DataGrid标题头居中属性设置HorizontalContentAlignment、分割线设置、背景色、前景色等设置：

<DataGrid.ColumnHeaderStyle>
         <Style TargetType="DataGridColumnHeader">
               <Setter Property="HorizontalContentAlignment" Value="Center"></Setter>
               <Setter Property="Background" Value="#001f55"></Setter>
               <Setter Property="Foreground" Value="#17acae"></Setter>
               <Setter Property="BorderThickness" Value="1" />
               <Setter Property="BorderBrush" Value="#17acae" /> 
          </Style>
</DataGrid.ColumnHeaderStyle>
举个栗子：

想要一个效果如图的表头：
 <DataGrid.ColumnHeaderStyle>
                <Style TargetType="DataGridColumnHeader">
                    <Setter Property="HorizontalContentAlignment" Value="Center">
                    </Setter>
                    <Setter Property="Background" Value="#f5f5f5"></Setter>
                    <Setter Property="Foreground" Value="Black"></Setter>
                    <Setter Property="BorderThickness" Value="1" />
                    <Setter Property="BorderBrush" Value="Gray" />
                </Style>
            </DataGrid.ColumnHeaderStyle>
            <DataGrid.Columns>
                <DataGridTextColumn Header="姓名" Width="80" Binding="{Binding Number}" Foreground="Gray"/>
                <DataGridTextColumn Header="等级" Width="130" Binding="{Binding Number}" Foreground="Gray"/>
                <DataGridTextColumn Header="专注时间" Width="20*" Binding="{Binding FileName}">
                    <DataGridTextColumn.ElementStyle>
                        <Style TargetType="TextBlock">
                            <Setter Property="TextWrapping" Value="Wrap"/>
                            <Setter Property="HorizontalAlignment" Value="Center"/>
                            <Setter Property="Height" Value="auto"/>
                        </Style>
                    </DataGridTextColumn.ElementStyle>
                </DataGridTextColumn>
</DataGrid.Columns>
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