EFCore Linq Then然後包括兩個外鍵到同一個表

Question

有沒有人看到我在做什麼錯了？
ProjectActivityTasks具有UnitOfMeasureId和ProjectActivityTaskTypeId。隨着它的寫法，它認爲UnitOfMeasure去ProjectActivityTaskType。它示數出來就ThenInclude爲UnitOfMeasure說

ProjectActivityTaskType不包含定義UnitOfMeasure

這是正確的。 UnitOfMeasure轉到ProjectActivityTasks。

我引用此頁面，但它似乎並沒有這樣的工作方式：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（也應該）重複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();