EFCore Linq Then然后包括两个外键到同一个表

Question

有没有人看到我在做什么错了？
ProjectActivityTasks具有UnitOfMeasureId和ProjectActivityTaskTypeId。随着它的写法，它认为UnitOfMeasure去ProjectActivityTaskType。它示数出来就ThenInclude为UnitOfMeasure说

ProjectActivityTaskType不包含定义UnitOfMeasure

这是正确的。 UnitOfMeasure转到ProjectActivityTasks。

我引用此页面，但它似乎并没有这样的工作方式：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

你可以（也应该）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();