如何从LINQ查询中的第二个表中拉出一列加入

Question

我有以下linq查询可以正常工作，但我想从context.Emps中将一列（CompanyId）与来自上下文的结果一起拖放到结果中.BillingProfiles。我如何修改下面的select（select prof）以包含所述列？

var query = (from prof in context.BillingProfiles 
      join emp in context.Emps on prof.ID equals emp.ID 
      join grp in context.BillingGroups on prof.GroupID equals grp.GroupID 
      where (prof.EndDate == null) && (grp.System == "sysGrp") && (prof.ID == id) 
      select prof).Distinct() 
      .Select(x => new OpId() 
      { 
       id = x.ID,           
       GroupId = x.GroupID, 
       OpId = x.OpID, 
       StartDate = x.StartDate, 
       EndDate = x.EndDate, 
       AddedOn = x.AddedOn, 
       AddedBy = x.AddedBy, 
       RemovedOn = x.RemovedOn, 
       RemovedBy = x.RemovedBy, 
       Prodid = x.ProdID, 
      }); 

感谢

Answer 1

项目包含那些过于匿名对象：

var query = from prof in context.BillingProfiles 
      join emp in context.Emps on prof.ID equals emp.ID 
      join grp in context.BillingGroups on prof.GroupID equals grp.GroupID 
      where prof.EndDate == null && prof.ID == id && grp.System == "sysGrp" 
      select new { prof, emp.CompanyId, grp };