LINQ to SQL - 截断十进制数据类型而不是舍入

using System;
using System.Linq;
using System.Data.Linq;
using System.Data.Linq.Mapping;

[Table(Name="Orders")]
public class Order
{
    [Column(IsPrimaryKey=true)]
    public int OrderID { get; set; }

    [Column]
    public decimal TotalAmount { get; set; }
}

class Program
{
    static void Main(string[] args)
    {
        DataContext db = new DataContext("C:\\NORTHWND.MDF");

        var orders = from o in db.GetTable<Order>()
                     select new
                     {
                         OrderID = o.OrderID,
                         TruncatedTotalAmount = Math.Truncate(o.TotalAmount)
                     };

        foreach (var order in orders)
        {
            Console.WriteLine("OrderID: {0}, Truncated Total Amount: {1}", order.OrderID, order.TruncatedTotalAmount);
        }
    }
}