我有一个 Employee 实体，它有多个 Unit 实体，它们也以各种方式关联（例如，作为经理、主管等）。它们与 Unit 的关系在 UnitRelationships 表中定义，该表包括 IsActive 属性以及 EmployeeId、UnitId 和 RelationshipTypeId 属性。
我想做的是在 Employee 实体上创建特定属性，如下所示：
SupervisedUnits {get;set;}
ManagedUnits{get;set;}
...并配置映射，以便“SupervisedUnits”仅返回存在活动 (IsActive = true) 关系且 RelationshipTypeId='Supervisor' 的单元。与 ManagedUnits 相同类型的东西。
那么，有没有办法在 EF Code First 中执行此操作，以便我可以在我的 LINQ-to-Entities 查询中实际使用这些属性（SupervisedUnits 和 ManagedUnits）？
谢谢
There are probably a couple of ways of doing this.
The "Active" relationship is a one to many between Unit and Employee and the "Inactive" relationship is many-to-many. So set them up as two different relationships and when the relationship is made inactive, move the Supervisor into the InactiveSupervisors. Doing it this way gives you a SupervisedUnits navigation property (as you wanted) and an InActiveSupervisedUnits property
The relationship is many-to-many and has attributes such as IsActive, ActiveFrom and ActiveTo. Now the relationship really needs to be an entity. You could use inheritance on your UnitRelationship entity:
public class SupervisorUnitRelationShip : UnitRelationship{ }
public class ManagerUnitRelationShip : UnitRelationship
{
}
then you can add your navigation properties by type:
public virtual Collection<SupervisorUnitRelationship> SupervisedRelations {get;set;}
public virtual Collection<ManagerUnitRelationship> ManagedRelations {get;set;}
to get to the Units you'll have to go through the UnitRelationship
var SupervisedUnits = SupervisedRelations.Units;