c# - 选择所有类型的员工，然后选择特定员工

Question

这是一种家庭作业，所以有人可以指导我(而不是回答)如何组合这两个 LINQ 查询。这是问题

Update the PayrollSytem by using LINQ to map the List in to a list of anonymous objects in which each object contains an Employee’s name and earning. When a BasePlusCommissionEmployee is encountered, give a 10% base-salary increase without modifying the original BasePlusCommissionEmployee object. Display the names and earnings.

到目前为止我有这个

var model1 = employees.OfType<BasePlusCommissionEmployee>().Select(x => new
    {
        x.FirstName,
        x.LastName,
        Increased_salary=x.BaseSalary*=1.10M
    });

var model = employees.Select(x => new
    {
        x.FirstName,
        x.LastName,
        earning = x.Earnings()
    });

foreach (var item in model)
    {
        Console.WriteLine(item);
    }

类的UML图是

所以查询单独工作正常，但有什么方法可以使它成为一个查询。如果需要任何其他代码，我会提供。

Answer 1

您可以在匿名类中使用三元运算符简单地检查该员工是否为基础加佣金员工。

employees.Select(x => new { 
    FirstName = x.FirstName,
    LastName = x.LastName,
    Salary = x is BasePlusCommissionEmployee ? (x as BasePlusCommissionEmployee).BaseSalary * 1.1M : x.Earnings()
}).ToList();