什么是酷的仿制药，为什么使用它们？ [英] What is cool about generics, why use them?

问题描述

我想我会提供这种垒球给任何人想打出来的公园中。什么是仿制药，什么是仿制药，所以，在这里，我应该如何使用它们的优势是什么？请保持相当基础。谢谢你。

I thought I'd offer this softball to whomever would like to hit it out of the park. What are generics, what are the advantages of generics, why, where, how should I use them? Please, keep it fairly basic. Thanks.

推荐答案

• 允许你写code /使用库方法这是类型安全的，即一个List＆LT;串GT;保证是字符串列表。


• 作为仿制药的结果所使用的编译器可以在code进行编译时检查类型安全，即你试图把一个int到字符串该名单？使用一个ArrayList会导致这是一个不太透明运行时错误。


• 比使用对象，因为它要么避免装箱/拆箱（其中.NET有转换<更快href=\"http://stackoverflow.com/questions/5057267/what-is-the-difference-between-a-reference-type-and-value-type-in-c\">value类型引用类型或反之亦然），或从对象到所需的引用类型铸造。


• 允许你写code这是适用于多种类型的相同的基本行为，即一个字典＆LT;字符串，整数＆GT;使用相同的基础code作为一个字典＆LT;日期时间，双取代;使用泛型，框架团队只需编写一件code的实现与上述优点两个结果了。

• Allows you to write code/use library methods which are type-safe, i.e. a List<string> is guaranteed to be a list of strings.
• As a result of generics being used the compiler can perform compile-time checks on code for type safety, i.e. are you trying to put an int into that list of strings? Using an ArrayList would cause that to be a less transparent runtime error.
• Faster than using objects as it either avoids boxing/unboxing (where .net has to convert value types to reference types or vice-versa) or casting from objects to the required reference type.
• Allows you to write code which is applicable to many types with the same underlying behaviour, i.e. a Dictionary<string, int> uses the same underlying code as a Dictionary<DateTime, double>; using generics, the framework team only had to write one piece of code to achieve both results with the aforementioned advantages too.

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