Question

how can I read the query variable outside the if scope and use it further.

If (IsPaymentList)
{
            var query = paymentList.GroupBy(
            grp => (grp.GrouByField),
            (GrouByField, paymentListgroup) => new
            {
                Key = GrouByField,
                receiptAmount = paymentListgroup.Sum(fields => fields.PaymentAmount),
                creditAccountnumber = paymentListgroup.Max(fields => fields.CreditAccountNumber),
                bankAccountName = paymentListgroup.Max(fields => fields.AccountName),
                bankName = paymentListgroup.Max(fields => fields.BankName),
                payCurrency = paymentListgroup.Max(fields => fields.PaymentCurrencyID),
                partnerServiceID = paymentListgroup.Max(fields => fields.PartnerServiceID),

            });
}

Somebody please share your experience.
Thanks

Answer 1

You can declare the query variable as of type
IQueryable<IGrouping<typeOfKey,typeOfSelect>> query = null;
outside the if and set it to null where the typeOfKey is the type of the grp.GrouByField property. Instead of selecting an anonymous type you have to create a new class that has the properties as needed like this:

public class NewClass
{
     public int Key {get;set;}
     public decimal ReceiptAmount {get;set;}
     //add all the properties here

     public NewClass(string key,decimal recieptAmount)
     {
          //and add constructor for all the needed properties
     }
}

After you create the class set the query to the generic type

//i used int for your grp.GrouByField type
IQueryable<IGrouping<int,NewClass>> query = null;
if(IsPaymentList)
{
    query = paymentList.GroupBy(
            grp => (grp.GrouByField),
            (GrouByField, paymentListgroup) => 
            new NewClass(GrouByField, 
            paymentListgroup.Sum(fields => fields.PaymentAmount), 
            paymentListgroup.Max(fields => fields.CreditAccountNumber), 
            paymentListgroup.Max(fields => fields.AccountName), 
            paymentListgroup.Max(fields => fields.BankName), 
            paymentListgroup.Max(fields => fields.PaymentCurrencyID), 
            paymentListgroup.Max(fields => fields.PartnerServiceID)));
}