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Silverlight DataGrid 控件自定义列标题

转载 作者:行者123 更新时间:2023-12-02 07:06:52 25 4
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我想通过过滤、轻松添加编辑等一些需求来改进默认数据网格控件...我正在尝试自定义列标题,但无法实现。我需要向标题添加一些其他控件并在代码端访问它们。有办法做到这一点吗?

谢谢。

<sdk:DataGrid
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:sdk="http://schemas.microsoft.com/winfx/2006/xaml/presentation/sdk"
xmlns:ei="http://schemas.microsoft.com/expression/2010/interactions"
mc:Ignorable="d"
x:Class="DataGridTest.SLDataGrid"
d:DesignWidth="640" d:DesignHeight="480">
<sdk:DataGrid.Resources>
<Style x:Key="SLDataGridStyle" TargetType="sdk:DataGrid">
<Setter Property="RowBackground" Value="#AAEAEFF4"/>
<Setter Property="AlternatingRowBackground" Value="#00FFFFFF"/>
<Setter Property="Background" Value="#FFFFFFFF"/>
<Setter Property="HeadersVisibility" Value="Column"/>
<Setter Property="HorizontalScrollBarVisibility" Value="Auto"/>
<Setter Property="VerticalScrollBarVisibility" Value="Auto"/>
<Setter Property="SelectionMode" Value="Extended"/>
<Setter Property="CanUserReorderColumns" Value="True"/>
<Setter Property="CanUserResizeColumns" Value="True"/>
<Setter Property="CanUserSortColumns" Value="True"/>
<Setter Property="AutoGenerateColumns" Value="True"/>
<Setter Property="RowDetailsVisibilityMode" Value="VisibleWhenSelected"/>
<Setter Property="BorderBrush">
<Setter.Value>
<LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
<GradientStop Color="#FFA3AEB9" Offset="0"/>
<GradientStop Color="#FF8399A9" Offset="0.375"/>
<GradientStop Color="#FF718597" Offset="0.375"/>
<GradientStop Color="#FF617584" Offset="1"/>
</LinearGradientBrush>
</Setter.Value>
</Setter>
<Setter Property="BorderThickness" Value="1"/>
<Setter Property="DragIndicatorStyle">
<Setter.Value>
<Style TargetType="ContentControl">
<Setter Property="Foreground" Value="#7FFFFFFF"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="ContentControl">
<Grid>
<VisualStateManager.VisualStateGroups>
<VisualStateGroup x:Name="SortStates">
<VisualState x:Name="Unsorted"/>
<VisualState x:Name="SortAscending">
<Storyboard>
<DoubleAnimation Duration="0" To="1.0" Storyboard.TargetProperty="Opacity" Storyboard.TargetName="SortIcon"/>
</Storyboard>
</VisualState>
<VisualState x:Name="SortDescending">
<Storyboard>
<DoubleAnimation Duration="0" To="1.0" Storyboard.TargetProperty="Opacity" Storyboard.TargetName="SortIcon"/>
<DoubleAnimation Duration="0" To="-.9" Storyboard.TargetProperty="(RenderTransform).ScaleY" Storyboard.TargetName="SortIcon"/>
</Storyboard>
</VisualState>
</VisualStateGroup>
</VisualStateManager.VisualStateGroups>
<Rectangle x:Name="BackgroundRectangle" Grid.ColumnSpan="2" Fill="#66808080" Stretch="Fill"/>
<Rectangle x:Name="BackgroundGradient" Grid.ColumnSpan="2" Opacity="0" Stretch="Fill">
<Rectangle.Fill>
<LinearGradientBrush EndPoint=".7,1" StartPoint=".7,0">
<GradientStop Color="#FFFFFFFF" Offset="0.015"/>
<GradientStop Color="#F9FFFFFF" Offset="0.375"/>
<GradientStop Color="#E5FFFFFF" Offset="0.6"/>
<GradientStop Color="#C6FFFFFF" Offset="1"/>
</LinearGradientBrush>
</Rectangle.Fill>
</Rectangle>
<Grid HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" Margin="{TemplateBinding Padding}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}">
<Grid.ColumnDefinitions>
<ColumnDefinition/>
<ColumnDefinition Width="Auto"/>
</Grid.ColumnDefinitions>
<ContentPresenter Content="{TemplateBinding Content}"/>
