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();

        }

我要使用

usr.MemberShip.Email

MemberShip 是外部表的外部表。

aspnet_Roles->aspnet_Users->Membership.Email

但我得到一个错误：ObjectContext 实例已被释放，不能再用于需要连接的操作。

如何在结果中包含成员资格对象??????

Answer 1

您很可能需要包括挂在 aspnet_User 表之外的 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();
 }