C# 特殊字符过滤拦截

 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("$", "");
            //删除与数据库相关的词
            str = Regex.Replace(str, "select", "", RegexOptions.IgnoreCase);
            str = Regex.Replace(str, "insert", "", RegexOptions.IgnoreCase);
            str = Regex.Replace(str, "delete from", "", RegexOptions.IgnoreCase);
            str = Regex.Replace(str, "count", "", RegexOptions.IgnoreCase);
            str = Regex.Replace(str, "drop table", "", RegexOptions.IgnoreCase);
            str = Regex.Replace(str, "truncate", "", RegexOptions.IgnoreCase);
            str = Regex.Replace(str, "asc", "", RegexOptions.IgnoreCase);
            str = Regex.Replace(str, "mid", "", RegexOptions.IgnoreCase);
            str = Regex.Replace(str, "char", "", RegexOptions.IgnoreCase);
            str = Regex.Replace(str, "xp_cmdshell", "", RegexOptions.IgnoreCase);
            str = Regex.Replace(str, "exec master", "", RegexOptions.IgnoreCase);
            str = Regex.Replace(str, "net localgroup administrators", "", RegexOptions.IgnoreCase);
            str = Regex.Replace(str, "and", "", RegexOptions.IgnoreCase);
            str = Regex.Replace(str, "net user", "", RegexOptions.IgnoreCase);
            str = Regex.Replace(str, "or", "", RegexOptions.IgnoreCase);
            str = Regex.Replace(str, "net", "", RegexOptions.IgnoreCase);
            str = Regex.Replace(str, "delete", "", RegexOptions.IgnoreCase);
            str = Regex.Replace(str, "drop", "", RegexOptions.IgnoreCase);
            str = Regex.Replace(str, "script", "", RegexOptions.IgnoreCase);
            str = Regex.Replace(str, "update", "", RegexOptions.IgnoreCase);
            str = Regex.Replace(str, "and", "", RegexOptions.IgnoreCase);
            str = Regex.Replace(str, "chr", "", RegexOptions.IgnoreCase);
            str = Regex.Replace(str, "master", "", RegexOptions.IgnoreCase);
            str = Regex.Replace(str, "truncate", "", RegexOptions.IgnoreCase);
            str = Regex.Replace(str, "declare", "", RegexOptions.IgnoreCase);
            str = Regex.Replace(str, "mid", "", RegexOptions.IgnoreCase);
            return str;
        }