使用Oracle.dataaccess客户端从c＃到Oracle之间的日期

Question

我使用以下查询从Oracle all_objects视图访问数据。从Oracle SQL Developer尝试相同的工作时，它可以正常工作，并且从C＃代码中获取任何数据都不会。

SELECT OBJECT_NAME,OBJECT_TYPE,CREATED,LAST_DDL_TIME
FROM sys.all_objects
where object_type='TABLE'
AND OWNER='SYS'
AND LAST_DDL_TIME between to_date('01/01/2013','DD/MM/YYYY')
  and to_date('01/10/2016','DD/MM/YYYY')

如果我在没有任何过滤器的情况下使用以下查询，它在Oracle和C＃中都可以正常工作......

SELECT OBJECT_NAME,OBJECT_TYPE,CREATED,LAST_DDL_TIME FROM sys.all_objects

知道它为什么不起作用？

以下是getDatSet函数中传递的示例值，日期是从c＃DateTimepicker

中选择的

strFromDate - {2/15/2012 12:00:00 AM} strToDate - {11/15/2016 2:31:48 PM}

        public DataSet GetDataSet(DateTime strFromDate, DateTime strToDate, List<string> strObjects)
    {
        OracleCommand objCmd;
        OracleDataAdapter objDA;
        DataSet objDS;
        string StrSqlObjects = string.Empty; ;

        try
        {
            StrSqlObjects += " SELECT OBJECT_NAME,OBJECT_TYPE,CREATED,LAST_DDL_TIME FROM sys.all_objects where ";
            StrSqlObjects += " LAST_DDL_TIME between to_date(:startdate,'DD/MM/YYYY') and to_date(:enddate,'DD/MM/YYYY')";

            objCmd = new OracleCommand(StrSqlObjects);
            objCmd.Connection = m_Conn;
            objCmd.Parameters.Clear();
            objCmd.Parameters.Add("startdate", strFromDate);
            objCmd.Parameters.Add("enddate",strToDate);

            objDA = new OracleDataAdapter();
            objDA.SelectCommand = objCmd;

            var oracleCommandBindByNameProperty = objCmd.GetType().GetProperty("BindByName");
            oracleCommandBindByNameProperty.SetValue(objCmd, true, null);


            objDS = new DataSet();
            objDS.Tables.Add("AllChange");
            objDA.Fill(objDS, "Allchange");
        }
        catch (System.Exception e)
        {
            System.Diagnostics.Debug.WriteLine("Error GetDataSet " + e.Message);

            throw e;
        }
        finally
        {
            CloseConnection();
        }
        return objDS;
    }