c#中dynamic ExpandoObject的用法

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 System.Dynamic;

namespace WindowsFormsTest
{
    public partial class dynamic类 : Form
    {
        public dynamic类()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            dynamic a = GetData(this.textBox1.Text);

            dynamic o = new ExpandoObject();
            o.Id = a.Id;
            o.Title = a.Title;
            o.Time = DateTime.Now;
            MessageBox.Show(o);
        }

        private static dynamic GetData(string a)
        {
            if (a == "")
            {
                News n = new News();
                n.Id = ;
                n.Title = "测试新闻";
                return n;
            }
            else
            {
                Product p = new Product();
                p.Id = ;
                p.Title = "测试产品";
                return p;
            }
        }
    }
}