<Path x:Name="SortIcon" Grid.Column="1" Data="F1 M -5.215,6.099L 5.215,6.099L 0,0L -5.215,6.099 Z " Fill="#7FFFFFFF" HorizontalAlignment="Left" Margin="4,0,0,0" Opacity="0" RenderTransformOrigin=".5,.5" Stretch="Uniform" VerticalAlignment="Center" Width="8">
<Path.RenderTransform>
<ScaleTransform ScaleY=".9" ScaleX=".9"/>
</Path.RenderTransform>
</Path>
</Grid>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</Setter.Value>
</Setter>
<Setter Property="DropLocationIndicatorStyle">
<Setter.Value>
<Style TargetType="ContentControl">
<Setter Property="Background" Value="#FF3F4346"/>
<Setter Property="Width" Value="2"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="ContentControl">
<Rectangle Fill="{TemplateBinding Background}" Height="{TemplateBinding Height}" Width="{TemplateBinding Width}"/>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</Setter.Value>
</Setter>
<Setter Property="GridLinesVisibility" Value="Vertical"/>
<Setter Property="HorizontalGridLinesBrush" Value="#FFC9CACA"/>
<Setter Property="IsTabStop" Value="True"/>
<Setter Property="VerticalGridLinesBrush" Value="#FFC9CACA"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="sdk:DataGrid">
<Grid>
<VisualStateManager.CustomVisualStateManager>
<ei:ExtendedVisualStateManager/>
</VisualStateManager.CustomVisualStateManager>
<VisualStateManager.VisualStateGroups>
<VisualStateGroup x:Name="CommonStates" ei:ExtendedVisualStateManager.UseFluidLayout="True">
<VisualStateGroup.Transitions>
<VisualTransition GeneratedDuration="0:0:0.3"/>
</VisualStateGroup.Transitions>
<VisualState x:Name="Normal"/>
<VisualState x:Name="Disabled">
<Storyboard>
<DoubleAnimation Duration="0" To="1" Storyboard.TargetProperty="Opacity" Storyboard.TargetName="DisabledVisualElement"/>
</Storyboard>
</VisualState>
</VisualStateGroup>
<VisualStateGroup x:Name="ValidationStates" ei:ExtendedVisualStateManager.UseFluidLayout="True">
<VisualStateGroup.Transitions>
<VisualTransition GeneratedDuration="0:0:0.3"/>
</VisualStateGroup.Transitions>
<VisualState x:Name="Invalid"/>
<VisualState x:Name="Valid"/>
</VisualStateGroup>
</VisualStateManager.VisualStateGroups>
<Border BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" CornerRadius="2">
<Grid x:Name="Root" Background="{TemplateBinding Background}">
<Grid.Resources>
<ControlTemplate x:Key="TopLeftHeaderTemplate" TargetType="sdk:DataGridColumnHeader">
<Grid x:Name="Root">
<Grid.RowDefinitions>
<RowDefinition/>
<RowDefinition/>
<RowDefinition Height="Auto"/>
</Grid.RowDefinitions>
<Border BorderBrush="#FFC9CACA" BorderThickness="0,0,1,0" Background="#FF1F3B53" Grid.RowSpan="2">
<Rectangle Stretch="Fill" StrokeThickness="1">
<Rectangle.Fill>
<LinearGradientBrush EndPoint=".7,1" StartPoint=".7,0">
<GradientStop Color="#FCFFFFFF" Offset="0.015"/>
<GradientStop Color="#F7FFFFFF" Offset="0.375"/>
<GradientStop Color="#E5FFFFFF" Offset="0.6"/>
<GradientStop Color="#D1FFFFFF" Offset="1"/>
</LinearGradientBrush>
</Rectangle.Fill>
</Rectangle>
</Border>
<Rectangle Fill="#FFDBDCDC" Height="1" Grid.RowSpan="2" StrokeThickness="1" VerticalAlignment="Bottom" Width="Auto"/>
</Grid>
</ControlTemplate>
<ControlTemplate x:Key="TopRightHeaderTemplate" TargetType="sdk:DataGridColumnHeader">
<Grid x:Name="RootElement">
<Grid.RowDefinitions>
<RowDefinition/>
<RowDefinition/>
<RowDefinition Height="Auto"/>
</Grid.RowDefinitions>
<Border BorderBrush="#FFC9CACA" BorderThickness="1,0,0,0" Background="#FF1F3B53" Grid.RowSpan="2">
<Rectangle Stretch="Fill">
<Rectangle.Fill>
<LinearGradientBrush EndPoint=".7,1" StartPoint=".7,0">
<GradientStop Color="#FCFFFFFF" Offset="0.015"/>
<GradientStop Color="#F7FFFFFF" Offset="0.375"/>
