1.过滤不安全的字符串
////// 过滤不安全的字符串 /// /// ///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; }
2.过滤 Sql 语句字符串中的注入脚本
#region 过滤 Sql 语句字符串中的注入脚本 ////// 过滤 Sql 语句字符串中的注入脚本 /// /// 传入的字符串 ///过滤后的字符串 public static string SqlFilter(string source) { //单引号替换成两个单引号 source = source.Replace("'", "''"); //半角封号替换为全角封号,防止多语句执行 source = source.Replace(";", ";"); //半角括号替换为全角括号 source = source.Replace("(", "("); source = source.Replace(")", ")"); ///////////////要用正则表达式替换,防止字母大小写得情况//////////////////// //去除执行存储过程的命令关键字 source = source.Replace("Exec", ""); source = source.Replace("Execute", ""); //去除系统存储过程或扩展存储过程关键字 source = source.Replace("xp_", "x p_"); source = source.Replace("sp_", "s p_"); //防止16进制注入 source = source.Replace("0x", "0 x"); return source; } #endregion
3.过滤SQL字符
/// 过滤SQL字符。 /// /// 要过滤SQL字符的字符串。 ///已过滤掉SQL字符的字符串。 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; }
4.过滤标记
////// 过滤标记 /// /// 包括HTML,脚本,数据库关键字,特殊字符的源码 ///已经去除标记后的文字 public string NoHtml(string Htmlstring) { if (Htmlstring == null) { return ""; } else { //删除脚本 Htmlstring = Regex.Replace(Htmlstring, @"", "", 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, @"