public static string Html2Text(string htmlStr)
{
if (String.IsNullOrEmpty(htmlStr))
{
return "";
}
string regEx_style = "<style[^>]*?>[\\s\\S]*?<\\/style>"; //定義style的正則表達式 
string regEx_script = "<script[^>]*?>[\\s\\S]*?<\\/script>"; //定義script的正則表達式 
string regEx_html = "<[^>]+>"; //定義HTML標簽的正則表達式 
htmlStr = Regex.Replace(htmlStr, regEx_style, "");//刪除css
htmlStr = Regex.Replace(htmlStr, regEx_script, "");//刪除js
htmlStr = Regex.Replace(htmlStr, regEx_html, "");//刪除html標記
htmlStr = Regex.Replace(htmlStr, "\\s*|\t|\r|\n", "");//去除tab、空格、空行
htmlStr = htmlStr.Replace(" ", "");
htmlStr = htmlStr.Replace(""", "");//去除異常的引號" " "
htmlStr = htmlStr.Replace(""", "");
return htmlStr.Trim();
}