C#字符串替换方法实现

http://blog.csdn.net/dengxu11/article/details/6632155

 

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
class Program
{
    ///
    ///
    ///
    /// 待处理的字符串
    /// 要替换的字符串中的子串
    /// 用来替换toRep字符串的字符串
    /// 返回一个结果字符串
    public static string StringReplace(string str, string toRep, string strRep)
    {
        StringBuilder sb = new StringBuilder();
        int subIndex = 0, indexStrRep = 0;
        for (; ; )
        {
            /* The string which will be replace delimiter */
            string str_tmp = str.Substring(subIndex);
            /*  Get the first index of string which will be occurrence. */
            indexStrRep = str_tmp.IndexOf(toRep);
            /*  Equas no character to replace*/
            if (indexStrRep == -1)
            {
                sb.Append(str_tmp);
                break;
            }
            else
            {
                /* insert the sub string to SB */
                sb.Append(str_tmp.Substring(0, indexStrRep));
                if (subIndex != str.Length - 2)
                {
                    /* insert the delimiter "strRep" to SB */
                    sb.Append(strRep);
                }
                subIndex += indexStrRep + toRep.Length;
            }
        }
        return sb.ToString();
    }

    ///
    /// 测试用例:"dwdawdyesdwjdao dyesj yes dwjaodjawiodayes djwaiodyesjijw"
    ///
    ///
    static void Main(string[] args)
    {
        string str = "1|2+|3|4|5|";
        Console.WriteLine(str);
        str = StringReplace(str, "|", ",");
        Console.WriteLine(str);
        Console.ReadKey();
    }
}