asp.net的sql防注入和去除html标记的方法

// <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 static 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);
Htmlstring = Regex.Replace(Htmlstring, "net user", "", RegexOptions.IgnoreCase);
Htmlstring = Regex.Replace(Htmlstring, "or", "", RegexOptions.IgnoreCase);
Htmlstring = Regex.Replace(Htmlstring, "net", "", RegexOptions.IgnoreCase);
//Htmlstring =  Regex.Replace(Htmlstring,"*", "", RegexOptions.IgnoreCase);
//Htmlstring =  Regex.Replace(Htmlstring,"-", "", RegexOptions.IgnoreCase);
Htmlstring = Regex.Replace(Htmlstring, "delete", "", RegexOptions.IgnoreCase);
Htmlstring = Regex.Replace(Htmlstring, "drop", "", RegexOptions.IgnoreCase);
Htmlstring = Regex.Replace(Htmlstring, "script", "", RegexOptions.IgnoreCase);
//特殊的字符
Htmlstring = Htmlstring.Replace("<", "");
Htmlstring = Htmlstring.Replace(">", "");
Htmlstring = Htmlstring.Replace("*", "");
Htmlstring = Htmlstring.Replace("-", "");
Htmlstring = Htmlstring.Replace("?", "");
Htmlstring = Htmlstring.Replace(",", "");
Htmlstring = Htmlstring.Replace("/", "");
Htmlstring = Htmlstring.Replace(";", "");
Htmlstring = Htmlstring.Replace("*/", "");
Htmlstring = Htmlstring.Replace("\r\n", "");
Htmlstring = HttpContext.Current.Server.HtmlEncode(Htmlstring).Trim();
return Htmlstring;
}
}

private bool ProcessSqlStr(string Str)//判断地址栏特殊字符
{
bool ReturnValue = true;
try
{
if (Str.Trim() != "")
{
//string SqlStr = "and ¦exec ¦insert ¦select ¦delete ¦update ¦count ¦* ¦chr ¦mid ¦master ¦truncate ¦char ¦declare";
string SqlStr = "--¦'¦script¦exec¦iframe¦where¦or¦order¦create¦and¦insert¦select¦delete¦update¦mid¦master¦truncate¦declare";
string[] anySqlStr = SqlStr.Split('¦');
foreach (string ss in anySqlStr)
{
if (Str.ToLower().IndexOf(ss) >= 0)
{
ReturnValue = false;
break;
}
}
}
}
catch
{
ReturnValue = false;
}
return ReturnValue;
}