}

        int CalculateSalary();

}

多态

下面一段作为讲解的例子：

[VB.NET]

Dim emp As Employee

emp = New Clerk()

Console.WriteLine

("Clerk Salary :{0}", emp.CalculateSalary())

emp = New Manager()

Console.WriteLine

("Manager Salary :{0}", emp.CalculateSalary())

[C#]

Employee emp;

emp=new Clerk();

Console.WriteLine

("Clerk Salary :{0}",emp.CalculateSalary());

emp=new Manager();

Console.WriteLine

("Manager Salary :{0}",emp.CalculateSalary());

在例子中，我们定义了一个Employee类型的变量。父类类型的变量能够指向任何其子类的实例。首先，我们让它指向一个叫做Clerk类的实例，然后，我们再让它指向一个叫做Manager类的实例。依靠子类型，父类型（这里的type Employee）甚至可以正确的调用CalculateSalary()方法。通过inheritance polymorphism和interface polymorphism都可以可以完成上面的动作。

[VB.NET]

Dim emp As IEmployee

emp = New Clerk()

Console.WriteLine

("Clerk Salary :{0}", emp.CalculateSalary())

emp = New Manager()

Console.WriteLine

("Manager Salary :{0}", emp.CalculateSalary())

[C#]

IEmployee emp;

emp=new Clerk();

Console.WriteLine

("Clerk Salary :{0}",emp.CalculateSalary());

emp=new Manager();

Console.WriteLine

("Manager Salary :{0}",emp.CalculateSalary());

总结：

通过这篇文章我们可以了解许多VB.NET和C#的OO（面向对象）特征，在VB.NET和C#语言编程的领域，你必须有了解面向对象语言特征和使用关键字的编程思想。

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