實體框架查詢錯誤？

Question

我收到此錯誤：

不能在LINQ to Entities查詢中構造實體或復雜類型'Model.Members'。

用我的代碼：

public List<Members> getTeamMembers(String tem_reference)
{
        var query = from c in cecbContext.Projects
                    join b in cecbContext.TeamMembers on c.proj_team equals b.team_reference
                    join d in cecbContext.Members on b.mem_reference equals d.mem_reference
                    where c.proj_reference == tem_reference
                    select new Members
                    {
                        mem_reference = d.mem_reference
                    };
    return query.ToList<Members>();
}

Answer 1

我認為您因為嘗試投影映射的實體而遇到問題，並且此答案將告訴您更多信息： https : //stackoverflow.com/a/5325861/2208058

我認為這可能對您有用：

var query = from c in cecbContext.Projects
                join b in cecbContext.TeamMembers on c.proj_team equals b.team_reference
                join d in cecbContext.Members on b.mem_reference equals d.mem_reference
                where c.proj_reference == tem_reference
                select d.mem_reference;
return query.Select(ref => new Members { mem_reference = d.mem_reference  }).ToList();