字符串列表和ArrayList有什么区别. [英] What is the difference between List of string and ArrayList.

问题描述

List< string>有什么区别?和ArrayList.

解决方案

我想的不多-因为这里没有装箱/拆箱.
实施列表< t>可能仍会在性能上表现更好，因为不需要在运行时进行任何类型检查.

关于该主题的另外两个有趣的读物-
http://blogs.msdn.com/b/joshwil/archive/2004/04/13/112598.aspx [ ^ ]
http://blog.drorhelper.com/2008/10/why-should-i-use-list-and-not-arraylist.html [ Google想出了什么. [ ^ ]

通用List效率更高，因为它仅处理指定的对象类型. ArrayList需要装箱，因为它在单个列表中支持多种类型.最好总是使用List而不是ArrayList.

What is the difference between List<string> and ArrayList. Is there any performance issue?

解决方案

Not much I would think - since there is no boxing / unboxing here.
Implementing List<t> might just still come out better in terms of performance because there is no need to do any type checking at runtime.

Two more interesting reads on this topic -
http://blogs.msdn.com/b/joshwil/archive/2004/04/13/112598.aspx[^]
http://blog.drorhelper.com/2008/10/why-should-i-use-list-and-not-arraylist.html[^]

The difference is that you perform boxing/unboxing (casting the string to object and vice verca) with ArrayList, and generic List<string> allows you to avoid it. Performance of generic classes is better.

And that''s what Google came up with.[^]

A generic List is more efficient because it deals with just the specified object type. An ArrayList requires boxing because it supports multiple types in a single list. It''s almost always better to use a List rather than an ArrayList.

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