DataGrid列头标题居中及列中文本居中

1 <Style x:Key="ColumnHeaderStyleC" TargetType="DataGridColumnHeader">
2     <Setter Property="HorizontalContentAlignment" Value="Center"/>
3     <Style.Triggers>
4          <Trigger Property="IsMouseOver" Value="True">
5                <Setter Property="ToolTip" Value="Click to sort."/>
6          </Trigger>
7     </Style.Triggers>
8 </Style>

<DataGrid  Name="AlarmDataDG" ColumnHeaderStyle="{DynamicResource ColumnHeaderStyleC}" BeginningEdit="AlarmDataDG_BeginningEdit" CellEditEnding="AlarmDataDG_CellEditEnding">

1 <DataGridTemplateColumn Header="序号" Visibility="Hidden">
2    <DataGridTemplateColumn.CellTemplate>
3           <DataTemplate>
4                <TextBlock Text="{Binding Path=RowId}" HorizontalAlignment="Center"/>
5           </DataTemplate>
6    </DataGridTemplateColumn.CellTemplate>
7 </DataGridTemplateColumn>