如何通过Linq-to-Entity获取关系实体对象？

Question

 using (var dataContext = new realtydbEntities())
        {
            var user =
                (
               from aspnet_Roles rol in dataContext.aspnet_Roles.Include("aspnet_Users")
               from aspnet_Users usr in rol.aspnet_Users
               where rol.RoleId == roleID
               select usr
                );
            return user.ToList();

        }

我想用

  

usr.MemberShip.Email

MemberShip是外表的外表。

aspnet_Roles-＆GT; aspnet_Users-＆GT; Membership.Email

但是我收到了一个错误： ObjectContext实例已被处理，不能再用于需要连接的操作。

如何将成员资格对象包含在结果??????

中

Answer 1

您很可能需要包含挂起aspnet_User表的aspnet_Membership表，如下所示：

using (var dataContext = new realtydbEntities())
{
      var user =
      (
          from aspnet_Roles rol in dataContext.aspnet_Roles.Include("aspnet_Users")
          from aspnet_Users usr in rol.aspnet_Users.Include("aspnet_Membership")
          where rol.RoleId == roleID
          select usr
      );
   return user.ToList();
 }