哪个更好?数组、ArrayList 或 List<T>(在性能和速度方面) [英] Which is better? array, ArrayList or List&lt;T&gt; (in terms of performance and speed)

问题描述

我需要快速处理我的页面.要添加的值的计数将是动态的.

I require a fast speed in processing my page. The count of the values to be added will be dynamic.

以上哪一项是首选?有正当理由的支持.

Which one of the above is preferred? Support with a valid reason.

例如:

string str = "a,b,c"; //Count of the number of elements in str is not fixed
string[] arr = str.Split(',');

或者，

ArrayList al = new ArrayList();
al.Add(str.Split(','));

推荐答案

List 通常应该优先于 ArrayList

• 值类型更快，因为它避免了装箱.
• 强类型元素

如果您希望向调用者公开的列表是不可变的，List 和 ArrayList 都支持:

If you want lists you expose to callers to be immutable, this is supported by both List<T> and ArrayList:

List<T>.AsReadOnly()
ArrayList.ReadOnly(ArrayList list);

您的问题是关于在 ArrayList 和 List 之间进行选择，但您的示例显示了一个数组，但两者都不是.

Your question asks about choosing between ArrayList and List<T>, but your example shows an array, which is neither.

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