C# I'；我有一个问题，重复使用包括EF 5。我做错了什么？

我对以下代码有问题

public IEnumerable<BillingConfiguration> GetBillingConfigurationsForAccount(int accountId, DateTime? effectiveDate)
    {
        var result = new List<BillingConfiguration>();
        var accountIds = new List<int>();
        var billingGroupIds = new List<int>();

        using (var context = new GbContext())
        {
            var account = context.Accounts.Where(a => a.AccountId == accountId).SingleOrDefault();
            if (account.ParentAccountId == null) // This is a parent account
            {
                // Get list of sub account ids
                accountIds = context.Accounts.Where(a => a.ParentAccountId == accountId).Select(x => x.AccountId).ToList();
                accountIds.Add(accountId);
            }
            else // This is a sub account
            {
                accountIds.Add(accountId);
            }

            // Get list of Billing Configurations for all accountIds
            IQueryable<BillingConfigurationAccount> accountQuery = context.BillingConfigurationAccounts
                .Where(a => accountIds.Contains(a.AccountId)).AsQueryable();
            AddBillingConfigurationAccountIncludes(accountQuery);
            var accountBillingConfigurations = accountQuery.ToList();

            //IQueryable<BillingConfigurationAccount> accountQuery = context.BillingConfigurationAccounts;
            //AddBillingConfigurationAccountIncludes(accountQuery);
            //accountQuery = accountQuery.Where(a => accountIds.Contains(a.AccountId));
            //var accountBillingConfigurations = accountQuery.ToList();   

            if (accountBillingConfigurations.HasValues())
            {
                accountBillingConfigurations.ForEach(x => result.Add(x.BillingConfiguration));
            }

            return result;
        }
    }
private void AddBillingConfigurationAccountIncludes(IQueryable<BillingConfigurationAccount> query)
    {
        query = query
            .Include(p => p.BillingConfiguration)
            .Include(p => p.BillingConfiguration.BillingConfigurationLevel)
            .Include(p => p.BillingConfiguration.BillType)
            .Include(p => p.BillingConfiguration.PayerOptionType)
            .Include(p => p.BillingConfiguration.BillModeOptions)
            .Include(p => p.BillingConfiguration.BillModeOptions.Select(m => m.BillMode))
            .Include(p => p.BillingConfiguration.BillModeOptions.Select(m => m.FirstPastDueDateOptionsType))
            .Include(p => p.BillingConfiguration.BillModeOptions.Select(m => m.LapseNoticeOptionsType))
            .Include(p => p.BillingConfiguration.BillModeOptions.Select(m => m.PaymentDueDateOptionsType))
            .Include(p => p.BillingConfiguration.BillModeOptions.Select(m => m.PaymentGracePeriodType))
            .Include(p => p.BillingConfiguration.BillModeOptions.Select(m => m.SecondPastDueDateOptionsType))
            .Include(p => p.BillingConfiguration.BillModeOptions.Select(m => m.BillModeOptionPaymentMethods))
            .Include(p => p.BillingConfiguration.BillModeOptions.Select(m => m.BillModeOptionPaymentMethods.Select(n => n.PaymentMethodType)));
    }

该代码实际上填写了

BillingConfiguration

实体及其所有子实体。 我想做的事可能吗？如果，那么我做错了什么

谢谢

这是一个微妙的问题

您正确地假设

void SomeMethod(IQueryable<T> query)

在您的情况下，这将成为：

accountQuery = AddBillingConfigurationAccountIncludes(accountQuery);

如果你不相信我，试试Linqpad的这个小程序：）

void Main（）
{
var ints=Enumerable.Range（1,10）.ToArray（）；
其他（综合，11）；
ints.Dump（）；
}
void AddInt（IEnumerable list，int i）
{
list=list.Concat（新[]{i}）；
list.Dump（）；
}

IQueryable<T> SomeMethod(IQueryable<T> query)

accountQuery = AddBillingConfigurationAccountIncludes(accountQuery);

void Main()
{
    var ints = Enumerable.Range(1,10).ToArray();
    AddInt(ints, 11);
    ints.Dump();
}

void AddInt(IEnumerable<int> list, int i)
{
    list = list.Concat(new[] {i});
    list.Dump();
}