c# – Linq的三元 *** 作符

概述var result = from payroll in currentMonthPayroll select new SalaryDifference { PreviousMonthSalary = previousMonthPayroll

var result = from 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,};

有没有办法不重复prevIoUsMonthPayroll.Where(t => t.EmployeeID == payroll.EmployeeID).FirstOrDefault()逻辑来选择薪资值？

我试过了：

prevIoUsMonthPayroll.Where(t => t.EmployeeID == payroll.EmployeeID)                    .FirstOrDefault().Salary ?? default(decimal);

但是,如果prevIoUsMonthPayroll.Where(t => t.EmployeeID == payroll.EmployeeID).FirstOrDefault()为null,则抛出异常.

解决方法 正如所有答案所见,有几种方法可以做到这一点,我的首选方式是：

var result = from payroll in currentMonthPayroll             select new SalaryDifference             {                 PrevIoUsMonthSalary = prevIoUsMonthPayroll                     .Where(t => t.EmployeeID == payroll.EmployeeID)                     .Select(prev => prev.Salary)                     .FirstOrDefault()             };

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