OS：64位win10。
   VS：2017。
   .NET:4.0。
   Oracle 的dll檔案版本為12.2.0.1。
   經過測試發現，需要將以下檔案拷貝到可執行檔案所在的目錄，或者可執行檔案能找到的目錄下即可：Oracle.DataAccess.dll、oci.dll、oracore12.dll、oraociei12.dll、oraons.dll、OraOps12.dll。
   測試程式碼如下：

        string connectionString = "Data Source=(DESCRIPTION=(ADDRESS_LIST=" +
    "(ADDRESS=(PROTOCOL=TCP)(HOST=host)(PORT=1521)))"
 
 +
    "(CONNECT_DATA=(SERVER=DEDICATED)(SERVICE_NAME=orcl)));" +
    "User Id=user;Password=pwd;Pooling = True;Max Pool Size = 10;Min Pool Size = 10;";

            string queryString = "INSERT INTO GIS_GPS_RY(TERMINALID, LONGITUDE, LATITUDE,GPSTIME) values (:V_TERMINALID, :V_LONGITUDE, :V_LATITUDE,:V_GPSTIME)"
 
;
            using (OracleConnection connection = new OracleConnection(connectionString))
            {
                connection.Open();
                try
                {
                    OracleCommand cmd = connection.CreateCommand();
                    cmd.CommandText = queryString;


                    OracleParameter[] paras =
                    {
                        new OracleParameter { ParameterName = "V_TERMINALID"
 
,Value=utils.GenerateTimeStamp(System.DateTime.Now),OracleDbType = OracleDbType.Varchar2},
                        new OracleParameter { ParameterName = "V_LONGITUDE",Value=utils.GenerateTimeStamp(System.DateTime.Now),OracleDbType = OracleDbType.Varchar2},
                        new OracleParameter { ParameterName = "V_LATITUDE",Value=utils.GenerateTimeStamp(System.DateTime.Now),OracleDbType = OracleDbType.Varchar2},
                        new OracleParameter { ParameterName = "V_GPSTIME",Value=System.DateTime.Now }
                    };

                    if (paras != null)
                    {
                        cmd.Parameters.AddRange(paras);
                    }
                    //System.DateTime.Now.ToString();
                    //cmd.Parameters.Add("V_TERMINALID", OracleDbType.Varchar2, ParameterDirection.Input).Value = utils.GenerateTimeStamp(System.DateTime.Now);
                    //cmd.Parameters.Add("V_LONGITUDE", OracleDbType.Varchar2, ParameterDirection.Input).Value = utils.GenerateTimeStamp(System.DateTime.Now);
                    //cmd.Parameters.Add("V_LATITUDE", OracleDbType.Varchar2, ParameterDirection.Input).Value = utils.GenerateTimeStamp(System.DateTime.Now);
                    //cmd.Parameters.Add("V_GPSTIME", OracleDbType.Date, ParameterDirection.Input).Value = System.DateTime.Now;
                    cmd.ExecuteNonQuery();
                    cmd.Parameters.Clear();
                }
                catch (Exception ex)
                {
                    MessageBox.Show(ex.StackTrace);
                    MessageBox.Show(ex.Message);
                }
                finally
                {
                    connection.Close();
                }
            }

  連線字串後加“Pooling = True;Max Pool Size = 10;Min Pool Size = 1;”這三個引數即可實現應用連線池。
  Pooling：是否啟用連線池，True為啟用
  Max Pool Size：連線池最大連線數
  Min Pool Size：連線池最小連線數