流利的子类-仅将第一个和最后一个记录转换为正确的类型

//This will automatically cast the row into the correct object type based on the value in AccountType
DiscriminateSubClassesOnColumn<string>(\"AccountType\")
            .Formula(String.Format(\"CASE AccountType WHEN {0} THEN \'{1}\' WHEN {2} THEN \'{3}\' ELSE \'{4}\' END\", 
            (int)PaymentMethodType.CheckingAccount, 
            typeof(ACH).Name,
            (int)PaymentMethodType.SavingsAccount,
            typeof(ACH).Name,
            typeof(CreditCard).Name));

public static string PaymentMethodName(this PaymentMethodBase paymentMethod)
{
        if (paymentMethod is ACH)
        {
            var ach = (ACH)paymentMethod;
            return String.Format(\"{0} {1}\", ach.BankName, String.Format(\"XXXX{0}\", ach.AccountNumber.Substring(ach.AccountNumber.Length - 4)));
        }

        if (paymentMethod is CreditCard)
        {
            var creditCard = (CreditCard)paymentMethod;
            return String.Format(\"{0} {1}\", creditCard.Name, creditCard.CreditCardNumber);
        }

        return \"Unknown Payment Method\";
    }

public SelectList PaymentMethodsSelectList
{
    get
    {
        var methods = (from p in PaymentMethods
                       where p != null
                       select new
                       {
                           id = p.PaymentMethodId,
                           name = p.PaymentMethodName()
                       }).OrderBy(x => x.name);

        var results = methods.ToList();

        results.Insert(0, new { id = (int)NewPaymentMethods.ACH, name = \"<New eCheck Account...>\" });
        results.Insert(0, new { id = (int)NewPaymentMethods.CreditCard, name = \"<New Credit Card...>\" });

        return new SelectList(results, \"id\", \"name\");
    }
}

HasMany<PaymentMethodBase>(x => x.PaymentMethods)
    .KeyColumn(\"CustomerId\")
    .Where(y => y.AccountType < 10)
    .Inverse()
    .Cascade.All();