c# - Ternary operator in Linq -

var result = payroll in currentmonthpayroll                          select new salarydifference                          {                              previousmonthsalary = previousmonthpayroll.where(t => t.employeeid == payroll.employeeid).firstordefault() == null ?                               default(decimal) : previousmonthpayroll.where(t => t.employeeid == payroll.employeeid).firstordefault().salary,                          }; 

is there way not repeat previousmonthpayroll.where(t => t.employeeid == payroll.employeeid).firstordefault() logic pick salary value?

i tried:

previousmonthpayroll.where(t => t.employeeid == payroll.employeeid)                     .firstordefault().salary ?? default(decimal); 

but, if previousmonthpayroll.where(t => t.employeeid == payroll.employeeid).firstordefault() null, throws exception.

as witnessed of answers, there several ways of doing this, preferred way be:

var result = payroll in currentmonthpayroll              select new salarydifference              {                  previousmonthsalary = previousmonthpayroll                      .where(t => t.employeeid == payroll.employeeid)                      .select(prev => prev.salary)                      .firstordefault()              };