为什么我会收到警告CS0108有关属性从基类中隐藏方法的警告 [英] Why do I get warning CS0108 about a property hiding a method from a base class

问题描述

鉴于以下类，C#编译器会向我发出此警告:-

Given the following classes the C# compiler gives me this warning:-

CS0108'B.Example'隐藏继承的成员'A.Example(string)'.如果打算隐藏，请使用new关键字".

CS0108 "'B.Example' hides inherited member 'A.Example(string)'. Use the new keyword if hiding was intended".

class A
{
    public string Example(string something)
    {
        return something;
    }
}

class B : A
{
    public string Example => "B";
}

如果使用运行此代码的类

If use the classes running this code

class Program
{
    static void Main(string[] args)
    {
        B b = new B();
        Console.WriteLine(b.Example("A"));
        Console.WriteLine(b.Example);
    }
}

我得到以下输出

A
B

那是我的期望.

在我看来，什么都没有被隐藏.确实如果类B实际上包含像这样的简单方法重载，那么我不会收到任何等效警告.

It doesn't seem to me that anything is being hidden at all. Indeed if class B actually contains a simple method overload like this then I get no equivalent warning.

class B : A
{
    public string Example(int another) => "B";
}

该属性是否有使该编译器警告有效的特殊属性，或者这是编译器中误报的情况?

Is there something special about a property that makes that compiler warning valid or is this a case of a false positive in the compiler?

推荐答案

您的第一个示例类B将具有示例"属性，因此隐藏了方法Example(string)，编译器会要求您指定新的关键字来进行说明您的意图:

Your first example class B will have a Property "Example", thus hiding the method Example(string) and the compiler ask you to specify the new keyword to clarify your intentions:

class B
{
    public string Example;
}

在第二个示例中，Example(string/int)的两个方法实现都将可见.因此，B类实现不会隐藏它:

In your second example both method implementations of Example(string/int) will be visible. So no hiding by the class B implementation:

class B
{
    public string Example(string something);
    public string Example(int another);
}

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