是否有可能延长2班？ [英] Is it possible to extends 2 classes?

问题描述

我有这些类：

public class myClassPage : System.Web.UI.Page
{
    public myClassPage ()
    {

    }
}

public class myClassControl : System.Web.UI.UserControl
{
    public myClassControl ()
    {

    }
}

和我想有一个扩展这些类，像出头另一个类：

and I'd like have another Class that extends these classes, somethings like :

public class myClassData : myClassPage, myClassControl
{
    public myClassData ()
    {

    }
}

这可能吗？或者，我可以做什么？

is it possible? Or what can I do?

推荐答案

在你需要扩展两个类的话，你可能会被提供给了青睐组成继承和其他的答案也提到使用接口。举个例子：

In the case where you need to extend two classes, you might be served to favor composition over inheritance, and to use interfaces as other answers have mentioned. An example:

开始由definining的接口

Start by definining your interfaces

interface IFoo 
{
    void A(); 
}

interface IBar
{
    void B();
}

然后创建实现每个接口的具体类

Then create concrete classes that implement each interface

class Foo : IFoo
{
    public void A()
    {
         // code
    }
}

class Bar : IBar 
{
    public void B()
    {
         // code 
    }
}

最后，在类，你要表现出这两套行为，可以实现。每一个接口，但是撰写的实现与具体类

Finally, in the class you want to exhibit both sets of behaviors, you can implement each interface but compose the implementations with the concrete classes.

public class Baz : IFoo, IBar
{
    IFoo foo = new Foo(); // or inject 
    IBar bar = new Bar(); // or inject

    public void A()
    {
        foo.A();
    }

    public void B()
    {
        bar.B();
    }
}

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