如何通過Linq-to-Entity獲得關系實體對象？

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();

        }

我要用

usr.MemberShip.Email

MemberShip是外部表的外部表 。

aspnet_Roles-> aspnet_Users-> Membership.Email

但我遇到一個錯誤： ObjectContext實例已被處置，不能再用於需要連接的操作。

我如何將成員對象包括到結果中？？？？

Answer 1

您很可能需要包括懸掛在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();
 }