c# - 在 EF Core 中过滤 "include"实体

Question

我有以下型号

 public class Person
{
    public int PersonId { get; set; }
    public string Name { get; set; }
    public List<PersonRole> PersonRoles { get; set; }

}

public class RoleInDuty
{
    public int roleInDutyId { get; set; }
    public string Name { get; set; }
    public int typeOfDutyId { get; set; }
    public TypeOfDuty typeOfDuty { get; set; }
    public List<PersonRole> PersonRoles { get; set; }

}
public class PersonRole
{
    public int PersonId { get; set; }
    public Person Person { get; set; }
    public int RoleInDutyId { get; set; }
    public RoleInDuty RoleInDuty { get; set; }
}

现在我可以使用以下代码加载所有人的所有角色:

 var  people = _context.Persons
      .Include(p => p.PersonRoles)
        .ThenInclude(e => e.RoleInDuty).ToList();

但我不想将所有数据加载到 List，我需要根据输入的 typeOfDutyId 加载 PersonRole。
我正在尝试使用以下代码解决此问题

people = _context.Persons
  .Include(p => p.PersonRoles
    .Where(t=>t.RoleInDuty.typeOfDutyId == Id)).ToList();

但是VS抛出错误

InvalidOperationException: The Include property lambda expression 'p => {from PersonRole t in p.PersonRoles where ([t].RoleInDuty.typeOfDutyId == __typeOfDuty_typeOfDutyId_0) select [t]}' is invalid. The expression should represent a property access: 't => t.MyProperty'. To target navigations declared on derived types, specify an explicitly typed lambda parameter of the target type, E.g. '(Derived d) => d.MyProperty'. For more information on including related data, see http://go.microsoft.com/fwlink/?LinkID=746393.

据我所知，我无法访问属性 RoleInDuty.typeOfDutyId 因为我还没有包括它。

我用下面的代码解决了这个问题

people = _context.Persons
  .Include(p => p.PersonRoles)
    .ThenInclude(e=>e.RoleInDuty).ToList();       
foreach (Person p in people)
{
  p.PersonRoles = p.PersonRoles
    .Where(e => e.RoleInDuty.typeOfDutyId == Id)
    .ToList();
}

Answer 1

devnull显示下一个 How to filter "Include" entities in entity framework? ，并且有同样的问题，我阅读了它，并找到了答案。解决我的问题可以用下一个:

var temp = _context.Persons.Select(s => new
  {
    Person = s,
    PersonRoles= s.PersonRoles
      .Where(p => p.RoleInDuty.typeOfDutyId == this.typeOfDuty.typeOfDutyId)
      .ToList()
  }).ToList();