C＃是有理由使用ArrayList而不是List <T> 了吗？

Question

The title pretty much sums it up. Now that we have List<T> 's why would anyone want to use an ArrayList instead? The only reason I can think of is if you are forced to use an old version of .NET before List<T> was implemented?

Answer 1

As you said, if for some reason you are stuck with .Net 1.1 then you don't have a choice.

Your question seems to indicate that there is a choice. So then there is no reason to user ArrayList . Anything that ArrayList can do, List<T> can do as well, if not better.

Answer 2

Short answer, no. ArrayList was from when .NET didn't support generics. List is the more flexible (generic) way to handle lists. In fact, I don't think Silverlight even supports ArrayLists at all.

Answer 3

ArrayList is mostly for backward compatibility. In a project when there is a deadline, you may have the time to convert everything from ArrayList to generic List.

Another reason is that you may be using a library that is written in .NET 1.1. So you may force to use ArrayList in your code, and most likely convert it to a generic List for easy coding.

However, there are some differences and you may want to read this: .NET: ArrayList vs List

Answer 4

You said it yourself: backwards compatibility. There's no use for it any more, but it clearly can't be removed from the BCL as it'd break existing code that for whatever reason must be compiled against .NET 1.1.

Answer 5

我唯一一次使用过ArrayList，因为.Net 2.0与vb.net中内置的My.Settings功能一起使用，而且我已经知道我可能会在那里找到一个通用列表。