Csharp 数据库操作预计影响1行，但实际影响0行; after _dbContext.SaveChanges();

这是我的主课:

public class Warehouse
{
    public List<WarehouseRelation> WarehouseRelationList { get; private set; } = new List<WarehouseRelation>();

    public void AddWarehouseRelation(
        Guid mainWarehouseId, 
        Guid relatedWarehouseId,
        int warehouseRelationProcessTypeId,
        int createUser, int langId)
    {
        WarehouseRelationList.Add(new WarehouseRelation(mainWarehouseId, relatedWarehouseId, createUser));

    }
}

这是我的关系类，它作为一个列表包含在仓库类中.

 public WarehouseRelation()
 {
      internal WarehouseRelation(Guid mainWarehouseId, Guid relatedWarehouseId, int createUser)
      {
          Id = Guid.NewGuid();
          WarehouseId = mainWarehouseId;
          RelatedWarehouseId = relatedWarehouseId;
          CreateDate = DateTime.Now;
          CreateUser = createUser;
      }
}

这就是我从数据库中获取Warehouse类的方式.Warehouse Relationship也包含在返回结果中.

public async Task PersistAsync()
 {
await _dbContext.SaveChangesAsync();
 }


public async Task<Domain.Warehouse> GetDefaultWarehouse(Guid warehouseId)
{
return await _dbContext.Warehouses.Include(x => x.WarehouseProperty)
                            .Include(x => x.WarehouseRelationList)
.FirstOrDefaultAsync(x => x.Id == warehouseId)
                                                             ;


     }

获取数据后，我将Warehouse Relation添加到Warehouse类的列表中.他们俩都有亲戚.

Warehouse warehouseInfo = _warehouseRepository.GetDefaultWarehouse();

warehouseInfo.AddWarehouseRelation(warehouseInfo.WarehouseId,relatedWarehouseId_userRepository.UserId);

_warehouseRepository.PersistAsync();

这抛出The database operation was expected to affect 1 row(s), but actually affected 0 row(s);个异常.这是正确的，因为我不更新Warehouse本身中的任何属性，但是我认为它应该将新的关系插入到关系表中.

当我判断_dbConext.ChangeTracker.Entry()以查看更改是否被跟踪时，并看到我新添加的关系状态为"已修改"，但我相信它们必须被"添加"才能使EFCore持久化更改.可能正因为如此，它引发了异常.我try 更改新添加的对象状态，但它不能正常工作.

这种实施在EF核心中有效，还是在其范围之外？