问题描述
C#中的ArrayList和List<>有什么区别?
What is the difference between ArrayList and List<> in C#?
是否只有 List<> 有类型而 ArrayList 没有?
Is it only that List<> has a type while ArrayList doesn't?
推荐答案
是的，差不多.List<T> 是一个泛型类.它支持存储特定类型的值，而不需要与 object 进行转换(当 T 是 ArrayList<中的值类型时，这将产生装箱/拆箱开销/代码>案例).ArrayList 只是存储 object 引用.作为一个泛型集合，List<T> 实现了泛型 IEnumerableCast或 OfType 调用).
Yes, pretty much. List<T> is a generic class. It supports storing values of a specific type without casting to or from object (which would have incurred boxing/unboxing overhead when T is a value type in the ArrayList case). ArrayList simply stores object references. As a generic collection, List<T> implements the generic IEnumerable<T> interface and can be used easily in LINQ (without requiring any Cast or OfType call).
ArrayList 属于 C# 没有泛型的时代.它已被弃用，取而代之的是 List<T>.您不应该在以 .NET >= 2.0 为目标的新代码中使用 ArrayList，除非您必须与使用它的旧 API 交互.
ArrayList belongs to the days that C# didn't have generics. It's deprecated in favor of List<T>. You shouldn't use ArrayList in new code that targets .NET >= 2.0 unless you have to interface with an old API that uses it.
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