sql--SQL注入过滤

        /// 

        ///SQL注入过滤
        /// 
        /// 要进行过滤的字符串
        /// 如果参数存在不安全字符,则返回true
        public static bool SqlFilter2(string InText)
        {
            string word = "exec|insert|select|delete|update|chr|mid|master|or|truncate|char|declare|join";
            if (InText == null)
                return false;
            foreach (string i in word.Split('|'))
            {
                if ((InText.ToLower().IndexOf(i + " ") > -1) || (InText.ToLower().IndexOf(" " + i) > -1))
                {
                    return true;
                }
            }
            return false;
        }

        /// 

        /// 将指定的str串执行sql关键字过滤并返回
        /// 
        /// 要过滤的字符串
        /// 
        public static string SqlFilter(string str)
        {
            return str.Replace("'", "").Replace("'", "").Replace("--", "").Replace("&","").Replace("/*","").Replace(";","").Replace("%","");
        }

        /// 

        /// 将指定的串列表执行sql关键字过滤并以[,]号分隔返回
        /// </summary>
        /// <param name="strs"></param>
        /// <returns></returns>
        public static string SqlFilters(params string[] strs)
        {
            StringBuilder sb = new StringBuilder();
            foreach (string str in strs)
            {
                sb.Append(SqlFilter(str) + ",");
            }
            if (sb.Length > 0)
                return sb.ToString().TrimEnd(',');
            return "";
        }

        public static bool ProcessSqlStr(string Str)
        {
            bool ReturnValue = false;
            try
            {
                if (Str != "")
                {
                    string SqlStr = "'|insert|select*|and'|or'|insertinto|deletefrom|altertable|update|createtable|createview|dropview|createindex|dropindex|createprocedure|dropprocedure|createtrigger|droptrigger|createschema|dropschema|createdomain|alterdomain|dropdomain|);|select@|declare@|print@|char(|select";
                    string[] anySqlStr = SqlStr.Split('|');
                    foreach (string ss in anySqlStr)
                    {
                        if (Str.IndexOf(ss) >= 0)
                        {
                            ReturnValue = true;
                        }
                    }
                }
            }
            catch
            {
                ReturnValue = true;
            }

            return ReturnValue;
        }

原文：https://blog.csdn.net/weixin_38236891/article/details/90205830