在TabControl选项卡项之间切换时捕获和设置DataGrid滚动位置

我有 TabControl 这有一个 DataGrid TabItem VirtualizingPanel ScrollUnit Pixel ,所以滚动有点自然。

在选项卡项之间切换时,行选择行为正常。但是,在数据网格的 ScrollViewer 所以它的位置和你离开时完全一样 标签项目 工作不正常。

目前的工作方式是,我在 数据网格 Scrollviewer ScrollChangedEvent 它保存了 VerticalOffset . 更换为新的 然后换回原样 标签项目 DataContextChanged 垂直偏移 保存到 垂直偏移

public class DataGridBehaviors : Behavior<DataGrid>
{
    protected override void OnAttached()
    {
        base.OnAttached();
        this.AssociatedObject.DataContextChanged += DataGrid_DataContextChanged;
        this.AssociatedObject.AddHandler(ScrollViewer.ScrollChangedEvent, new ScrollChangedEventHandler(DataGridScrollViewer_ScrollChanged));
    }

    protected override void OnDetaching()
    {
        Console.WriteLine("OnDetaching");
        this.AssociatedObject.RemoveHandler(ScrollViewer.ScrollChangedEvent, new ScrollChangedEventHandler(DataGridScrollViewer_ScrollChanged));
        this.AssociatedObject.DataContextChanged -= DataGrid_DataContextChanged;
        base.OnDetaching();
    }

    private void DataGrid_DataContextChanged(object sender, DependencyPropertyChangedEventArgs e)
    {
        ModuleGeometry oldModuleGeometry = (ModuleGeometry)e.OldValue;
        ModuleGeometry newModuleGeometry = (ModuleGeometry)e.NewValue;
        ScrollViewer scrollViewer = GetVisualChild<ScrollViewer>(this.AssociatedObject);
        if (scrollViewer != null)
        {
            scrollViewer.ScrollToVerticalOffset(newModuleGeometry.VerticalScrollPosition);
        }
    }

    private void DataGridScrollViewer_ScrollChanged(object sender, ScrollChangedEventArgs e)
    {
        ModuleGeometry modGeom = (ModuleGeometry)this.AssociatedObject.DataContext;
        modGeom.VerticalScrollPosition = e.VerticalOffset;
    }

    private static T GetVisualChild<T>(DependencyObject parent) where T : Visual
    {
        T child = default(T);

        int numVisuals = VisualTreeHelper.GetChildrenCount(parent);
        for (int i = 0; i < numVisuals; i++)
        {
            Visual v = (Visual)VisualTreeHelper.GetChild(parent, i);
            child = v as T;
            if (child == null)
            {
                child = GetVisualChild<T>(v);
            }
            if (child != null)
            {
                break;
            }
        }
        return child;
    }
}

所发生的事情是向下滚动,顶部的DataGridRow部分显示(您只能看到它的一半)。然后,当您在两个选项卡项之间切换时,程序会正确设置垂直偏移,但随后会再次自动重置到部分显示行的顶部(完全显示)。

切换前。将垂直偏移保存为4327.2

当你在VirtualizingPanel中加载了一个扩展的行时,情况变得更为奇怪,跳转更为剧烈。

切换回原始选项卡项后

我希望看到滚动位置与我离开时的位置完全相同,我如何才能做到这一点?