//删除脚本
Htmlstring = Regex.Replace(Htmlstring, @"<script(/s[^>]*?)?>[/s/S]*?</script>", "", RegexOptions.IgnoreCase);
//删除样式
Htmlstring = Regex.Replace(Htmlstring, @"<style>[/s/S]*?</style>", "", RegexOptions.IgnoreCase);
//删除html标签
Htmlstring = Regex.Replace(Htmlstring, @"<(.[^>]*)>", "", RegexOptions.IgnoreCase);