如何处理CS1721的时候我真的需要从两个类继承？ [英] How to deal with CS1721 when I really need to inherit from two classes?

问题描述

在我的C＃code我希望有一个 CustomIdentity 类，它继承 System.MarshalByRefObject 和 System.Security.Principal.GenericIndentity 类。

In my C# code I want a CustomIdentity class that inherits from System.MarshalByRefObject and System.Security.Principal.GenericIndentity classes.

然而，当我尝试写这样的继承C＃将与 CS1721错误说我不能直接从多个类继承。

However when I try to write such inheritance C# would object with CS1721 error saying I can't directly inherit from more than one class.

现在在这种情况下，它是很容易克服这一点 - 我会继承的IIdentity 添加 GenericIdentity 成员变量，重新实现所有的的IIdentity 通过该成员变量的方法。

Now in this case it's quite easy to overcome this - I'll inherit from IIdentity, add GenericIdentity member variable and reimplement all IIdentity methods via that member variable.

但我怎么做的情况下，我想从两个类继承了一套方法，巨大的？

But how would I do in case I wanted to inherit from two classes with a huge set of methods?

推荐答案

您不知道。你不能。

这是不是在C＃或.NET的支持。

That is not supported in C# or .NET.

您使用多个的接口实现的，和最多单（非 - 对象）的继承。在大多数情况下，即使是单继承是已经被滥用; P

You use multiple interface implementation, and at most single (non-object) inheritance. In most cases, even single inheritance is vastly overused ;p

要吸收的方法，你就必须使用某种类型的封装。扩展方法的也的提供方式来分享类型的方法，完整。

To absorb the methods, you'd have to use some kind of encapsulation. Extension methods also provide a way to share methods between types, for completeness.

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