<GradientStop Color="#E5FFFFFF" Offset="0.6"/>
<GradientStop Color="#D1FFFFFF" Offset="1"/>
</LinearGradientBrush>
</Rectangle.Fill>
</Rectangle>
</Border>
</Grid>
</ControlTemplate>
</Grid.Resources>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto"/>
<ColumnDefinition/>
<ColumnDefinition Width="Auto"/>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition/>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
</Grid.RowDefinitions>
<sdk:DataGridColumnHeader x:Name="TopLeftCornerHeader" Template="{StaticResource TopLeftHeaderTemplate}" Width="22"/>
<sdk:DataGridColumnHeadersPresenter x:Name="ColumnHeadersPresenter" Grid.Column="1"/>
<sdk:DataGridColumnHeader x:Name="TopRightCornerHeader" Grid.Column="2" Template="{StaticResource TopRightHeaderTemplate}"/>
<Rectangle x:Name="ColumnHeadersAndRowsSeparator" Grid.ColumnSpan="3" Fill="#FFC9CACA" Height="1" StrokeThickness="1" VerticalAlignment="Bottom" Width="Auto"/>
<sdk:DataGridRowsPresenter x:Name="RowsPresenter" Grid.ColumnSpan="2" Grid.Row="1"/>
<Rectangle x:Name="BottomRightCorner" Grid.Column="2" Fill="#FFE9EEF4" Grid.Row="2"/>
<Rectangle x:Name="BottomLeftCorner" Grid.ColumnSpan="2" Fill="#FFE9EEF4" Grid.Row="2"/>
<ScrollBar x:Name="VerticalScrollbar" Grid.Column="2" Margin="0,-1,-1,-1" Orientation="Vertical" Grid.Row="1" Width="18"/>
<Grid Grid.Column="1" Grid.Row="2">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto"/>
<ColumnDefinition/>
</Grid.ColumnDefinitions>
<Rectangle x:Name="FrozenColumnScrollBarSpacer"/>
<ScrollBar x:Name="HorizontalScrollbar" Grid.Column="1" Height="18" Margin="-1,0,-1,-1" Orientation="Horizontal"/>
</Grid>
<sdk:ValidationSummary x:Name="ValidationSummary" Grid.ColumnSpan="3" MaxHeight="90" Grid.Row="3"/>
</Grid>
</Border>
<Border x:Name="DisabledVisualElement" Background="#8CFFFFFF" CornerRadius="2" HorizontalAlignment="Stretch" Height="Auto" IsHitTestVisible="False" Opacity="0" VerticalAlignment="Stretch" Width="Auto"/>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
<Style x:Key="SLDataGridColumnHeaderStyle" TargetType="sdk:DataGridColumnHeader">
<Setter Property="Foreground" Value="#FF000000"/>
<Setter Property="HorizontalContentAlignment" Value="Left"/>
<Setter Property="VerticalContentAlignment" Value="Center"/>
<Setter Property="IsTabStop" Value="False"/>
<Setter Property="SeparatorBrush" Value="#FFC9CACA"/>
<Setter Property="Padding" Value="4"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="sdk:DataGridColumnHeader">
<StackPanel x:Name="Root">
<VisualStateManager.CustomVisualStateManager>
<ei:ExtendedVisualStateManager/>
</VisualStateManager.CustomVisualStateManager>
<VisualStateManager.VisualStateGroups>
<VisualStateGroup x:Name="CommonStates" ei:ExtendedVisualStateManager.UseFluidLayout="True">
<VisualStateGroup.Transitions>
<VisualTransition GeneratedDuration="0:0:0.3"/>
</VisualStateGroup.Transitions>
<VisualState x:Name="Normal"/>
<VisualState x:Name="MouseOver">
<Storyboard>
<ColorAnimation Duration="0" To="#FF448DCA" Storyboard.TargetProperty="(Fill).Color" Storyboard.TargetName="BackgroundRectangle"/>
<ColorAnimation Duration="0" To="#7FFFFFFF" Storyboard.TargetProperty="(Fill).(GradientStops)[3].Color" Storyboard.TargetName="BackgroundGradient"/>
<ColorAnimation Duration="0" To="#CCFFFFFF" Storyboard.TargetProperty="(Fill).(GradientStops)[2].Color" Storyboard.TargetName="BackgroundGradient"/>
<ColorAnimation Duration="0" To="#F2FFFFFF" Storyboard.TargetProperty="(Fill).(GradientStops)[1].Color" Storyboard.TargetName="BackgroundGradient"/>
