如何在LINQ to SQL中编写右侧为null的左外连接？

using System;
using System.Collections.Generic;
using System.Linq;
using System.Data.Linq;

public class LeftOuterJoinExample
{
    public static void Main()
    {
        // 假设有两个表：Customers 和 Orders
        DataClasses1DataContext context = new DataClasses1DataContext();

        var result = from customer in context.Customers
                     join order in context.Orders on customer.CustomerID equals order.CustomerID into orders
                     from o in orders.DefaultIfEmpty()
                     select new
                     {
                         CustomerID = customer.CustomerID,
                         CustomerName = customer.CompanyName,
                         OrderID = o == null ? (int?)null : o.OrderID,
                         OrderDate = o == null ? (DateTime?)null : o.OrderDate
                     };

        foreach (var item in result)
        {
            Console.WriteLine($"Customer ID: {item.CustomerID}, Customer Name: {item.CustomerName}, Order ID: {item.OrderID}, Order Date: {item.OrderDate}");
        }
    }
}