ArrayList vs Listlt;gt; in C#(ArrayList vs Listlt;gt;在 C# 中)
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 IEnumerable
Cast
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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本文标题为:ArrayList vs List<>在 C# 中


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