调用oracle返回表的存储过程

oracle

CREATE OR REPLACE PACKAGE N_SUPPLIER_TYPE_APR IS
  TYPE DataTable IS REF CURSOR ;
  PROCEDURE Get_View( dt OUT DataTable );
END N_SUPPLIER_TYPE_APR ;

CREATE OR REPLACE PACKAGE BODY N_SUPPLIER_TYPE_APR IS

PROCEDURE Get_View( dt OUT DataTable )
IS
BEGIN
  OPEN dt FOR
    SELECT * FROM n_supplier_type;
END Get_View;

END N_SUPPLIER_TYPE_APR ;

c#

  protected static string connectionString = "Data Source=oradb;User Id=app;Password=password;";

        public static DataTable RunProcedure(string storedProcName)
        {
            using (OracleConnection connection = new OracleConnection(connectionString))
            {
                connection.Open();

                OracleCommand command = new OracleCommand(storedProcName, connection);
                command.CommandType = CommandType.StoredProcedure;
                command.Parameters.Add("dt", OracleType.Cursor).Direction = ParameterDirection.Output;

                OracleDataAdapter DataAdapter = new OracleDataAdapter(command);

                DataTable dt = new DataTable();
                DataAdapter.Fill(dt);

                connection.Close();
                return dt;               
            }
        }