</Storyboard>
</VisualState>
<VisualState x:Name="Pressed">
<Storyboard>
<ColorAnimation Duration="0" To="#FF448DCA" Storyboard.TargetProperty="(Fill).Color" Storyboard.TargetName="BackgroundRectangle"/>
<ColorAnimation Duration="0" To="#D8FFFFFF" Storyboard.TargetProperty="(Fill).(GradientStops)[0].Color" Storyboard.TargetName="BackgroundGradient"/>
<ColorAnimation Duration="0" To="#C6FFFFFF" Storyboard.TargetProperty="(Fill).(GradientStops)[1].Color" Storyboard.TargetName="BackgroundGradient"/>
<ColorAnimation Duration="0" To="#8CFFFFFF" Storyboard.TargetProperty="(Fill).(GradientStops)[2].Color" Storyboard.TargetName="BackgroundGradient"/>
<ColorAnimation Duration="0" To="#3FFFFFFF" Storyboard.TargetProperty="(Fill).(GradientStops)[3].Color" Storyboard.TargetName="BackgroundGradient"/>
</Storyboard>
</VisualState>
</VisualStateGroup>
<VisualStateGroup x:Name="SortStates" ei:ExtendedVisualStateManager.UseFluidLayout="True">
<VisualStateGroup.Transitions>
<VisualTransition GeneratedDuration="0:0:0.3"/>
</VisualStateGroup.Transitions>
<VisualState x:Name="Unsorted"/>
<VisualState x:Name="SortAscending">
<Storyboard>
<DoubleAnimation Duration="0" To="1.0" Storyboard.TargetProperty="Opacity" Storyboard.TargetName="SortIcon"/>
</Storyboard>
</VisualState>
<VisualState x:Name="SortDescending">
<Storyboard>
<DoubleAnimation Duration="0" To="1.0" Storyboard.TargetProperty="Opacity" Storyboard.TargetName="SortIcon"/>
<DoubleAnimation Duration="0" To="-.9" Storyboard.TargetProperty="(RenderTransform).ScaleY" Storyboard.TargetName="SortIcon"/>
</Storyboard>
</VisualState>
</VisualStateGroup>
</VisualStateManager.VisualStateGroups>
<Grid Height="24" Width="147">
<Rectangle x:Name="BackgroundRectangle" Fill="#FF1F3B53" Stretch="Fill" Margin="0,0,-1,0"/>
<Rectangle x:Name="BackgroundGradient" Stretch="Fill" Margin="0,0,-1,0">
<Rectangle.Fill>
<LinearGradientBrush EndPoint=".7,1" StartPoint=".7,0">
<GradientStop Color="#FCFFFFFF" Offset="0.015"/>
<GradientStop Color="#F7FFFFFF" Offset="0.375"/>
<GradientStop Color="#E5FFFFFF" Offset="0.6"/>
<GradientStop Color="#D1FFFFFF" Offset="1"/>
</LinearGradientBrush>
</Rectangle.Fill>
</Rectangle>
<Grid HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" Margin="4,4,0,4" VerticalAlignment="{TemplateBinding VerticalContentAlignment}">
<Grid.ColumnDefinitions>
<ColumnDefinition/>
<ColumnDefinition Width="Auto"/>
</Grid.ColumnDefinitions>
<ContentPresenter Content="{TemplateBinding Content}"/>
<Path x:Name="SortIcon" Grid.Column="1" Data="F1 M -5.215,6.099L 5.215,6.099L 0,0L -5.215,6.099 Z " Fill="#FF444444" HorizontalAlignment="Left" Margin="4,0,0,0" Opacity="0" RenderTransformOrigin=".5,.5" Stretch="Uniform" VerticalAlignment="Center" Width="8">
<Path.RenderTransform>
<ScaleTransform ScaleY=".9" ScaleX=".9"/>
</Path.RenderTransform>
</Path>
</Grid>
<Rectangle x:Name="VerticalSeparator" Fill="{TemplateBinding SeparatorBrush}" Visibility="{TemplateBinding SeparatorVisibility}" VerticalAlignment="Stretch" Width="1" HorizontalAlignment="Right" Margin="0,0,-1,0" d:LayoutOverrides="Width"/>
</Grid>
<Grid Height="24" Background="#FFE4E4E4">
<TextBox TextWrapping="Wrap" Text="TextBox" d:LayoutOverrides="Width"/>
</Grid>
</StackPanel>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</sdk:DataGrid.Resources>
<sdk:DataGrid.Style>
<StaticResource ResourceKey="SLDataGridStyle"/>
</sdk:DataGrid.Style>
<sdk:DataGrid.ColumnHeaderStyle>
<StaticResource ResourceKey="SLDataGridColumnHeaderStyle"/>
</sdk:DataGrid.ColumnHeaderStyle>

