在Silverlight中更改Datagrid标头的背景颜色

Question

我想在Silverlight中更改Datagrid标题的背景颜色。

Answer 1

虽然DataGrid不公开Header Background属性，但它确实具有ColumnHeaderStyle的属性。使用DaniCE之前为单个列建议的技术，我们可以替换所有标题列的标题模板，包括右侧的空白空间。替换标题的整个模板的缺点是我们丢失了默认标题模板中存在的排序箭头和分隔符。幸运的是，我们可以使用template browser提取正在使用的默认模板，然后修改它的副本。

在这里，我将一个快速示例放在一起，它将列标题的背景更改为LightBlue，同时保留分隔符和排序。查看template browser中的默认DataGridColumnHeader模板，了解当鼠标悬停在ColumnHeader上时如何处理修改背景。

<data:DataGrid x:Name="grid">
    <data:DataGrid.ColumnHeaderStyle>
        <Style 
            xmlns:primitives="clr-namespace:System.Windows.Controls.Primitives;assembly=System.Windows.Controls.Data" 
            xmlns:vsm="clr-namespace:System.Windows;assembly=System.Windows"
            TargetType="primitives:DataGridColumnHeader" >
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="primitives:DataGridColumnHeader">
                        <Grid Name="Root">
                            <vsm:VisualStateManager.VisualStateGroups>
                                <vsm:VisualStateGroup x:Name="SortStates" >
                                    <vsm:VisualStateGroup.Transitions>
                                        <vsm:VisualTransition GeneratedDuration="00:00:0.1" />
                                    </vsm:VisualStateGroup.Transitions>
                                    <vsm:VisualState x:Name="Unsorted" />
                                    <vsm:VisualState x:Name="SortAscending">
                                        <Storyboard>
                                            <DoubleAnimation Storyboard.TargetName="SortIcon" Storyboard.TargetProperty="Opacity" Duration="0" To="1.0" />
                                        </Storyboard>
                                    </vsm:VisualState>
                                    <vsm:VisualState x:Name="SortDescending">
                                        <Storyboard>
                                            <DoubleAnimation Storyboard.TargetName="SortIcon" Storyboard.TargetProperty="Opacity" Duration="0" To="1.0" />
                                            <DoubleAnimation Storyboard.TargetName="SortIconTransform" Storyboard.TargetProperty="ScaleY" Duration="0" To="-.9" />
                                        </Storyboard>
                                    </vsm:VisualState>
                                </vsm:VisualStateGroup>
                            </vsm:VisualStateManager.VisualStateGroups>
                            <Grid.RowDefinitions>
                                <RowDefinition Height="*" />
                                <RowDefinition Height="*" />
                                <RowDefinition Height="Auto" />
                            </Grid.RowDefinitions>
                            <Grid.ColumnDefinitions>
                                <ColumnDefinition Width="Auto" />
                                <ColumnDefinition Width="*" />
                                <ColumnDefinition Width="Auto" />
                            </Grid.ColumnDefinitions>
                            <Rectangle x:Name="BackgroundRectangle" Stretch="Fill" Fill="LightBlue" Grid.ColumnSpan="2" Grid.RowSpan="2"  />
                            <ContentPresenter Grid.RowSpan="2" Content="{TemplateBinding Content}" Cursor="{TemplateBinding Cursor}" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}" Margin="{TemplateBinding Padding}" />
                            <Rectangle Name="VerticalSeparator" Grid.RowSpan="2" Grid.Column="2" Width="1" VerticalAlignment="Stretch" Fill="{TemplateBinding SeparatorBrush}" Visibility="{TemplateBinding SeparatorVisibility}" />
                            <Path Grid.RowSpan="2" Name="SortIcon" RenderTransformOrigin=".5,.5" HorizontalAlignment="Left" VerticalAlignment="Center" Opacity="0" Grid.Column="1" Stretch="Uniform" Width="8" Data="F1 M -5.215,6.099L 5.215,6.099L 0,0L -5.215,6.099 Z ">
                                <Path.Fill>
                                    <SolidColorBrush Color="#FF444444" />
                                </Path.Fill>
                                <Path.RenderTransform>
                                    <TransformGroup>
                                        <ScaleTransform x:Name="SortIconTransform" ScaleX=".9" ScaleY=".9"  />
                                    </TransformGroup>
                                </Path.RenderTransform>
                            </Path>
                        </Grid>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>
    </data:DataGrid.ColumnHeaderStyle>
</data:DataGrid>

希望这可以帮助！

Answer 2

我提出了一个“清洁”的解决方案..希望它适合你。我只是覆盖DataGrid，并暴露了GetTemplateChild方法。使用它，您可以访问DataGridColumnHeaderPresenter和其中包含的DataGridColumnHeaders ...

1）覆盖datagrid

/// <summary>
/// Extends the DataGrid so that it's possible to access the template objects
/// </summary>
public class DataGridEx : System.Windows.Controls.DataGrid
{
    /// <summary>
    /// Exposes Template items
    /// </summary>
    public Object GetTemplateObject(String name)
    {
        return this.GetTemplateChild(name);
    }
}

2）改变背景

DataGridEx grid = new DataGridEx（）;

...应用模板后......

DataGridColumnHeadersPresenter obj = DataGrid.GetTemplateObject（“ColumnHeadersPresenter”）as DataGridColumnHeadersPresenter;

DataGridColumnHeader h = obj.Children [0] as DataGridColumnHeader;

h.Background = new SolidColorBrush（Colors.Red）;