Convert SQL query to linq

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Hello, please help me with c# linq entity framework. I need to convert the following sql query to linq, entity framework:

SELECT AccNo, SUM(Debit) - SUM(Credit) AS Balance FROM  TrxAffair
WHERE (TrxDate > '2021-01-01') GROUP BY AccNo

What I have tried:

public decimal GetPreviousBalance(DateTime trxDate)
        {
            var items = context.TrxAffairs
           .AsQueryable()
            .Where(i => i.TrxDate < trxDate)
            .GroupBy(o => o.AccNo)
            .Select(s => s.Sum(i=>(i.Debit-i.Credit)));

            OnGetPreviousBalance(items.Sum(s=>s.Value));

            return items.Sum(s => s.Value);
        }

Posted 21-Apr-21 21:08pm

katumbamartin

Updated 22-Apr-21 22:23pm

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Comments

Richard Deeming 22-Apr-21 3:58am

You haven't told us what the problem is with your code.

One obvious question: if you want the total for all records, why are you grouping by AccNo?

diginet0 22-Apr-21 8:37am

He is doing a balance per account, so to do that he has to group by Account number

Richard Deeming 22-Apr-21 9:16am

But he's summing all of the grouped totals. :)

diginet0 22-Apr-21 8:39am

What happen when You tried that code?

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Maciej Los · Answer 1 · 2021-04-22T22:23:00

Well, this:

SQL

SELECT AccNo, SUM(Debit) - SUM(Credit) AS Balance 
FROM  TrxAffair
WHERE (TrxDate > '2021-01-01')
GROUP BY AccNo

is equal to this:

C#

var items = context.TrxAffairs
    .AsQueryable()
    .Where(i => i.TrxDate > trxDate)
    .GroupBy(o => o.AccNo)
    .Select(grp => new {AccNo = grp.Key, Balance = grp.Sum(i=>(i.Debit)) - grp.Sum(i=>(i.Credit)))
    .ToList();