Question

I am working with LINQ and MS SQL using c#. I am facing a problem in fetching records. I have 2 tables as,
Sales
Transactions
Sales primary key is being referred by Transactions table.Data is like,

What I am trying to do is to fetch all the records with amount != 0. In this example, the result should include only Sales2 and Sales3, but not Sales1. Since Sales1 is closed.

I have written a query like,

List<Sales> lstSales = (from ccs in context.Sales
                        join transactions in context.Transactions 
                             on ccs.SALESID equals  transactions.SALESID            
                        where transactions .AMOUNT !=0 
                       select ccs).ToList();

It returns me all the 3 Sales records, because for 1 row against Sales1, amount !=0.

Please guide me to achieve the desired results.

Thanks in advance,
Vijay

Answer 1

Though your query filter out the closed transactions, still you have > 0 transactions in the result so you still get the Sales1 Id.

Try this instead (it should work, though I haven’t tested this);

IEnumerable<int> closedIds = context.Transactions.Where(t => t.Amount == 0).Select(t=> s.SalesId);
List<Sales> sales = context.Sales.Where(s => !closedIds.Contains(s.SalesId));

Another approach is (assuming you have an association between Sales and Transaction in the context);

List<Sales> sales = context.Sales.Where(s => !s.Transactions.Any(t=> t.Amount == 0));