我踩着通过对象的大名单做一些东西就表示，在列表中的对象。

I am stepping through a large list of object to do some stuff regarding said objects in the list.

在我的反复，我将从列表中删除某些对象根据一定的标准。

During my iteration, I will remove some objects from the list depending on certain criteria.

在全部完成后，我需要更新关于我的列表中的对象数量的用户界面。 （T列表）。

Once all is done, I need to update the UI regarding the number of objects in my list. (List of T).

问：

当我打电话list.count，并实际.NET遍历列表   算呢，还是它的计数存储为一个属性/变量？

When I call list.count, does .net actually iterate through the list to count it, or does it store the count as a property/variable?

如果.NET身体重新遍历列表，我可能只是以及继续我自己的迭代通过列表中的一个计数器，并保存开销？

If .net physically re-iterates through the list, I may just as well keep a counter on my own iteration through the list, and save the overhead?

感谢

推荐答案

它只是保持一个内部INT跟踪的项目数。因此，没有重复。 该文件说，检索次数是O（1）操作：

It simply keeps an internal int to track the number of items. So no iteration. The documentation says retrieving Count is an O(1) operation:

http://msdn.microsoft.com/en-us/library/27b47ht3%28v=vs.110%29.aspx

您自己可以看到：

http://referencesource.microsoft.com/#mscorlib/system/collections/generic/list.cs