/// <summary> /// 测试数据库连通 /// </summary> public static bool db_connection_test(string str_uid, string str_pwd, string str_serveraddr, string str_port,string str_dbname, ref string strErr) {         string str_conn = string.Format("user id={0};password={1};data source=(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST={2})(PORT={3}))(CONNECT_DATA=(SERVICE_NAME={4})))",str_uid, str_pwd, str_serveraddr, str_port, str_dbname);//连接字符串格式化          OracleConnection Conn = new OracleConnection(str_conn);//定义连接实例         try         {             Conn.Open();//通过自带的方式打开连接，测试连接实例             Conn.Close();             return true;         }         catch (Exception ex)         {             strErr = ex.Message;             return false;         } }