1 using System;
2 using System.Collections.Generic;
3 using System.Linq;
4 using System.Text;
5
6 class Program
7 {
8
9 /// <summary>
10 ///
11 /// </summary>
12 /// <param name="str">待处理的字符串</param>
13 /// <param name="toRep">要替换的字符串中的子串</param>
14 /// <param name="strRep">用来替换toRep字符串的字符串</param>
15 /// <returns>返回一个结果字符串</returns>
16
17 public static string StringReplace(string str, string toRep, string strRep)
18 {
19 StringBuilder sb = new StringBuilder();
20
21 int np = 0, n_ptmp = 0;
22
23 for (; ; )
24 {
25 string str_tmp = str.Substring(np);
26 n_ptmp = str_tmp.IndexOf(toRep);
27
28 if (n_ptmp == -1)
29 {
30 sb.Append(str_tmp);
31 break;
32
33 1. }
34
35 else
36 {
37 sb.Append(str_tmp.Substring(0, n_ptmp)).Append(strRep);
38 np += n_ptmp + toRep.Length;
39 }
40 }
41 return sb.ToString();
42
43 }
44
45
46 /// <summary>
47 /// 测试用例:"dwdawdyesdwjdao dyesj yes dwjaodjawiodayes djwaiodyesjijw"
48 /// </summary>
49 /// <param name="args"></param>
50
51 static void Main(string[] args)
52 {
53 string str = Console.ReadLine();
54 str = StringReplace(str, "yes", "no");
55 Console.WriteLine(str);
56 Console.ReadKey();
57 }
58 }
