从 List<T> 继承 [英] Inheriting from List&lt;T&gt;

问题描述

实现从List继承的新类的最快方法是什么?

What is the fastest way to implement a new class that inherits from List<T>?

class Animal {}

class Animals : List<Animal> {} // (1)

我遇到的一个问题:通过简单地执行 (1)，我发现我没有从 List 继承任何构造函数的好处代码>.

One problem I've encountered: By simply doing (1), I've found that I'm not getting the benefit of inheriting any constructors from List<T>.

最后，我希望 Animals 的行为很像 List(例如，可以构造，与 Linq 兼容).但除此之外，我还希望能够添加自己的自定义方法.

In the end, I'd like Animals to behave a lot like a List<T> (e.g., can be constructed, compatibility with Linq). But in addition, I'd also like to be able to add my own custom methods.

推荐答案

如果你想创建一个公开暴露的动物集合，你不应该从List继承而是从 Collection 继承并在类名中使用后缀 Collection.示例:AnimalCollection : Collection.

If you want to create a publicly exposed animal collection you should not inherit from List<T> and instead inherit from Collection<T> and use the postfix Collection in the class name. Example: AnimalCollection : Collection<Animal>.

这受到框架设计指南的支持，更具体地说:

不要使用ArrayList、List、Hashtable 或 Dictionary公共 API.使用 Collection，ReadOnlyCollection,KeyedCollection，或取而代之的是 CollectionBase 子类型.笔记泛型集合只是Framework 2.0 版支持及以上.

DO NOT use ArrayList, List<T>, Hashtable, or Dictionary<K,V> in public APIs. Use Collection<T>, ReadOnlyCollection<T>, KeyedCollection<K,T>, or CollectionBase subtypes instead. Note that the generic collections are only supported in the Framework version 2.0 and above.

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