字符位于字符串中当前位置左侧(Position of character to the left of current position in string)

字符位于字符串中当前位置左侧(Position of character to the left of current position in string)

从字符串中的某个任意位置开始，我需要在我的位置左侧找到一个字符的最近位置。 如果我想要执行此操作的权利，我可以使用.IndexOf，但如何做到左侧，我不确定。

我想到的两种方法只是一个递减循环，从我的位置开始，或者将字符串反向并使用正常的.IndexOf

任何人都有更好的方法来实现这个目标？

From some arbitrary position in a string I need to find the closest position of a character to the left of my position. If I was wanting to perform this operation to the right I could just use .IndexOf, but how to do it to the left I am unsure.

The two ways I came up with were just a decrementing loop starting at my position or, putting the string in reverse and using a normal .IndexOf

Anyone else have any better ways of acheiving this?

最满意答案

关于什么：

yourstring.LastIndexOf("foo", 0, currentPosition)

What about:

yourstring.LastIndexOf("foo", 0, currentPosition)