问题描述
谁能用一个有效的例子来解释方法隐藏在C#中的实际使用?
Can anyone explain the actual use of method hiding in C# with a valid example ?
如果方法是在派生类中使用 new
关键字定义的,则它不能被覆盖.然后它与创建一个具有不同名称的新方法(基类中提到的方法除外)相同.
If the method is defined using the new
keyword in the derived class, then it cannot be overridden. Then it is the same as creating a fresh method (other than the one mentioned in the base class) with a different name.
使用 new
关键字有什么特别的原因吗?
Is there any specific reason to use the new
keyword?
推荐答案
C#不仅支持方法覆盖,还支持方法隐藏.简单地说,如果一个方法没有覆盖派生方法,它就是隐藏它.必须使用 new 关键字声明隐藏方法.因此,第二个清单中正确的类定义是:
C# not only supports method overriding, but also method hiding. Simply put, if a method is not overriding the derived method, it is hiding it. A hiding method has to be declared using the new keyword. The correct class definition in the second listing is thus:
using System;
namespace Polymorphism
{
class A
{
public void Foo() { Console.WriteLine("A::Foo()"); }
}
class B : A
{
public new void Foo() { Console.WriteLine("B::Foo()"); }
}
class Test
{
static void Main(string[] args)
{
A a;
B b;
a = new A();
b = new B();
a.Foo(); // output --> "A::Foo()"
b.Foo(); // output --> "B::Foo()"
a = new B();
a.Foo(); // output --> "A::Foo()"
}
}
}
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