求给文章关键字加链接函数[WEB学习示例]

问题来源于http://topic.csdn.net/u/20091106/22/856d3224-67d1-46ee-807b-17e00385cf57.html?seed=1865148156&r=61014592#r_61014592



using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;



public partial class Default2 : System.Web.UI.Page
{
string nr = "";



protected void Page_Load(object sender, EventArgs e)
{
nr = "我想学习C语言教程，我想看的是C语言视频教程，我喜欢C语言，我想习学<a href='http://www.21shipin.com' target='_blank' title='C语言教程'>C语言教程 </a>，其它什么C语言教程，我都不想看。";
string[] a1 = { "C语言视频教程", "C语言教程", "C语言" };//英文字母区分大小写
string[] a2 = { "a1.html", "a2.html", "a3.html" };
for (int Th = 0; Th < a1.Length; Th++)
{ TiHuan(nr, a1, a2); }
}

protected string TiHuan(string Nr, string Gjz, string Wz)
{
string[] NeiRong = new string[1];
string ZuHeNeiRong = "", TiHuan = "<a href='" + Wz + "' target='_blank' title='" + Gjz + "'>" + Gjz + "</a>";
int ChanDu = 0;

NeiRong = Nr.Split('<');//首先分割出

for (int ii = 0; ii < NeiRong.Length; ii++)
{
if (NeiRong[ii].IndexOf("a ") >= 0 || NeiRong[ii].IndexOf("A ") >= 0)// || NeiRong[ii].IndexOf("/a") >= 0 || NeiRong[ii].IndexOf("/A") >= 0
{
ZuHeNeiRong += "<" + NeiRong[ii];//补齐字符
}
else//过滤掉包含指定字符串的内容得到不包含超链接的内容
{
ChanDu = 0;//初始化
for (int cl = 0; cl < NeiRong[ii].Length / Gjz.Length; cl++)
{
if (NeiRong[ii].Substring(ChanDu, NeiRong[ii].Length - ChanDu).IndexOf(Gjz) >= 0)//如果找到关键字
{
if (NeiRong[ii].IndexOf("/a") >= 0 || NeiRong[ii].IndexOf("/A") >= 0)
{ ZuHeNeiRong += "<"; }//补齐字符

ZuHeNeiRong += NeiRong[ii].Replace(Gjz, TiHuan); //替换

ChanDu = NeiRong[ii].IndexOf(Gjz) + Gjz.Length;//继续往后寻找
}
else
{
if (ChanDu == 0)
{
if (NeiRong[ii].IndexOf("/a") >= 0 || NeiRong[ii].IndexOf("/A") >= 0)
{ ZuHeNeiRong += "<"; }//补齐字符

ZuHeNeiRong += NeiRong[ii]; break;
}
}

}
}
}
Label1.Text = ZuHeNeiRong;
nr = ZuHeNeiRong;//替换后的内容返回再次替换
return ZuHeNeiRong;
}

}