Преобразование агрегатный SQL в LINQ эквивалент

Question

Это мой SQL-запрос:

Select 
    Product.ProductName, 
    Sum(Credit) as TotalCredit, 
    Sum(Debit) as TotalDebit 
from 
    Acct_GL 
inner join 
    Product ON Acct_GL.AcctRef = Product.ProductCode 
where 
    AccountId = @custaid 
    and CONVERT(Date, effdate, 103) <= CONVERT(Date, @todate, 103) 
    and (Reverse = 'N') 
group by 
    Product.ProductName 

Это запрос LINQ Я пытаюсь преобразовать:

var TotalAccountBalance = 
    (from pro in _db.Products 
    join gl in _db.Acct_GL on pro.ProductCode.Trim() equals (gl.AcctRef.Trim()) 
    where gl.AccountID == CustId && 
      gl.EffDate <=FromDate && 
      gl.Reverse == "N" 
    group pro by pro.ProductName into pd 
    orderby pd.Key 
    select new AccountBalanceModel() 
       { 
        Total = Convert.ToDecimal(gl.Credit) - Convert.ToDecimal(gl.Debit) 
       }).FirstOrDefault(); 

Answer 1

var TotalAccountBalance = 
(from pro in _db.Products 
      join gl in _db.Acct_GL on pro.ProductCode equals gl.AcctRef 
      where gl.AccountID == CustId && gl.EffDate <= FromDate && gl.Reverse == "N" 
      group pro by pro.ProductName into pd 
      select new AccountBalanceModel() 
      { 
       ProductName = pd.key, 
       Total = (decimal)pd.Sum(x=>x.Credit) - (decimal)pd.Sum(x=>x.Debit) 
      }).ToList();