C# 从列表中使用AddRange会导致多个数据库跳闸

这是我继承的代码，不是我的设计

正在进行一个大查询以返回对象列表。然后使用查询结果创建自定义对象的列表。存在大量循环，以获取不同的值，例如县、州等。。为了优化代码，我尝试从查询结果中选择不同的值，并使用AddRange将它们添加到新集合中。但是，这会导致对每个值调用SQL

初始查询

        using (var db = new StorageEntities())
        {
            db.Configuration.AutoDetectChangesEnabled = false;

            List<CompanyTitleFeeSchedule> list = db.CompanyTitleFeeScheduleCompanies
                .Include(x => x.Company)
                .Include(x => x.CompanyTitleFeeSchedule)
                .Include(x => x.CompanyTitleFeeSchedule.CompanyTitleFeeScheduleAreas)
                .Include(x => x.CompanyTitleFeeSchedule.CompanyTitleFeeScheduleCompanies)
                .Include(x => x.CompanyTitleFeeSchedule.CompanyTitleFeeScheduleAreas.Select(t => t.County))
                .Include(x => x.CompanyTitleFeeSchedule.CompanyTitleFeeScheduleAreas.Select(t => t.County.State))
                .Where(x => x.CompanyID == id || x.Company.ParentCompanyID == id)
                .Select(x => x.CompanyTitleFeeSchedule).Distinct().ToList();

            return list.Select(item => new VM.CompanyTitleFeeScheduleViewModel(item)).ToList();
        }

---

我已经有几年没有使用EF了，但最近我使用了，您通常需要使用

Include

来加载相关实体和查询。否则，相关实体会根据需要延迟加载

比如：

有关详细信息，请参阅：

这篇文章还告诉您如何在各种场景中禁用延迟加载

           //Get a list of distinct counties and add them to the collection
            Counties.AddRange((from c in data.CompanyTitleFeeScheduleAreas
                group c by c.CountyID
                into cty
                select cty.First())
                .Select(cty => new CountyViewModel
                {
                    CountyID = cty.CountyID,
                    Name = cty.County.Name,
                    StateID = cty.County.StateID
                }));

...
.Select(x => x.CompanyTitleFeeSchedule)
.Include(x => x.CompanyTitleFeeScheduleAreas) // added this.
...