C＃和隐藏方法 [英] C# and method hiding

问题描述

每MSDN，用于隐藏方法时，新的关键字只是禁止警告。

Per MSDN, the "new" keyword when used for method hiding only suppresses a warning.

的http：// msdn.microsoft.com/en-us/library/435f1dw2.aspx

我真的需要这个新关键字来执行的方法隐藏？如果我有了同样的方法名称，但没有明确指出这是压倒一切的子类，是不是同样的事情基本上，我只是得到一个警告？请告诉我，如果我的理解是正确的。谢谢

Do I really need this "new" keyword to perform method hiding? If I have a child class that has the same method name but doesn't explicitly state that it is overriding, isn't that the same thing essentially, I just get a warning? Please tell me if my understanding is correct. Thanks

推荐答案

您get方法隐藏无论您是否指定新的，但它是不一样的压倒一切的。在此处，他们是不同的一个例子：

You get method hiding whether or not you specify "new", but it's not the same as overriding. Here's an example where they're different:

using System;

class Base
{
    public virtual void OverrideMe()
    {
        Console.WriteLine("Base.OverrideMe");
    }

    public virtual void HideMe()
    {
        Console.WriteLine("Base.HideMe");
    }
}

class Derived : Base
{
    public override void OverrideMe()
    {
        Console.WriteLine("Derived.OverrideMe");
    }

    public new void HideMe()
    {
        Console.WriteLine("Derived.HideMe");
    }
}

class Test
{
    static void Main()
    {
        Base x = new Derived();
        x.OverrideMe();
        x.HideMe();
    }
}

输出是：

The output is:

Derived.OverrideMe
Base.HideMe

尽管基 HideMe 方法是虚拟的，它不是在覆盖派生，这是只是被隐藏了 - 所以这种方法仍然是绑定到虚拟方法基本，而这正是被执行

Even though the base HideMe method is virtual, it isn't overridden in Derived, it's just hidden - so the method is still bound to the virtual method in Base, and that's what gets executed.

会员一般隐藏是一个坏主意，使得代码更难理解。这是事实可用的是版本而言是有利的，但是 - 这意味着添加一个方法到基类没有可能让派生类重写它无意的，他们可以继续像以前一样工作。这就是为什么你得到警告。

Member hiding is generally a bad idea, making the code harder to understand. The fact that it's available is beneficial in terms of versioning, however - it means adding a method to a base class doesn't potentially let derived classes override it unintentionally, and they can keep working as before. That's why you get the warning.

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