/// <summary> 
    /// 為關鍵詞加上超鏈接 
    /// </summary> 
    /// e.g.:  
    /// string result=GetInnertLink("<a href="http//www.baidu.com" mce_href="http/www.baidu.com">Ningxi</a>Xi過得<span>XI<span>好<a href="http://m.yu-168.cn" mce_href=) 
    /// <param name="htmlcode">要把關鍵詞加上超鏈接的html源文本</param> 
    /// <param name="keyword">將要加上超鏈接的關鍵詞</param> 
    /// <param name="title">將要加上的超鏈接的描文本</param> 
    /// <param name="url">將要加上的超鏈接的url地址</param> 
    /// <param name="target">將要加上的超鏈接的打開方式</param> 
    /// <param name="num">為html文本內的前num個關鍵詞加上超鏈接,0代表全加上超鏈接</param> 
    /// <returns>返回為關鍵詞加上超鏈接后的html文本</returns> 
    public static string GetInnertLink(string htmlcode, string keyword, string title, string url, string target, int num)
    {
        string htmlcodeResult = htmlcode;  //用于保存最新的html文本
        string htmlcodeLower = htmlcodeResult.ToLower();  //用于保存最新的Hmtl文本的小寫，方便不分大小寫找出關鍵詞
        string keywordResult = "";  //用于保存關鍵詞的原來面貌，可能是大寫，或者有大也有小
        int keyIndex = 0;           //關鍵詞所在位置
        int currentIndex = 0;       //每次搜索關鍵詞的開始位置
        int currentNum = 0;         //保存當前加上了多少個有效超鏈接
        int LBracketIndex = 0;      //左尖括號<位置
        int RBracketIndex = 0;      //右尖括號>位置
        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)
                {
                    //不在標簽的屬性內，可以有在標簽開始與結束標志內，或在開始與結束標志外 
                    LBracketIndex = htmlcodeLower.LastIndexOf("<", keyIndex - 1, keyIndex - currentIndex);
                    if (LBracketIndex != -1 && htmlcodeLower.Substring(LBracketIndex + 1, 1) != "/")
                    {
                        //在開始與結束標志內 
                        //關鍵詞在開始標簽與結束標簽內，要再判定是不是a標簽或pre標簽 
                        if (htmlcodeLower.Substring(LBracketIndex + 1, 1) == "a" || htmlcodeLower.Substring(LBracketIndex + 3, 3) == "pre")
                        {
                            //關鍵詞在開始與結束a標簽或pre標簽內，不可加超鏈接，循環再來 
                            currentIndex = keyIndex + keyword.Length;
                        }
                        else
                        {
                            //可以加超鏈接 
                            keywordResult = htmlcodeResult.Substring(keyIndex, keyword.Length);
                            htmlcodeResult = htmlcodeResult.Remove(keyIndex, keyword.Length);
                            htmlcodeResult = htmlcodeResult.Insert(keyIndex, "<a href='" + url + "'  title='" + title + "' target='" + target + "'>" + keywordResult + "</a>");
                            htmlcodeLower = htmlcodeResult.ToLower();
                            currentIndex = htmlcodeResult.IndexOf("</a>", keyIndex) + 4;
                            currentNum += 1;
                        }
                    }
                    else if ((RBracketIndex = htmlcodeLower.LastIndexOf(">", keyIndex - 1, keyIndex - currentIndex)) != -1)
                    {
                        //
                        // 當查找范圍內存在'>'標簽則說明在一個靜態控件中則需要判斷這個控件是否是a標簽
                        //
                        if (htmlcodeLower.Substring(htmlcodeLower.IndexOf('<', currentIndex) + 1, 2) == "/a")
                        {
                            //關鍵詞在a標簽內則不能添加超鏈接
                            currentIndex = keyIndex + keyword.Length;
                        }
                    }
                    else
                    {
                        //在結束標志外,可以加超鏈接 
                        keywordResult = htmlcodeResult.Substring(keyIndex, keyword.Length);
                        htmlcodeResult = htmlcodeResult.Remove(keyIndex, keyword.Length);
                        htmlcodeResult = htmlcodeResult.Insert(keyIndex, "<a href='" + url + "' title='" + title + "' target='" + target + "'>" + keywordResult + "</a>");
                        htmlcodeLower = htmlcodeResult.ToLower();
                        currentIndex = htmlcodeResult.IndexOf("</a>", keyIndex) + 4;
                        currentNum += 1;
                    }
                }
                else
                {
                    //關鍵詞是標簽內的屬性值，不可加超鏈接，循環再來 
                    currentIndex = keyIndex + keyword.Length;
                }
            }
            else
            {
                currentIndex = htmlcodeLower.Length + 1;
            }
        }
        return htmlcodeResult;
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