LINQ，多到許多請求

Question

我有ID字段的表的用戶，有表

Services 
    ID 
    ServiceName 

，具有表

UserServices 
    UserID 
    ServiceID 

類：

User 
Service 

類用戶有財產收集UserServices

我需要cr eate LINQ請求獲取所有用戶，其中至少有一項服務，例如，用戶擁有ID=5。 如何製作此LINQ？由於

Answer 1

我想你也有

User 
    UserID 
    Name 

然後你可以鍵入像這樣

from user in Users 
where user.UserServices.Any(
    userService => userService.Service.Any(
     service => service.UserServices.Any(
      userService2 => userService2.UserID == 5))) 
select user 

Answer 2

var usersOfService = from user in Users 
        where user.UserServices.Where(us => us.ID == 5).Count() > 0 
        select user;