List
     
       id_list = new List
      
       () { 1 };//测试数据... List
       
         guid_list = (from uinfo in db.UserInfo                                          where id_list.Contains(uinfo.ID)                                          select new                                          {                                              uid= uinfo.Guid                                          }).ToList().Select(u => u.uid).ToList
        
         ();