LINQ CROSS JOIN錯誤

Question

我得到這個錯誤類型 'System.Data.Objects.ObjectQuery`1[XXX.Model.Cust_ProfileTbl]' 的

對象不能 轉換爲類型 'System.Data.Entity.DbSet`1XXX.Core.Model.Cust_ProfileTbl]'。

當我嘗試CROSS JOIN與LINQ這兩個表。任何人都可以建議我應該怎麼做？

var Cust_ProfileTbl = service.DBContext.Set<Cust_ProfileTbl>(); 
var Cust_GroupTbl = service.DBContext.Set<Cust_GroupTbl>(); 

var test = 
from cg in Cust_GroupTbl 
from c in Cust_ProfileTbl 
select new { intCustGroup = cg.intCustGroup, bintAccountNo = c.bintAccountNo }; 

Cust_ProfileTbl.cs

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Text; 
using System.Threading.Tasks; 
using System.ComponentModel.DataAnnotations; 
using System.ComponentModel.DataAnnotations.Schema; 
namespace XXXX.Core.Model 
{ 
    [Table("Cust_ProfileTbl")] 
    public partial class Cust_ProfileTbl 
    { 
     [Key] 
     public long bintAccountNo { get; set; } 
    } 
} 

Cust_GroupTbl.cs

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Text; 
using System.Threading.Tasks; 
using System.ComponentModel.DataAnnotations; 
using System.ComponentModel.DataAnnotations.Schema; 
namespace xxxx.Core.Model 
{ 
    [Table("Cust_GroupTbl")] 
    public partial class Cust_GroupTbl 
    { 
     [Key] 
     public int intCustGroup { get; set; } 
    } 
} 

Answer 1

var test = 
from cg in service.DBContext.Cust_GroupTbls 
from c in service.DBContext.Cust_ProfileTbls 
select new { intCustGroup = cg.intCustGroup, bintAccountNo = c.bintAccountNo };