<UserControl
    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"
    mc:Ignorable="d" xmlns:data="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Data" x:Class="SilverlightClient.MainPage"
    d:DesignWidth="320" d:DesignHeight="480">
    <Grid x:Name="LayoutRoot" Background="White" Width="320" Height="480">
        <data:DataGrid x:Name="dgEmployee" Margin="8,8,8,52" FontSize="14" AutoGenerateColumns="False">
            <data:DataGrid.RowGroupHeaderStyles>
                <!-- 顶层分组样式 -->
                <Style TargetType="data:DataGridRowGroupHeader">
                    <Setter Property="PropertyNameVisibility" Value="Collapsed" />
                    <Setter Property="Background" Value="#99225566" />
                    <Setter Property="Foreground" Value="White" />
                    <Setter Property="SublevelIndent" Value="15" />
                </Style>
                <!-- 顶层以下分组样式 -->
                <Style TargetType="data:DataGridRowGroupHeader">
                    <Setter Property="Background" Value="#44225566" />
                </Style>
            </data:DataGrid.RowGroupHeaderStyles>
            <data:DataGrid.Columns>
                <data:DataGridTextColumn Header="工号" Binding="{Binding EmployeeID}"/>
                <data:DataGridTextColumn Header="姓名" Binding="{Binding EmployeeName}"/>
                <data:DataGridTextColumn Header="年龄" Binding="{Binding EmployeeAge}"/>
                <data:DataGridTextColumn Header="部门" Binding="{Binding DepartmentName}"/>
                <data:DataGridTextColumn Header="级别" Binding="{Binding Level}"/>
            </data:DataGrid.Columns>
        </data:DataGrid>
    </Grid>
</UserControl>

using ...System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using System.Windows.Data;
using System.ComponentModel;

namespace SilverlightClient
...{
    public class Employees
    ...{
        public int EmployeeID ...{ get; set; }
        public string EmployeeName ...{ get; set; }
        public int EmployeeAge ...{ get; set; }
        public string DepartmentName ...{ get; set; }
        public string Level ...{ get; set; }
    }

    public partial class MainPage : UserControl
    ...{
        public MainPage()
        ...{
            InitializeComponent();
            this.Loaded += new RoutedEventHandler(MainPage_Loaded);
        }

        public List GetEmployees()
        ...{
            List returnedValue = new List();
            returnedValue.Add(new Employees() ...{ EmployeeID = 1, EmployeeName = "张三", EmployeeAge = 23, DepartmentName = "财务部", Level = "初级" });
            returnedValue.Add(new Employees() ...{ EmployeeID = 2, EmployeeName = "李四", EmployeeAge = 24, DepartmentName = "财务部", Level = "中级" });
            returnedValue.Add(new Employees() ...{ EmployeeID = 3, EmployeeName = "王五", EmployeeAge = 25, DepartmentName = "管理部", Level = "中级" });
            returnedValue.Add(new Employees() ...{ EmployeeID = 4, EmployeeName = "赵六", EmployeeAge = 26, DepartmentName = "管理部", Level = "初级" });
            returnedValue.Add(new Employees() ...{ EmployeeID = 5, EmployeeName = "钱七", EmployeeAge = 27, DepartmentName = "工程部", Level = "中级" });
            returnedValue.Add(new Employees() ...{ EmployeeID = 6, EmployeeName = "孙八", EmployeeAge = 28, DepartmentName = "工程部", Level = "初级" });
            returnedValue.Add(new Employees() ...{ EmployeeID = 7, EmployeeName = "小赵", EmployeeAge = 26, DepartmentName = "财务部", Level = "中级" });
            returnedValue.Add(new Employees() ...{ EmployeeID = 8, EmployeeName = "小钱", EmployeeAge = 28, DepartmentName = "财务部", Level = "高级" });
            return returnedValue;
        }

        void MainPage_Loaded(object sender, RoutedEventArgs e)
        ...{
            PagedCollectionView pcv = new PagedCollectionView(GetEmployees());
            pcv.GroupDescriptions.Add(new PropertyGroupDescription("DepartmentName"));//添加分组信息描述
            pcv.GroupDescriptions.Add(new PropertyGroupDescription("Level"));
            dgEmployee.ItemsSource = pcv;
        }
    }
}