asp.net-mvc – 实体框架 – 无法创建x类型的常量值.在此上下文

工程师模型：

public class engineers
{
    public Guid? Guid { get; set; }
    public string Name { get; set; }
}

我在工程师名单中填写正确的详细信息：

List<engineers> listeng = new List<engineers>();
listeng.Add(new engineers { Name = profile.FirstName + " " + profile.LastName,Guid = GuidEngineer });

到现在为止还挺好.

我的问题如何将工程师名称拉到下面的eng条目：

var tickets = from o in new HelpdeskEntities().Tickets.Where(t => t.TicketState.State == "Open")
                    select new AjaxTickets
                    {
                        TicketID = o.TicketID,TicketSubject = o.TicketSubject,ClientCompanyName = o.ClientCompany.ClientCompanyName,DateOpened = o.DateOpened,**eng** = list.Where(x => x.Guid == o.EngineerID).Select(x => new engineers {Guid = x.Guid,Name=x.Name }).FirstOrDefault().Name

                    };

我也试过了

var tickets = from o in new HelpdeskEntities().Tickets.Where(t => t.TicketState.State == "Open")
                    select new AjaxTickets
                    {
                        TicketID = o.TicketID,**eng** = list.Where(x => x.Guid == o.EngineerID).Select(x => x.Name }).FirstOrDefault()
                    };

我得到的错误是：

Unable to create a constant value of type 'Helpdesk2.ViewModel.engineers'. Only primitive types ('such as Int32,String,and Guid') are supported in this context."}

我有点理解,但不能弄清楚只是为了选择工程师的名字.

提前致谢