int i = 0;
Type t = i.GetType();
PropertyInfo[] props = t.GetProperties();//public属性集合
MethodInfo[] methods = t.GetMethods();//public方法集合

------解决方案--------------------
C# code
using System;
using System.Data;
using System.Drawing;
using System.Windows.Forms;
using System.Reflection;

namespace WindowsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            object o = Activator.CreateInstance(Type.GetType("WindowsApplication13.MyClass"));

            MethodInfo MyMethod = o.GetType().GetMethod("Test");
            object[] obj = new object[2];
            obj[0] = "ZengHD";
            MyMethod.Invoke(o, obj);
            MessageBox.Show(obj[1].ToString());
        }
    }

    public class MyClass
    {
        public void Test(string s,out string value)
        {
            value = "bbbbbbbbbbbbbbbbbbbbbb";
            MessageBox.Show(s);
        }
    }
}