c# - 在 LINQ 查询中，如何使用 .Include() 按包含的表列进行排序？

Question

我有这个表结构:

我有这个 LINQ 查询:

var query = (from p in context.People.Include("PeopleClub").Include("PeopleClub.Club")
             orderby p.Name
             select p).ToList();

是否可以这样做:

var query = (from p in context.People
                              .Include("PeopleClub")
                              .Include("PeopleClub.Club")
             orderby p.Name, p.PeopleClub.DisplaySequence
             select p).ToList();

更新:使用 Entity Framework 4.0

更新 2:我放弃了。参见 this similar question另一种方法。我最终在没有 .Include() 的情况下重写了我的查询。

Answer 1

通过导航属性尝试:

using System.Data.Entity;                                  // notice using

var q = from p in context.People
                          .Include(p => p.PeopleClub)      // notice lambda instead of string
                          .Include(p => p.PeopleClub.Club) // you may not need that though
        orderby p.FirstName, p.ClubPerson.DisplaySequence
        select p;

或常规加入:

var q = from p in db.People
        join pc in db.PeopleClub on p.PersonID equals pc.PersonID
        join c in db.Clubs on pc.ClubID equals c.ClubID
        orderby p.FirstName, pc.DisplaySequence
        select p;