带有SharedSizeGroup列的网格的行为非常奇怪(*NOT*无限循环)

如果运行上方ItemsControl下方的示例窗口，则会更新布局几秒钟，直到最终所有列都具有正确的宽度（correct=与下方ItemsControl内的列相同）。

您可以更改窗口的宽度，并水平和垂直滚动ScrollViewer周围较低的ItemsControls，但一旦更改窗口的高度，布局就会翻转几秒钟。

注意：在网格无限更新大小的其他问题中，没有大小模糊性。

是我做错了什么吗？如果是，我该怎么解决还是应该将此问题发布到Microsoft Connect？

代码背后：

namespace DynamicGridColumnBinding
{
    using System;
    using System.Collections.Generic;
    using System.Globalization;
    using System.Linq;
    using System.Windows;
    using System.Windows.Controls;
    public partial class MainWindow
    {
        private static readonly CultureInfo[] cultureInfos =
            CultureInfo.GetCultures(CultureTypes.NeutralCultures).Take(15).ToArray();
        public MainWindow()
        {
            this.InitializeComponent();
        }
        public static IEnumerable<CultureInfo> AllCultures
        {
            get { return cultureInfos; }
        }
        private void GridInitialized(object sender, EventArgs e)
        {
            var grid = (Grid)sender;
            for ( int i = 0; i < cultureInfos.Length; i++ )
                grid.ColumnDefinitions.Add(new ColumnDefinition
                    {
                        Width = GridLength.Auto,
                        SharedSizeGroup = "g" + i,
                    });
        }
        private void ScrollViewerScrollChanged(object sender, ScrollChangedEventArgs e)
        {
            if ( e.HorizontalChange != 0 )
                this.legendScroller.ScrollToHorizontalOffset(e.HorizontalOffset);
        }
    }
}

Xaml：

<FrameworkElement.Resources>
    <ItemsPanelTemplate x:Key="panelTemplate">
        <Grid Initialized="GridInitialized" />
    </ItemsPanelTemplate>
    <Style TargetType="ContentPresenter" x:Key="containerStyle">
        <Setter Property="Tag" Value="{Binding RelativeSource={RelativeSource Self}, Path=(ItemsControl.AlternationIndex)}" />
        <Setter Property="Grid.Column" Value="{Binding RelativeSource={RelativeSource Self}, Path=(ItemsControl.AlternationIndex)}" />
    </Style>
    <Style TargetType="TextBlock" x:Key="textStyle">
        <Setter Property="Padding" Value="5" />
        <Setter Property="Background" Value="Lime" />
        <Setter Property="HorizontalAlignment" Value="Center" />
        <Setter Property="VerticalAlignment" Value="Center" />
    </Style>
</FrameworkElement.Resources>
<DockPanel Grid.IsSharedSizeScope="True" DataContext="{Binding Source={x:Static local:MainWindow.AllCultures}}">
    <ScrollViewer DockPanel.Dock="Top" HorizontalScrollBarVisibility="Hidden" VerticalScrollBarVisibility="Disabled"
            x:Name="legendScroller">
        <ItemsControl ItemsSource="{Binding}" AlternationCount="{x:Static System:Int32.MaxValue}" Margin="0 0 500 0"
                ItemsPanel="{StaticResource panelTemplate}" ItemContainerStyle="{StaticResource containerStyle}">
            <ItemsControl.ItemTemplate>
                <DataTemplate DataType="{x:Type glob:CultureInfo}">
                    <GroupBox Header="{Binding Name}" HeaderStringFormat="[ {0} ]">
                        <TextBlock Style="{StaticResource textStyle}"
                                Text="{Binding Tag, RelativeSource={RelativeSource AncestorType=ContentPresenter, AncestorLevel=2}}" />
                    </GroupBox>
                </DataTemplate>
            </ItemsControl.ItemTemplate>
        </ItemsControl>
    </ScrollViewer>
    <TextBlock Foreground="Red" DockPanel.Dock="Top" Margin="0 10" FontSize="20" Text="some random arbitrary content in between" />
    <ScrollViewer HorizontalScrollBarVisibility="Visible" VerticalScrollBarVisibility="Auto" ScrollChanged="ScrollViewerScrollChanged">
        <ItemsControl ItemsSource="{Binding}" AlternationCount="{x:Static System:Int32.MaxValue}"
                ItemsPanel="{StaticResource panelTemplate}" ItemContainerStyle="{StaticResource containerStyle}">
            <ItemsControl.ItemTemplate>
                <DataTemplate DataType="{x:Type glob:CultureInfo}">
                    <Border Background="DodgerBlue" Padding="5" Margin="1">
                        <GroupBox Header="{Binding DisplayName}">
                            <TextBlock Style="{StaticResource textStyle}" Padding="5 100"
                                    Text="{Binding Tag, RelativeSource={RelativeSource AncestorType=ContentPresenter, AncestorLevel=2}}" />
                        </GroupBox>
                    </Border>
                </DataTemplate>
            </ItemsControl.ItemTemplate>
        </ItemsControl>
    </ScrollViewer>
</DockPanel>

BTW：如果你强制上层ItemsControl的项目进行大小给定（通过将MinWidth="200"添加到GroupBox），那么下层ItemsControl就会表现得很傻。

BTW2：从大约8个共享大小的列开始（在示例中有15个，由.Take(15)控制），您可以看到重新排列的出现，并且添加的每一列的时间都会翻倍——因此20个列在几分钟内几乎不会结束。

BTW3:在3个月内没有收到任何评论是非常令人沮丧的