static public string ReverseString(string s) {int length = s.Length;string str = "";for (int i = length - 1; i >= 0; i--) {str += s[i];}return str;}
public class Solution {public string ReverseString(string s) {char[] cArr = s.ToCharArray();int length = cArr.Length;int hLength = length / 2;char c;for (int i = 0; i < hLength; i++) {c = cArr[i];cArr[i] = cArr[length - i - 1];cArr[length - i - 1] = c;}return new string(cArr);}}
原文：http://www.cnblogs.com/xiejunzhao/p/5485be32210856e2cd1ac3a89a449cbc.html