.Include（）.Where（）in Linq to Entities查询

Question

我试图找到所有活动的患者，那些EndOfTreatment == null。

问题是关系有一个复杂的结构。

我与这些数据库图表的东西不是那么好，但我已经做了以下pictue，我想你会明白了吧：

我试图至今：

var ans = ctx 
    .PatientMap 
    .Include(p => p.Doctor) 
    .Include(p => p.Product) 
    .Include(p => p.Institution) 
    .Include(p => p.Doctor.TerritoryDoctorPanel 
     .Where(dp => 
      (dp.Territory.PromotionalLine == p.Product.PromotionalLine) && // issuing 
      (dp.Territory.Active == true)         // lines 
     ) 
    ) 
    .Where(p => 
     (IDProduct == null || p.IDProduct == IDProduct.Value) && 
     (p.EndOfTreatment == null) 
    ) 
    .ToList() 
    .Select(p => new ActivePatientModel 
    { 
     IDPatient = p.ID, 
     Observation = p.Observation, 
     TreatmentPeriod = DateTimeSpan.CompareDates(
      (DateTime)p.StartOfTreatment, DateTime.Now 
     ).Months, 
     NameDoctor = p.Doctor.FullName, 
     CodeDoctor = p.Doctor.Code, 
     CodeInstitution = p.Institution.Code, 
    }) 
    .ToList(); 

我搜索了很多，我得到的最接近是this answer from Moho，其适应会是什么样子：

.SelectMany(p => p.Doctor.TerritoryDoctorPanel) 
    .Where(dp => dp.Territory.PromotionalLine == /*p.Product.PromotionalLine*/) 
                ^^^^^^^^^^ 
               // How can I reference p.Product here? 

---

简历：

• 我需要得到Patients通过Doctors使用一些Product在Territories工作处理。关系存在Product.PromotionalLine = Territory.PromotionalLine。
• IDProduct是int?类型，即：(IDProduct == null || p.IDProduct == IDProduct.Value)

我真的出来的想法如何使它发挥作用。

我欣赏任何建议。

Answer 1

我会尝试一些，我希望我明白你的想法，尽管我不确定我做了什么。

，所以我想你的问题是这样的

我需要通过一些产品在工作新界 医生治疗的患者。关系存在

这里是我该怎么做。

var ans = ctx 
    .PatientMap 
    .Include(p => p.Doctor) 
    .Include(p => p.Product) 
    .Include(p => p.Institution) 
    .Include(p => p.Doctor.TerritoryDoctorPanel 
    .Where(p => 
     // some doctors, doctorIDs is list of all doctors id you want in case you are using id retrieval 
     doctorIDs.Contains(p.DoctorID) && 
     //working in some territory 
     //similar to this, you can filter any doctor Attribute 
     p.Doctor.TerritoryDoctorPanel.Any(t => /*Add condition for TerritoryDoctorPanel here */) && 
     (p.IDProduct == null || p.IDProduct == IDProduct.Value) && 
     (p.EndOfTreatment == null) && 
     // Product Promotion line conditions 
     // also similar to this you can filter any product attribute 
     (p.Product.PromotionalLine.Any(pl => /*Add condition for promotional lines here*/)))    
    .ToList()