最佳答案

可以将自定义控件添加到 Silverlight DataGrid 的 header ,但是如何操作并不明显,而且有点麻烦。

你需要做两件事:

  1. 通过将 ContentTemplate 应用于列标题的 HeaderStyle 来指定要添加到列标题的控件。为此,您需要以下两个 XAML 命名空间声明:

    xmlns:sdk="http://schemas.microsoft.com/winfx/2006/xaml/presentation/sdk"
    xmlns:dataprimitives="clr-namespace:System.Windows.Controls.Primitives;assembly=System.Windows.Controls.Data"
    <sdk:DataGridTemplateColumn Binding="...">
    <sdk:DataGridTemplateColumn.HeaderStyle>
    <Style TargetType="dataprimitives:DataGridColumnHeader">
    <Setter Property="ContentTemplate">
    <Setter.Value>
    <DataTemplate>
    <StackPanel Orientation="Horizontal">
    <CheckBox IsChecked="{Binding Path=SomeFlag, Mode=TwoWay}" />
    <TextBlock Text="Header text" />
    </StackPanel>
    </DataTemplate>
    </Setter.Value>
    </Setter>
    </Style>
    </sdk:DataGridTemplateColumn.HeaderStyle>
    <!-- other DataGridTemplateColumn stuff -->
    <sdk:DataGridTemplateColumn>

    在这个例子中,我使用了一个 CheckBox 和一个绑定(bind)到 View 模型属性 SomeFlagIsChecked 属性,以及一个 文本 block 。我在这个例子中使用了 DataGridTemplateColumn,但这种方法也适用于 DataGridTextColumnDataGridCheckBoxColumn,前提是你替换了 sdk:DataGridTemplateColumn.HeaderStyle sdk:DataGridTextColumn.HeaderStyle 以及类似的 DataGridCheckBoxColumn

