Code
namespace Dao
{
    public interface IPersonDao
    {
        void Save();
    }

    public class PersonDao : IPersonDao
    {
        public void Save()
        {
            Console.WriteLine("保存 Person");
        }
    }
}

namespace SpringNetIoC
{
    class Program
    {
        private static void NormalMethod()
        {
            IPersonDao dao = new PersonDao();
            dao.Save();
            Console.WriteLine("我是一般方法");
        }
    }
}

namespace DaoFactory
{
    public static class DataAccess
    {
        public static IPersonDao CreatePersonDao()
        {
            return new PersonDao();
        }
    }
}

FactoryMethod
namespace SpringNetIoC
{
    class Program
    {        private static void FactoryMethod()
        {
            IPersonDao dao = DataAccess.CreatePersonDao();
            dao.Save();
            Console.WriteLine("我是工厂方法");
        }
    }
}

App.config
<?xml version="1.0" encoding="utf-8" ?>
<configuration>

<configSections>
    <sectionGroup name="spring">
      <section name="context" type="Spring.Context.Support.ContextHandler, Spring.Core" />
      <section name="objects" type="Spring.Context.Support.DefaultSectionHandler, Spring.Core" />
    </sectionGroup>
  </configSections>

<spring>

<context>
      <resource uri="config://spring/objects" />
    </context>

<objects xmlns="http://www.springframework.net">
      <description>一个简单的控制反转例子</description>

<object id="PersonDao" type="Dao.PersonDao, Dao" />

</objects>

</spring>

</configuration>

Program
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Dao;
using DaoFactory;
using Spring.Context;
using Spring.Context.Support;

namespace SpringNetIoC
{
    class Program
    {
        static void Main(string[] args)
        {
            //NormalMethod();  // 一般方法
            //FactoryMethod();  // 工厂方法
            IoCMethod();  // IoC方法"

Console.ReadLine();
        }

private static void NormalMethod()
        {
            IPersonDao dao = new PersonDao();
            dao.Save();
            Console.WriteLine("我是一般方法");
        }

private static void FactoryMethod()
        {
            IPersonDao dao = DataAccess.CreatePersonDao();
            dao.Save();
            Console.WriteLine("我是工厂方法");
        }

private static void IoCMethod()
        {
            IApplicationContext ctx = ContextRegistry.GetContext();
            IPersonDao dao = ctx.GetObject("PersonDao") as IPersonDao;
            if (dao != null)
            {
                dao.Save();
                Console.WriteLine("我是IoC方法");
            }
        }
    }
}