我将如何知道何时创建界面？ [英] How will I know when to create an interface?

问题描述

我在开发学习中有一点我觉得我必须更多地了解界面。

我经常阅读关于他们，但它似乎就像我无法掌握它们。

我已经阅读了例子：动物基类，IAnimal接口，例如Walk，Run，GetLegs等 - 但我从来没有在做过某些事情，觉得嘿，我应该在这里使用界面。

我失踪了什么？为什么这么难的概念让我掌握！我只是因为我可能没有意识到一个具体的需要 - 主要是由于一些缺乏认识的方面的事实而被吓倒！这让我觉得我在开发商方面缺少一些顶点的东西！如果任何人有这样的经历，并且有一个突破，我会欣赏一些关于如何理解这个概念的技巧。谢谢。

解决方案

它解决了这个具体问题：

你具有4种不同类型的a，b，c，d。你的代码全部都是这样的：

  a.Process（）; 
 b.Process（）; 
 c.Process（）; 
 d.Process（）; 
  

为什么不让他们实现IP可处理，然后执行

 列表< IProcessable>列表; 
 
 foreach（列表中的IProcessable p）
 p.Process（）; 
  

当你添加50个类，所有这些都做同样的事情

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另一具体问题：

看看System.Linq.Enumerable？它定义了大量的实现IEnumerable的任何类型的扩展方法。因为任何实现IEnumerable的东西基本上都说我以无序的foreach类型模式支持迭代，你可以为任何可枚举类型定义复杂的行为（Count，Max，Where，Select等）。

I'm at a point in my development learning where I feel like I must learn more about interfaces.

I frequently read about them but it just seems like I cannot grasp them.

I've read examples like: Animal base class, with IAnimal interface for things like 'Walk', 'Run', 'GetLegs', etc - but I've never been working on something and felt like "Hey I should use an interface here!"

What am I missing? Why is it such a hard concept for me to grasp! I am just intimidated by the fact that I might not ever realize a concrete need for one - mostly due to some missing aspect of understanding them! It makes me feel like I'm missing something up top in terms of being a developer! If anyone has had an experience like this and had a breakthrough I would appreciate some tips on how to understand this concept. Thank you.

解决方案

it solves this concrete problem:

you have a, b, c, d of 4 different types. all over your code you have something like:

a.Process();
b.Process();
c.Process();
d.Process();

why not have them implement IProcessable, and then do

List<IProcessable> list;

foreach(IProcessable p in list)
    p.Process();

this will scale much better when you add, say, 50 types of classes that all do the same thing.

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Another concrete problem:

Have you ever taken a look at System.Linq.Enumerable? It defines a ton of extension methods that operate on any type that implements IEnumerable. Because anything that implements IEnumerable basically says "I support iteration in a unordered foreach-type pattern", you can define complex behaviors (Count, Max, Where, Select, etc.) for any enumerable type.

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