由于单位oracle数据库字符集的原因，无论用oracleclient还是odp.net都使得汉字乱码。无奈尝试oledb方式进行连接，居然正常显示了。哎，浪费好多时间，留念！

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using Oracle.DataAccess.Client;
using Oracle.DataAccess.Types;

using System.Data.OleDb;

namespace test
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            OleDbConnection con=new OleDbConnection("Provider=OraOLEDB.Oracle.1;User ID=tmp;password=tmp;Data Source=tmp;Persist Security Info=True;Extended Properties='PLSQLRSet=1'");

            OleDbCommand store = new OleDbCommand();
            store.Parameters.Clear();
            store.Connection = con;

            store.CommandType = CommandType.StoredProcedure;
            store.CommandText = "work.posstatus";

            try
            {
                OleDbDataAdapter da = new OleDbDataAdapter(store);

                DataTable dt = new DataTable();
                con.Open();
                da.Fill(dt);
                dataGridView1.DataSource=dt;
            }

            finally
            {
                con.Close();
            }
        }
    }
}