/// <summary>/// 過濾不安全的字符串/// </summary>/// <param name="Str"></param>/// <returns></returns>public static string FilteSQLStr(string Str){  Str = Str.Replace("'", "");  Str = Str.Replace("/"", "");  Str = Str.Replace("&", "&");  Str = Str.Replace("<", "<");  Str = Str.Replace(">", ">");  Str = Str.Replace("delete", "");  Str = Str.Replace("update", "");  Str = Str.Replace("insert", "");  return Str; }

#region 過濾 Sql 語句字符串中的注入腳本/// <summary>/// 過濾 Sql 語句字符串中的注入腳本/// </summary>/// <param name="source">傳入的字符串</param>/// <returns>過濾后的字符串</returns>public static string SqlFilter(string source){ //單引號替換成兩個單引號 source = source.Replace("'", "''"); //半角封號替換為全角封號，防止多語句執行 source = source.Replace(";", "；"); //半角括號替換為全角括號 source = source.Replace("(", "（"); source = source.Replace(")", "）"); ///////////////要用正則表達式替換，防止字母大小寫得情況//////////////////// //去除執行存儲過程的命令關鍵字 source = source.Replace("Exec", ""); source = source.Replace("Execute", ""); //去除系統存儲過程或擴展存儲過程關鍵字 source = source.Replace("xp_", "x p_"); source = source.Replace("sp_", "s p_"); //防止16進制注入 source = source.Replace("0x", "0 x"); return source;}#endregion

/// 過濾SQL字符。/// </summary>/// <param name="str">要過濾SQL字符的字符串。</param>/// <returns>已過濾掉SQL字符的字符串。</returns>public static string ReplaceSQLChar(string str){ if (str == String.Empty)  return String.Empty; str = str.Replace("'", "‘"); str = str.Replace(";", "；"); str = str.Replace(",", ","); str = str.Replace("?", "?"); str = str.Replace("<", "＜"); str = str.Replace(">", "＞"); str = str.Replace("(", "("); str = str.Replace(")", ")"); str = str.Replace("@", "＠"); str = str.Replace("=", "＝"); str = str.Replace("+", "＋"); str = str.Replace("*", "＊"); str = str.Replace("&", "＆"); str = str.Replace("#", "＃"); str = str.Replace("%", "％"); str = str.Replace("$", "￥"); return str;}

/// <summary>/// 過濾標記/// </summary>/// <param name="NoHTML">包括HTML，腳本，數據庫關鍵字，特殊字符的源碼 </param>/// <returns>已經去除標記后的文字</returns>public string NoHtml(string Htmlstring){ if (Htmlstring == null) {  return ""; } else {  //刪除腳本   Htmlstring = Regex.Replace(Htmlstring, @"<script[^>]*?>.*?</script>", "", RegexOptions.IgnoreCase);  //刪除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);  //刪除與數據庫相關的詞  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("*/", "");  Htmlstring = Htmlstring.Replace("/r/n", "");  Htmlstring = HttpContext.Current.Server.HtmlEncode(Htmlstring).Trim();  return Htmlstring; }}

public static bool CheckBadWord(string str){string pattern = @"select|insert|delete|from|count/(|drop table|update|truncate|asc/(|mid/(|char/(|xp_cmdshell|exec master|netlocalgroup administrators|net user|or|and";if (Regex.IsMatch(str, pattern, RegexOptions.IgnoreCase))return true;return false;}public static string Filter(string str){string[] pattern ={ "select", "insert", "delete", "from", "count//(", "drop table", "update", "truncate", "asc//(", "mid//(", "char//(", "xp_cmdshell", "exec master", "netlocalgroup administrators", "net user", "or", "and" };for (int i = 0; i < pattern.Length; i++){str = str.Replace(pattern[i].ToString(), "");}return str;}