGrid 滚动后不触发 OnPropertyChanged

所有，我最近遇到一个问题，DataGrid当选定的行滚动时没有更新（使用多重选择时 WPF DataGrid 列损坏 https://stackoverflow.com/questions/17459832/wpf-datagrid-column-becoming-corrupt-when-using-multi-selection）这是使用链接答案中的方法解决的。

我有一个TextBlock in a StatusBar我将其绑定到IsSelected属性到所需的 ViewModel。我认为上述问题的解决方案也可以解决所选行计数未正确更新的事实；也就是说，当DataGrid滚动条不移动，但是当滚动条移动时，TextBlock无法更新，因为OnPropertyChanged事件没有被触发。我已经检查了很多关于此的帖子并设置了IsAsync=true这确实有助于使选择正确（在此更新之前为 1）。相关的 XMAL 是

<DataGrid Grid.Row="1" AlternatingRowBackground="Gainsboro" AlternationCount="2" 
          HorizontalAlignment="Stretch" VerticalAlignment="Stretch" 
          AutoGenerateColumns="False" RowHeaderWidth="0" IsReadOnly="True"
          CanUserAddRows="False" CanUserDeleteRows="False" SelectionMode="Extended" 
          EnableRowVirtualization="True" EnableColumnVirtualization="True" 
          ItemsSource="{Binding Cultures, NotifyOnSourceUpdated=True, UpdateSourceTrigger=PropertyChanged, IsAsync=True}" 
          dataAccess:MultiSelectItem.IsEnabled="True">
 <DataGrid.Columns>
    <DataGridTextColumn Header="Code" Binding="{Binding Code}" IsReadOnly="True"/>
    <DataGridTextColumn Header="Language" Binding="{Binding Language}" IsReadOnly="True"/>
    <DataGridTextColumn Header="LocalName" Binding="{Binding LocalName}" IsReadOnly="True"/>
 </DataGrid.Columns>
</DataGrid>

<StatusBar Grid.Row="1" Margin="0,0.4,0.4,-0.4">
    <StatusBarItem DockPanel.Dock="Left" Background="#FF007ACC" Margin="0,2,0,0">
       <TextBlock Text="{Binding TotalSelectedCultures}"  Margin="5,0,0,0" Foreground="White"/>
    </StatusBarItem>
</StatusBar>

链接到的视图模型在哪里

public class CultureDataViewModel : ViewModelBase
{
    public enum FilterType
    {
      AllCultures,
      NeutralCultures,
      SpecificCultures
    };
    public FilterType SelectedFilterType { get; private set; }
    public ICollectionView CulturesView { get; private set; }
    public MultiSelectCollectionView<CultureViewModel> Cultures { get; private set; }

    public CultureDataViewModel()
    {
        SelectedFilterType = FilterType.AllCultures;
        LoadCultures();
    }

    void OnCultureViewModelPropertyChanged(object sender, PropertyChangedEventArgs e)
    {
        string IsSelected = "IsSelected";
        (sender as CultureViewModel).VerifyPropertyName(IsSelected);
        if (e.PropertyName == IsSelected)
            this.OnPropertyChanged("TotalSelectedCultures");
    }

    void OnCollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
    {
        if (e.NewItems != null && e.NewItems.Count != 0)
            foreach (CultureViewModel cultVm in e.NewItems)
                cultVm.PropertyChanged += this.OnCultureViewModelPropertyChanged;

        if (e.OldItems != null && e.OldItems.Count != 0)
            foreach (CultureViewModel cultVm in e.OldItems)
                cultVm.PropertyChanged -= this.OnCultureViewModelPropertyChanged;
    }

    /// <summary>
    /// Load the avalible cultures depending on filter selection
    /// </summary>
    public void LoadCultures()
    {
        // Get data...
    }

    /// <summary>
    /// Hold the current total selected cultures to add to the resource 
    /// data set.
    /// </summary>
    public string TotalSelectedCultures
    {
        get
        {
            int selectedCultures = this.Cultures.SelectedItems.Count;
            return String.Format("{0:n0} of {1:n0} cultures selected",
                                        selectedCultures,
                                        Cultures.Count);
        }
    }
}

TotalSelectedCultures停止更新时DataGrid滚动，如何停止这种情况并允许显示行数，即使在这种情况下也是如此？

谢谢你的时间。

您可以简单地附加到 LoadCultures() 内的 SelectedItems.CollectionChanged 事件吗？

Cultures.SelectedItems.CollectionChanged += SelectedItems_CollectionChanged;

void SelectedItems_CollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
{
    this.RaisePropertyChanged("TotalSelectedCultures");
}