c# 过滤html

  public static string StripHTML(string html)
        {
            try
            {
                System.Text.RegularExpressions.Regex regex1 = new System.Text.RegularExpressions.Regex(@"<script[\s\S]+</script *>", System.Text.RegularExpressions.RegexOptions.IgnoreCase);
                System.Text.RegularExpressions.Regex regex2 = new System.Text.RegularExpressions.Regex(@" href *= *[\s\S]*script *:", System.Text.RegularExpressions.RegexOptions.IgnoreCase);
                System.Text.RegularExpressions.Regex regex3 = new System.Text.RegularExpressions.Regex(@" on[\s\S]*=", System.Text.RegularExpressions.RegexOptions.IgnoreCase);
                System.Text.RegularExpressions.Regex regex4 = new System.Text.RegularExpressions.Regex(@"<iframe[\s\S]+</iframe *>", System.Text.RegularExpressions.RegexOptions.IgnoreCase);
                System.Text.RegularExpressions.Regex regex5 = new System.Text.RegularExpressions.Regex(@"<frameset[\s\S]+</frameset *>", System.Text.RegularExpressions.RegexOptions.IgnoreCase);
                System.Text.RegularExpressions.Regex regex6 = new System.Text.RegularExpressions.Regex(@"\<img[^\>]+\>", System.Text.RegularExpressions.RegexOptions.IgnoreCase);
                System.Text.RegularExpressions.Regex regex7 = new System.Text.RegularExpressions.Regex(@"</p>", System.Text.RegularExpressions.RegexOptions.IgnoreCase);
                System.Text.RegularExpressions.Regex regex8 = new System.Text.RegularExpressions.Regex(@"<p>", System.Text.RegularExpressions.RegexOptions.IgnoreCase);

                html = regex1.Replace(html, ""); //过滤<script></script>标记
                html = regex2.Replace(html, ""); //过滤href=javascript: (<A>) 属性
                html = regex3.Replace(html, " _disibledevent="); //过滤其它控件的on事件
                html = regex4.Replace(html, ""); //过滤iframe
                html = regex5.Replace(html, ""); //过滤frameset
                html = regex6.Replace(html, ""); //过滤frameset
                html = regex7.Replace(html, ""); //过滤frameset
                html = regex8.Replace(html, ""); //过滤frameset
                html = html.Replace(" ", "");
                html = html.Replace("</strong>", "");
                html = html.Replace("<strong>", "");
                html = html.Replace("\r", "");
                html = html.Replace("\n", "");
                html = html.Replace("'", "");
                html = html.Replace("\"", "");
                html = html.Replace("\t", "");
                return html;
            }
            catch
            {
                //MessageBox.Show("Error");
                return html;
            }
        }