Question

我有一个带有详细信息行的数据网格，例如：

<DataGrid x:Name="Applications" CanUserResizeColumns="False" CanUserResizeRows="False" RowStyle="{StaticResource CollapsedRow}" AutoGenerateColumns="false" CanUserAddRows="false" ItemsSource="{Binding Applications}">

<DataGrid.Columns>
 <DataGridTemplateColumn>
   <DataGridTemplateColumn.CellTemplate>
     <DataTemplate>
       <Button Content='&#709;' FontSize="9" Name="ExpanderButton" Click="OnGroupChange" />
     </DataTemplate>
    </DataGridTemplateColumn.CellTemplate>
   </DataGridTemplateColumn>
  <DataGridTextColumn Width="181" Header="Application name" Binding="{Binding Name, Mode=OneWay}" />
</DataGrid.Columns>
<DataGrid.RowDetailsTemplate>
    <!-- SOME DETAILS HERE -->
</DataGrid.RowDetailsTemplate>
</DataGrid>

现在的想法是，我有一个带有附加列的数据网格，并带有一个按钮，该按钮将扩展明细行，所以我的代码是：

private void OnGroupChange(object sender, RoutedEventArgs e)
{
    CollapseGroupDetails();
    for (var visible = (Visual)sender; visible != null; visible = VisualTreeHelper.GetParent(visible) as Visual)
    {
        if (visible.GetType() != typeof(DataGridRow))
            continue;

        var row = (DataGridRow)visible;
        var appName = (ExtenedApplicationFile)row.Item;
                ((ApplicationsViewModel)DataContext).SelectedApplicationFile = appName;

        row.DetailsVisibility = row.DetailsVisibility == Visibility.Visible ? Visibility.Collapsed : Visibility.Visible;
    }

    Applications.UpdateLayout();
}

private void CollapseGroupDetails()
{
    foreach (object item in Applications.ItemsSource)
    {
        if (!(Applications.ItemContainerGenerator.ContainerFromItem(item) is DataGridRow row) ||  row.DetailsVisibility != Visibility.Visible)
            continue;

        row.DetailsVisibility = Visibility.Collapsed;
        break;
    }
}

所以它的工作原理是：我单击一个按钮，它展开了所选网格行的详细信息行，然后关闭了其他行，但是问题是当我单击一个打开的行上的按钮时，我希望它折叠起来，但是

row.DetailsVisibility = row.DetailsVisibility == Visibility.Visible ? Visibility.Collapsed : Visibility.Visible;

此属性的值已经折叠，并且将属性再次设置为可见，但是当我删除时：

CollapseGroupDetails();

方法有效，但是如果我单击另一行的按钮，则先前选择的详细信息行将保持打开状态。我检查了是否选择了正确的行，但检查了它的索引并且它是正确的。有没有办法结合起来？

Answer 1

您可以在设置属性之前创建Visibility值的临时副本：

private void OnGroupChange(object sender, RoutedEventArgs e)
{
    DataGridRow row = null;
    for (var visible = (Visual)sender; visible != null; visible = VisualTreeHelper.GetParent(visible) as Visual)
    {
        if (visible.GetType() != typeof(DataGridRow))
            continue;

        row = (DataGridRow)visible;
        var appName = (ExtenedApplicationFile)row.Item;
        ((ApplicationsViewModel)DataContext).SelectedApplicationFile = appName;

        break;
    }

    if (row != null)
    {
        Visibility currentVisibility = row.DetailsVisibility;
        CollapseGroupDetails();
        row.DetailsVisibility = currentVisibility == Visibility.Visible ? Visibility.Collapsed : Visibility.Visible;
    }
    else
    {
        CollapseGroupDetails();
    }

    Applications.UpdateLayout();
}

折叠数据网格中的详细信息行

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