为什么我似乎无法掌握接口？ [英] Why can't I seem to grasp interfaces?

问题描述

有人可以为我揭开界面的神秘面纱，还是给我一些好的例子？我一直在这里和那里看到界面弹出，但我还没有真正接触到界面的好解释或何时使用它们。

Could someone please demystify interfaces for me or point me to some good examples? I keep seeing interfaces popup here and there, but I haven't ever really been exposed to good explanations of interfaces or when to use them.

我说的是接口接口与抽象类的上下文。

I am talking about interfaces in a context of interfaces vs. abstract classes.

推荐答案

接口允许您针对描述而不是类型进行编程，允许您更松散地关联软件的元素。

Interfaces allow you to program against a "description" instead of a type, which allows you to more-loosely associate elements of your software.

这样想：你想与你旁边的立方体中的某人分享数据，所以你拿出闪光棒并复制/粘贴。你走到隔壁，那家伙说那是USB吗？你说是的 - 所有的一切。它与闪光棒的大小无关，也不是制造商 - 重要的是它是USB。

Think of it this way: You want to share data with someone in the cube next to you, so you pull out your flash stick and copy/paste. You walk next door and the guy says "is that USB?" and you say yes - all set. It doesn't matter the size of the flash stick, nor the maker - all that matters is that it's USB.

以同样的方式，界面可以让你发挥你的作用发展。使用另一个类比 - 想象你想要创建一个虚拟绘制汽车的应用程序。你可能有这样的签名：

In the same way, interfaces allow you to generisize your development. Using another analogy - imagine you wanted to create an application that virtually painted cars. You might have a signature like this:

public void Paint(Car car, System.Drawing.Color color)...

这将有效，直到您的客户说现在我想画卡车，所以你可以这样做：

This would work until your client said "now I want to paint trucks" so you could do this:

public void Paint (Vehicle vehicle, System.Drawing.Color color)...

这会扩大你的应用......直到你的客户说现在我想画房子！您从一开始就可以创建一个接口：

this would broaden your app... until your client said "now I want to paint houses!" What you could have done from the very beginning is created an interface:

public interface IPaintable{
   void Paint(System.Drawing.Color color);
}

...并将其传递给您的例程：

...and passed that to your routine:

public void Paint(IPaintable item, System.Drawing.Color color){
   item.Paint(color);
}

希望这是有道理的 - 这是一个非常简单的解释，但希望能够深入人心它的价格。

Hopefully this makes sense - it's a pretty simplistic explanation but hopefully gets to the heart of it.

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