C#.net 为关键词加超链接

想了又想，现在终于用c#.net为关键词加超链接了，息动搜索html文本里的关键词，然后自动为关键词加上超链接

/// <summary> /// 为关键词加上超链接 /// </summary> /// e.g.: /// string result=GetInnertLink(htmlcode,"xi","ningxi","http://hi.csdn.net/ningxi_","_blank",0) /// <param name="htmlcode">要把关键词加上超链接的html源文本</param> /// <param name="keyword">将要加上超链接的关键词</param> /// <param name="title">将要加上的超链接的描文本</param> /// <param name="url">将要加上的超链接的url地址</param> /// <param name="target">将要加上的超链接的打开方式</param> /// <param name="num">为html文本内的前num个关键词加上超链接,0代表全加上超链接</param> /// <returns>返回为关键词加上超链接后的html文本</returns> public static string GetInnertLink(string htmlcode, string keyword, string title, string url, string target, int num) { string htmlcodeResult = htmlcode; string htmlcodeLower = htmlcodeResult.ToLower(); string keywordResult = ""; int keyIndex = 0; int currentIndex = 0; int currentNum = 0; int LBracketIndex = 0; int RBracketIndex = 0; if (num == 0) { num = htmlcode.Length; } while (currentIndex <= htmlcodeLower.Length && currentNum < num) { if (htmlcodeLower.IndexOf(keyword.ToLower(), currentIndex) > -1) { keyIndex = htmlcodeLower.IndexOf(keyword.ToLower(), currentIndex); LBracketIndex = keyIndex; do { LBracketIndex = htmlcodeLower.LastIndexOf("<", LBracketIndex - 1, LBracketIndex - currentIndex); } while (LBracketIndex != -1 && htmlcodeLower.Substring(LBracketIndex + 1, 1) == "/"); RBracketIndex = htmlcodeLower.LastIndexOf(">", keyIndex - 1, keyIndex - currentIndex); if (LBracketIndex <= RBracketIndex) { //不在标签的属性内，可以有在标签开始与结束标志内，或在开始与结束标志外 LBracketIndex = htmlcodeLower.LastIndexOf("<", keyIndex - 1); if (LBracketIndex != -1 && htmlcodeLower.Substring(LBracketIndex + 1, 1) != "/") { //在开始与结束标志内 //关键词在开始标签与结束标签内，要再判定是不是a标签或pre标签 if (htmlcodeLower.Substring(LBracketIndex + 1, 1) == "a" || htmlcodeLower.Substring(LBracketIndex + 3, 3) == "pre") { //关键词在开始与结束a标签或pre标签内，不可加超链接，循环再来 currentIndex = keyIndex + keyword.Length; } else { //可以加超链接 keywordResult = htmlcodeResult.Substring(keyIndex, keyword.Length); htmlcodeResult = htmlcodeResult.Remove(keyIndex, keyword.Length); htmlcodeResult = htmlcodeResult.Insert(keyIndex, "<a title=" + title + " href=" + url + " mce_href=" + url + " target=" + target + ">" + keywordResult + "</a>"); htmlcodeLower = htmlcodeResult.ToLower(); currentIndex = htmlcodeResult.IndexOf("</a>", keyIndex) + 4; currentNum += 1; } } else { //在结束标志外,可以加超链接 keywordResult = htmlcodeResult.Substring(keyIndex, keyword.Length); htmlcodeResult = htmlcodeResult.Remove(keyIndex, keyword.Length); htmlcodeResult = htmlcodeResult.Insert(keyIndex, "<a title=" + title + " href=" + url + " mce_href=" + url + " target=" + target + ">" + keywordResult + "</a>"); htmlcodeLower = htmlcodeResult.ToLower(); currentIndex = htmlcodeResult.IndexOf("</a>", keyIndex) + 4; currentNum += 1; } } else { //关键词是标签内的属性值，不可加超链接，循环再来 currentIndex = keyIndex + keyword.Length; } } else { currentIndex = htmlcodeLower.Length + 1; } } return htmlcodeResult; }