.NET中的两个方向列表枚举器 [英] Two directional list Enumerator in .NET

问题描述

在我的c#应用程序中，我有一个列表，可以使用枚举器进行导航.它非常适合在列表中前进，但是Enumerator类没有MoveBack方法.

In my c# app, I've got a list that I navigate with an Enumerator. It works great for moving forward through the list, but the Enumerator class doesn't have a MoveBack method.

是否存在具有MoveBack方法的其他类，还是我需要编写自己的类?

Is there different class that has a MoveBack method, or do I need to write my own?

推荐答案

任何使用IEnumerator接口定义的枚举器都必须在定义第一个元素之前开始，并迭代整个集合.简而言之:它们不支持向后遍历.

Any enumerators using the IEnumerator interface by definition must start before the first element and iterate forwards through the collection. In short: they don't support backwards traversal.

如果要向后遍历，则需要编写自己的枚举函数，使您可以从任何位置开始.

If you want backwards traversal you'll need to write your own enumeration functions that allow you start anywhere you want.

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