EFCore Linq然后将两个外键包含在同一个表中

Question

有谁看到我做错了什么？ ProjectActivityTasks有UnitOfMeasureId和ProjectActivityTaskTypeId。按照它的编写方式，它认为UnitOfMeasure转到ProjectActivityTaskType。 ThenInclude UnitOfMeasure说

，这是错误的

  

ProjectActivityTaskType不包含UnitOfMeasure

的定义

这是正确的。 UnitOfMeasure转到ProjectActivityTasks。

我正在引用此页面，但似乎没有这样做：https://docs.microsoft.com/en-us/ef/core/querying/related-data

var qry = await _projectActivityRepository.GetAll()
.Include(x => x.ProjectActivityVehicles)
  .ThenInclude(x => x.Vehicle)
.Include(x => x.ProjectActivityTasks)
  .ThenInclude(x => x.ProjectActivityTaskType)
  .ThenInclude(x => x.UnitOfMeasure)
.Where(x => x.Id == Id && x.TenantId == (int)AbpSession.TenantId)
.FirstOrDefaultAsync();

Answer 1

您可以（并且应该）重复Include(x => x.ProjectActivityTasks)部分：

var qry = await _projectActivityRepository.GetAll()
.Include(x => x.ProjectActivityVehicles)
  .ThenInclude(x => x.Vehicle)
.Include(x => x.ProjectActivityTasks)
  .ThenInclude(x => x.ProjectActivityTaskType)
.Include(x => x.ProjectActivityTasks)
  .ThenInclude(x => x.UnitOfMeasure)
.Where(x => x.Id == Id && x.TenantId == (int)AbpSession.TenantId)
.FirstOrDefaultAsync();