private string FilterHTML(string html)
{
System.Text.RegularExpressions.Regex regex1 =
new System.Text.RegularExpressions.Regex(@"<script[sS]+</script *>",
System.Text.RegularExpressions.RegexOptions.IgnoreCase);
System.Text.RegularExpressions.Regex regex2 =
new System.Text.RegularExpressions.Regex(@" href *= *[sS]*script *:",
System.Text.RegularExpressions.RegexOptions.IgnoreCase);
System.Text.RegularExpressions.Regex regex3 =
new System.Text.RegularExpressions.Regex(@" no[sS]*=",
System.Text.RegularExpressions.RegexOptions.IgnoreCase);
System.Text.RegularExpressions.Regex regex4 =
new System.Text.RegularExpressions.Regex(@"<iframe[sS]+</iframe *>",
System.Text.RegularExpressions.RegexOptions.IgnoreCase);
System.Text.RegularExpressions.Regex regex5 =
new System.Text.RegularExpressions.Regex(@"<frameset[sS]+</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);
System.Text.RegularExpressions.Regex regex9 =
new System.Text.RegularExpressions.Regex(@"<[^>]*>",
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 = regex9.Replace(html, "");
//html = html.Replace(" ", "");
html = html.Replace("</strong>", "");
html = html.Replace("<strong>", "");
html = Regex.Replace(html, "[\f\n\r\t\v]", ""); //过滤回车换行制表符
return html;
}