2

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制......我正在尝试自定义列标题但无法获得它。我需要在标题中添加一些其他控件并在代码端访问它们。有没有办法做到这一点？

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>

4

3 回答 3

5

可以将自定义控件添加到 Silverlight DataGrid 的标题中，但是如何做到这一点并不明显，而且有点麻烦。

您需要做两件事：

  1. ContentTemplate通过将 a应用于列标题的 来指定要添加到列标题的控件HeaderStyle。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>

    在此示例中，我使用了一个CheckBox带有IsChecked绑定到视图模型属性的属性SomeFlag的 a，以及一个TextBlock. 我DataGridTemplateColumn在这个例子中使用了 a ，但这种方法也应该适用于DataGridTextColumn并DataGridCheckBoxColumn提供你替换sdk:DataGridTemplateColumn.HeaderStyle为sdk:DataGridTextColumn.HeaderStyle和 类似的 for DataGridCheckBoxColumn。

  2. 如果您只想将静态内容添加到列标题，则无需执行任何其他操作。但是，如果您希望使用数据绑定，则需要进一步的步骤，否则标题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。

    以下方法在可视树中搜索ContentPresenters 中DataGridColumnHeader的 s 并设置DataContext这些 s 的ContentPresenters：

    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（在这两种情况下它都没有效果）。从网格事件中调用它LayoutUpdated确实不起作用，因为这会导致抛出异常。

    但是，通过使用在构造函数中调用它

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

    似乎确实有效。

致谢：设置的想法ContentTemplate来自 Lars Holm Jensen对类似问题的回答，搜索可视化树的想法来自 Manas Patnaik 的博客文章。这两个链接都是通过一个类似的问题找到的。

于 2012-07-14T17:52:12.873 回答
3

卢克的回答非常好。

但是，我发现当我将ComboBox放入标题模板时，在选择 Combo 中的项目或调整列大小时，绑定（在 Luke 答案的第（2）部分的代码隐藏中设置）消失了。这是因为在调整列大小时会重新创建列标题，因此绑定会丢失。

我通过像这样设置绑定来修复它 -

XAML -

       <DataTemplate>
            <StackPanel Orientation="Horizontal" Loaded="HeaderTemplate_OnLoaded" >
                <CheckBox IsChecked="{Binding Path=SomeFlag, Mode=TwoWay}" />
                <TextBlock Text="Header text" />
            </StackPanel>
       </DataTemplate>

代码隐藏 -

    private void HeaderTemplate_OnLoaded(object sender, RoutedEventArgs e)
    {
        ((FrameworkElement)sender).DataContext = this.DataContext;
    }

这对我来说每次都没有问题。

于 2013-11-28T22:07:45.927 回答
0

确实可以更改列标题的样式。我试图使标题文本居中，并且此链接的技术对我有用：Silverlight DataGrid Header Horizo​​ntal Alignment

于 2012-06-19T06:32:38.907 回答