<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"
    xmlns:dataprimitives="clr-namespace:System.Windows.Controls.Primitives;assembly=System.Windows.Controls.Data"
    mc:Ignorable="d" xmlns:data="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Data" x:Class="SilverlightClient.MainPage"
    d:DesignWidth="320" d:DesignHeight="320">
    <Grid x:Name="LayoutRoot" Width="320" Height="320" Background="White">
    <StackPanel Orientation="Vertical" Width="320" Height="320">
        <data:DataGrid x:Name="dgEmployee" AutoGenerateColumns="False" Margin="8,8,0,71" Background="#FFDEF2F0" FontSize="14" HorizontalAlignment="Left" Width="263" Height="156">
            <data:DataGrid.Columns>
                <data:DataGridTextColumn Header="数量" Width="80" Binding="{Binding Quantity,Mode=TwoWay}"/>
                <data:DataGridTextColumn Header="单价" Width="80" Binding="{Binding Price,Mode=TwoWay}"/>
                <data:DataGridTextColumn Header="总数" Width="100" Binding="{Binding Total,Mode=TwoWay}"/>
            </data:DataGrid.Columns>
        </data:DataGrid>
        <TextBlock FontSize="14" x:Name="dataTotal" TextAlignment="Right" Height="31" Margin="8,-110,49,0"/>
    </StackPanel>
    </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;

namespace SilverlightClient
...{
    public class Products
    ...{
        public int Quantity ...{ get; set; }
        public int Price ...{ get;set;}
        public int Total ...{ get; set; }
    }

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

        void MainPage_Loaded(object sender, RoutedEventArgs e)
        ...{
            List em1 = new List ();
            em1.Add(new Products() ...{ Quantity = 20, Price = 130, Total = 2600 });
            em1.Add(new Products() ...{ Quantity = 5, Price = 800, Total = 4000 });
            em1.Add(new Products() ...{ Quantity = 10, Price = 2000, Total = 20000 });
          
            dgEmployee.ItemsSource = em1;
            int total = 0;
            foreach (object o in dgEmployee.ItemsSource)
            ...{
                Products item = o as Products;
                total += item.Total;
            }
            dataTotal.Text = "总计：" + total.ToString();
        }
    }
}