C#字元串替換方法實作

<a href="http://blog.csdn.net/dengxu11/article/details/6632155">http://blog.csdn.net/dengxu11/article/details/6632155</a>

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

class Program

{

    ///

    /// 待處理的字元串

    /// 要替換的字元串中的子串

    /// 用來替換toRep字元串的字元串

    /// 傳回一個結果字元串

    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();

    }

    /// 測試用例:"dwdawdyesdwjdao dyesj yes dwjaodjawiodayes djwaiodyesjijw"

    static void Main(string[] args)

        string str = "1|2+|3|4|5|";

        Console.WriteLine(str);

        str = StringReplace(str, "|", ",");

        Console.ReadKey();

}