c# - How to write Linq expression using external objects -


i trying convert loop in linq expression. seams not work way doing it:

var customer = getcustomerfromdatabase(id); icollection<order> customerorders = null; if (customer == null) {     logandthrowcustomernotfound(id); } else {     customerorders = customer.orders; }  customer.yeartodatesales = 0.0; customer.currentsales = 0.0; datetime today = datetime.now;  if (customerorders != null)     foreach (var order in customerorders)     {         if (order.submitteddate != null              && order.submitteddate.value.year.compareto(today.year) == 0)         {             customer.yeartodatesales += (double)order.ordertotal;         }          if (order.submitteddate != null              && (order.submitteddate.value.month.compareto(today.month) == 0              && order.submitteddate.value.year.compareto(today.year) == 0))         {             customer.currentsales += (double)order.ordertotal;         }     }

so came expression customer orders match current year... bot not work. in expression order empty , today conflicting. i create datetime today = datetime.now; in parm of expression different errors...

ienumerable<order> corders = customerorders    .where((icollection<order> order , today) =>            order.submitteddate.value.month == today.month);

it's simpler if don't attempt pass today lambda, it'll closed expression anyway;

customer.yeartodatesales = customerorders     .where(x => x.submitteddate != null &&                  x.submitteddate.value.year == today.year)     .sum(x => x.ordertotal);  customer.currentsales = customerorders     .where(x => x.submitteddate != null &&                  x.submitteddate.value.month == today.month &&                 x.submitteddate.value.year  == today.year)     .sum(x => x.ordertotal);

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