C#中密封类的扩展方法 [英] Extension methods for sealed class in c#

问题描述

我有这个sealed课，

public sealed class A
{
    public string AName {get;set;}
}

有人可以这样编写扩展方法:

and someone can write an extension method for it like this:

public static class Extensions
{
   public static void ExtensionMethodForA (this A a)
   {
      Console.WriteLine("A's Extension method!");
   }
}

问题是，如何防止这种情况发生?

The question is, how do you prevent that ?

推荐答案

您没有.你不能而且你不想要.

You don't. You can't. And you shouldn't want to.

实例方法始终是扩展方法的首选，因此它不应出现冲突.除此之外，它们仅仅是语法/便利性.不要试图给呼叫者带来不便.

Instance methods are always preferred to extension methods, so it should not present a conflict. Other than that, they are mere syntax / convenience. Stop trying to make life inconvenient for callers.

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