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[ASP.net教程].net 过滤特殊字符


/// <summary>
/// 过滤标记
/// </summary>
/// <param name="NoHTML">包括HTML,脚本,数据库关键字,特殊字符的源码 </param>
/// <returns>已经去除标记后的文字</returns>
public string NoHTML(string Htmlstring)
{
  if (Htmlstring == null)
  {
    return "";
  }
  else
  {
    //删除脚本
    Htmlstring = Regex.Replace(Htmlstring, @"<script[^>]*?>.*?</script>", "", RegexOptions.IgnoreCase);
    //删除HTML
    Htmlstring = Regex.Replace(Htmlstring, @"<(.[^>]*)>", "", RegexOptions.IgnoreCase);
    Htmlstring = Regex.Replace(Htmlstring, @"([/r/n])[/s]+", "", RegexOptions.IgnoreCase);
    Htmlstring = Regex.Replace(Htmlstring, @"-->", "", RegexOptions.IgnoreCase);
    Htmlstring = Regex.Replace(Htmlstring, @"<!--.*", "", RegexOptions.IgnoreCase);

    Htmlstring = Regex.Replace(Htmlstring, @"&(quot|#34);", "\"", RegexOptions.IgnoreCase);
    Htmlstring = Regex.Replace(Htmlstring, @"&(amp|#38);", "&", RegexOptions.IgnoreCase);
    Htmlstring = Regex.Replace(Htmlstring, @"&(lt|#60);", "<", RegexOptions.IgnoreCase);
    Htmlstring = Regex.Replace(Htmlstring, @"&(gt|#62);", ">", RegexOptions.IgnoreCase);
    Htmlstring = Regex.Replace(Htmlstring, @"&(nbsp|#160);", " ", RegexOptions.IgnoreCase);
    Htmlstring = Regex.Replace(Htmlstring, @"&(iexcl|#161);", "/xa1", RegexOptions.IgnoreCase);
    Htmlstring = Regex.Replace(Htmlstring, @"&(cent|#162);", "/xa2", RegexOptions.IgnoreCase);
    Htmlstring = Regex.Replace(Htmlstring, @"&(pound|#163);", "/xa3", RegexOptions.IgnoreCase);
    Htmlstring = Regex.Replace(Htmlstring, @"&(copy|#169);", "/xa9", RegexOptions.IgnoreCase);
    Htmlstring = Regex.Replace(Htmlstring, @"&#(/d+);", "", RegexOptions.IgnoreCase);
    Htmlstring = Regex.Replace(Htmlstring, "xp_cmdshell", "", RegexOptions.IgnoreCase);

    //删除与数据库相关的词
    Htmlstring = Regex.Replace(Htmlstring, "select", "", RegexOptions.IgnoreCase);
    Htmlstring = Regex.Replace(Htmlstring, "insert", "", RegexOptions.IgnoreCase);
    Htmlstring = Regex.Replace(Htmlstring, "delete from", "", RegexOptions.IgnoreCase);
    Htmlstring = Regex.Replace(Htmlstring, "count''", "", RegexOptions.IgnoreCase);
    Htmlstring = Regex.Replace(Htmlstring, "drop table", "", RegexOptions.IgnoreCase);
    Htmlstring = Regex.Replace(Htmlstring, "truncate", "", RegexOptions.IgnoreCase);
    Htmlstring = Regex.Replace(Htmlstring, "asc", "", RegexOptions.IgnoreCase);
    Htmlstring = Regex.Replace(Htmlstring, "mid", "", RegexOptions.IgnoreCase);
    Htmlstring = Regex.Replace(Htmlstring, "char", "", RegexOptions.IgnoreCase);
    Htmlstring = Regex.Replace(Htmlstring, "xp_cmdshell", "", RegexOptions.IgnoreCase);
    Htmlstring = Regex.Replace(Htmlstring, "exec master", "", RegexOptions.IgnoreCase);
    Htmlstring = Regex.Replace(Htmlstring, "net localgroup administrators", "", RegexOptions.IgnoreCase);
    Htmlstring = Regex.Replace(Htmlstring, "and", "", RegexOptions.IgnoreCase);

    return Htmlstring;

  }

}