LINQ to Entities无法识别方法'Int32 ToInt32

Question

我有这个工作的T-SQL语句，我想将它转换为LINQ。

---------- T-SQL ---------

select o.Type, o.Name, SUM(Price) As Total
from Transactions t
inner join Orders o 
ON t.CustomerID = o.CustomerID
Group By o.Type, o.Name  
Order by o.Name

-----我的尝试-----

from t in db.Transactions
join o in db.Orders on new { CustomerID = t.CustomerID } equals new { CustomerID = Convert.ToInt32(o.CustomerID) }
group o by new {
  o.Type,
  o.Name
} into g
orderby
  g.Key.Name
select new {
  g.Key.Type,
  g.Key.Name,
  Total = (int?)g.Sum(p => p.Price)
}

以上返回此错误：

  

LINQ to Entities无法识别方法'Int32 ToInt32（System.Object）'方法，并且此方法无法转换为商店表达式。

谢谢。