.net中params以前没关注过的一个现象

        private static void PrepareCommand(MySqlCommand cmd, MySqlConnection conn, MySqlTransaction trans, string cmdText, MySqlParameter[] cmdParms)
        {
            if (conn.State != ConnectionState.Open)
                conn.Open();
            cmd.Connection = conn;
            cmd.CommandText = cmdText;
            if (trans != null)
                cmd.Transaction = trans;
            cmd.CommandType = CommandType.Text;//cmdType;
            if (cmdParms != null)
            {
                foreach (MySqlParameter parameter in cmdParms)
                {
                    if ((parameter.Direction == ParameterDirection.InputOutput || parameter.Direction == ParameterDirection.Input) &&
                        (parameter.Value == null))
                    {
                        parameter.Value = DBNull.Value;
                    }
                    cmd.Parameters.Add(parameter);
                }
            }
        }

        static void Main(string[] args)
        {
            Work();
            Console.WriteLine("This is the end of program");
            Console.ReadKey(true);
        }

        private static void Work(params string[] strParam)
        {
            if (strParam == null)
            {
                Console.WriteLine("没有任何参数");
            }
            else {
                Console.WriteLine("参数不为空");
            }
        }