Question

我正在尝试使用给定的UserID +链接到具有给定UserID的经理的所有工作来检索链接到员工的所有工作。我按照SQL UNION的方式加入数据集。这是我为此目的编写的代码，但似乎INCLUDE是累积的（第二个工作在第一个检索的数据集上），这不是我的意图（第二组数据必须添加到第一组）：

var list = await db.Employment.AsNoTracking()
    .Where(x => x.Active)
    .Include(x => x.Employee).Where(x => x.Employee.UserID == UserID)
    .Include(x => x.Manager).Where(x => x.Manager.UserID == UserID)
    .ToListAsync();

就业模式

public class Employment : IHasID, IValidatableObject
{
    public int ID { get; set; }
    public int EmployeeID { get; set; }
    public Employee Employee { get; set; }
    public bool Active { get; set; }
    public int? ManagerID { get; set; }
    public Employee Manager { get; set; }
}

员工模型

{
    public int ID { get; set; }
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public int? UserID { get; set; }
    public User User { get; set; }
    public bool Active { get; set; }
    [InverseProperty("Employee")]
    public List<Employment> EmploymentEmployee { get; set; }
    [InverseProperty("Manager")]
    public List<Employment> EmploymentManager { get; set; }
}

后来，我发现有一个Union扩展，所以我尝试使用它：

var list = await
db.Employment.Where(x => x.Active).Include(x => x.Employee)
.Include(x => x.Manager).Where(x => x.Employee.UserID == UserID)
.Union(
db.Employment.Where(x => x.Active).Include(x => x.Employee)
.Include(x => x.Manager).Where(x => x.Manager.UserID == UserID))
.ToListAsync();

...但是这会导致异常：InvalidOperationException：警告为警告'CoreEventId.IncludeIgnoredWarning'的错误异常：导航的Include操作：'x.Employee'被忽略，因为最终无法访问目标导航查询结果。

使用实体框架

0 个答案: