什么是阴影?

What is Shadowing?(什么是阴影?)

问题描述

在 C# 中，术语 shadowing 是什么意思?我已阅读 此链接，但没有完全理解.

In C# what does the term shadowing mean? I have read this link but didn't fully understand it.

推荐答案

阴影隐藏了基类中的方法.使用您链接的问题中的示例:

Shadowing hides a method in a base class. Using the example in the question you linked:

class A 
{
   public int Foo(){ return 5;}
   public virtual int Bar(){return 5;}
}
class B : A
{
   public new int Foo() { return 1;}
   public override int Bar() {return 1;}
}

类B 覆盖虚方法Bar.它隐藏(隐藏)非虚拟方法Foo.覆盖使用 override 关键字.使用 new 关键字完成阴影.

Class B overrides the virtual method Bar. It hides (shadows) the non-virtual method Foo. Override uses the override keyword. Shadowing is done with the new keyword.

在上面的代码中，如果你在B类中定义Foo方法时没有使用new关键字，你会得到这个编译器警告:

In the code above, if you didn't use the new keyword when defining the Foo method in class B, you would get this compiler warning:

'test.B.Foo()' hides inherited member 'test.A.Foo()'. Use the new keyword if hiding was intended.

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