方法一：
C# CODEstatic void Main() { string s = "123456789"; SwapChar(ref s, 3, 6); Console.Write(s.ToString()); }
static void SwapChar(ref string s, int i1, int i2) { char temp = s[i1]; char temp1 = s[i2]; s = s.Remove(i1, 1).Insert(i1, temp1.ToString()); s = s.Remove(i2, 1).Insert(i2, temp.ToString()); }
方法二：
C# CODEstatic void Main() { string s = "123456789"; //SwapChar(s, 3, 6); Console.Write(SwapChar(s, 3, 6).ToString()); }
static string SwapChar(string s, int p1, int p2) { if ((p1 == p2) || ((p1 < 0) || (p2 < 0))) return s; if ((p1 >= s.Length) || (p2 >= s.Length)) return s; char[] vChars = s.ToCharArray(); vChars[p1] = (char)(vChars[p2] | (vChars[p2] = vChars[p1]) & 0); return new string(vChars); }
方法三：
C# CODEstatic void Main() { string s = "123456789"; Console.Write(SwapChar(s, 3, 6).ToString()); }
public static string SwapChar(string str, int a, int b) { char[] newStr = str.ToCharArray(); newStr[a] = str[b]; newStr[b] = str[a]; return new string(newStr); }
方法四： C# CODEusing System;using System.Collections.Generic;using System.Text;using System.Text.RegularExpressions;namespace ConsoleApplication1{ class Program { static void Main() { string s = "123456789"; Console.Write(SwapChar(s, 3, 6).ToString()); }
static string SwapChar(string s, int p1, int p2) { if (p1 > p2) ...{ int p = p1; p1 = p2; p2 = p; } return Regex.Replace(s, "^(.{" + p1 + "})(.)(.{" + (p2 - p1 - 1) + "})(.)(.*)$", "$1$4$3$2$5"); } }}