感觉override关键字没啥用，有没有都一样重载，以MSDN上的一个例子
using System;
class TestOverride
{
public class Employee
{
public string name;
// Basepay is defined as protected, so that it may be
// accessed only by this class and derrived classes.
protected decimal basepay;
// Constructor to set the name and basepay values.
public Employee(string name, decimal basepay)
{
this.name = name;
this.basepay = basepay;
}
// Declared virtual so it can be overridden.
public virtual decimal CalculatePay()
{
return basepay;
}
}
// Derive a new class from Employee.
public class SalesEmployee : Employee
{
// New field that will affect the base pay.
private decimal salesbonus;
// The constructor calls the base-class version, and
// initializes the salesbonus field.
public SalesEmployee(string name, decimal basepay,
decimal salesbonus) : base(name, basepay)
{
this.salesbonus = salesbonus;
}
// Override the CalculatePay method
// to take bonus into account.
public override decimal CalculatePay()
{
return basepay + salesbonus;
}
}
static void Main()
{
// Create some new employees.
SalesEmployee employee1 = new SalesEmployee("Alice",
1000, 500);
Employee employee2 = new Employee("Bob", 1200);
Console.WriteLine("Employee " + employee1.name +
" earned: " + employee1.CalculatePay());
Console.WriteLine("Employee " + employee2.name +
" earned: " + employee2.CalculatePay());
}
}
运行结果是
Employee Alice earned: 1500
Employee Bob earned: 1200
如果，我把例子中CalculatePay函数前的override关键字都去掉
结果一样
说明在类SalesEmployee中已经重载了CalculatePay，那还要override做什么呢？