  2. 如果您只想向列标题添加静态内容,则无需执行任何其他操作。但是,如果您希望使用数据绑定(bind),则需要进一步的步骤,否则 header 中控件的数据上下文将无法正确设置。这需要一些代码隐藏。

    以下方法在可视化树中搜索 DataGridColumnHeader 中的 ContentPresenter 并设置这些 ContentPresenter< 的 DataContext/s:

    using System.Windows;
    using System.Windows.Controls;
    using System.Windows.Controls.Primitives;
    using System.Windows.Media;

    /// <summary>
    /// Sets the DataContext of each column header within the given data-grid.
    /// </summary>
    /// <param name="dataGrid">The DataGrid.</param>
    /// <param name="dataContext">The data-context to set.</param>
    public static void SetHeaderDataContexts(DataGrid dataGrid, object dataContext)
    {
    // First we look for a DataGridColumnHeadersPresenter.
    DataGridColumnHeadersPresenter colsPresenter = GetObjectOfType<DataGridColumnHeadersPresenter>(dataGrid);
    if (colsPresenter == null)
    {
    return;
    }

    // The ColumnHeadersPresenter contains all of the column headers as
    // direct children. Within each column header is a ContentPresenter,
    // whose DataContext will normally be null. For each ContentPresenter
    // found, set its DataContext to be that given.
    int colHeaderCount = VisualTreeHelper.GetChildrenCount(colsPresenter);
    for (int i = 0; i < colHeaderCount; ++i)
    {
    var header = VisualTreeHelper.GetChild(colsPresenter, i) as DataGridColumnHeader;
    if (header != null)
    {
    ContentPresenter contentPresenter = GetObjectOfType<ContentPresenter>(header);
    if (contentPresenter != null)
    {
    contentPresenter.DataContext = dataContext;
    }
    }
    }
    }

    /// <summary>
    /// Returns the first descendant object of the given parent object within
    /// the visual tree that is an instance of the specified type.
    /// </summary>
    /// <remarks>
    /// The visual tree is searched in a depth-first manner, and the first
    /// object of type <c>TObject</c> found within the tree is returned. If no
    /// control of this type is found, <c>null</c> is returned instead.
    /// </remarks>
    /// <typeparam name="TObject">The type of object to search for. This must
    /// be a subclass of <see cref="DependencyObject"/>.</typeparam>
    /// <param name="parent">The parent control to search within.</param>
    /// <returns>
    /// The first control of the specified type found, or <c>null</c> if none
    /// were found.
    /// </returns>
    public static TObject GetObjectOfType<TObject>(DependencyObject parent) where TObject : DependencyObject
    {
    int count = VisualTreeHelper.GetChildrenCount(parent);
    for (int i = 0; i < count; ++i)
    {
    DependencyObject child = VisualTreeHelper.GetChild(parent, i);
    if (child is TObject)
    {
    return child as TObject;
    }
    else
    {
    TObject obj = GetObjectOfType<TObject>(child);
    if (obj != null)
    {
    return obj;
    }
    }
    }

    return null;
    }

    唯一需要做的就是调用 SetHeaderDataContexts。我发现从用户控件构造函数调用它不起作用,从 Loaded 事件调用它也不起作用(在这两种情况下都没有效果)。从网格的 LayoutUpdated 事件调用它确实不起作用,因为这会引发异常。

    但是,在构造函数中使用

    调用它
        Dispatcher.BeginInvoke(() => SetHeaderDataContexts(theDataGrid, this.DataContext));

    确实有效。

致谢:设置 ContentTemplate 的想法来自 Lars Holm Jensen 的 answer to a similar question ,通过可视化树搜索的思路来自a blog post from Manas Patnaik .这两个链接都是通过 a similar question 找到的.

关于Silverlight DataGrid 控件自定义列标题,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/10624741/

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