OCIEnvCreate 失敗,返回程式碼為 -1,但錯誤訊息文字不可用 問題處理如下：

解決方法一：更換連線方式

 config 檔案配置：

<add name="MASTER_DB" connectionString="Provider=MSDAORA;Data Source=jhemr;Password=jhemr;User ID=jhemr;" providerName="System.Data.OleDb"/>

對應的C#程式（需要加入using System.Data.OleDb;）

 public DataSet GetDBDataSet(string
 
 DBType, string cmdtxt)
        {
            DataSet dsOrder = new DataSet();

            ConnectionStringSettings sDB = ConfigurationManager.ConnectionStrings[DBType];
          
            if (sDB.ProviderName == "System.Data.OracleClient")
            {
                DbProviderFactory fDB = DbProviderFactories.GetFactory(sDB.ProviderName);
                
 
#region OracleClient
                using (DbConnection connDB = fDB.CreateConnection())
                {
                    connDB.ConnectionString = sDB.ConnectionString;
                    try
                    {
                        connDB.Open();
                        DbCommand cmdDB 
 
= connDB.CreateCommand();
                        cmdDB.CommandText = cmdtxt;
                        DbDataAdapter da = fDB.CreateDataAdapter();
                        da.SelectCommand = cmdDB;
                        da.Fill(dsOrder);
                        cmdDB.Connection.Close();
                    }
                    catch (Exception ex)
                    {
                        if (connDB.State == ConnectionState.Open)
                            connDB.Close();
                        throw ex;
                    }
                }
                #endregion
            }
            else if (sDB.ProviderName == "System.Data.OleDb")
            {
                string connectionString = sDB.ConnectionString;
                using (OleDbConnection connection = new OleDbConnection(connectionString))
                {
                    try
                    {
                        connection.Open();
                        OleDbCommand command = new OleDbCommand();
                        command.Connection = connection;
                        command.CommandText = cmdtxt;
                        OleDbDataAdapter adapter = new OleDbDataAdapter(command);
                        adapter.Fill(dsOrder, "dsOrder");
                    }
                    catch (Exception ex)
                    {
                        throw ex;
                    }
                    finally
                    {
                        if (connection.State != ConnectionState.Closed)
                        {
                            connection.Close();
                        }
                    }

                }
            }
          
            return dsOrder;
        }