IOC：AutoFac使用demo

使用autofac 实现依赖注入

1.引用 autofac.dll 和 autofac.configuration.dll

2.新增接口 IDAL

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace AutoFacTest
{
    public interface IDAL
    {

        void select(string msg);

    }
}

2.新增 SqlserverDAL 类和 OracleDAL类，并继承IDAL

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace AutoFacTest
{
   public class SqlServerDAL:IDAL
    {
       public void select(string msg)
       {
           Console.WriteLine("this is sqlserver:"+msg);
       }
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace AutoFacTest
{
   public class OracleDAL:IDAL
    {

       public void select(string msg)
       {
           Console.WriteLine("this is Oracle:" + msg);
       }
    }
}

3.  在程序里直接实现IOC注入

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Autofac;
namespace AutoFacTest
{
    class Program
    {
        static void Main(string[] args)
        {
            //   //直接指定实例类型
            var builder = new ContainerBuilder();
            builder.RegisterType<IDAL>();
            builder.RegisterType<OracleDAL>().As<IDAL>();
            using (var container = builder.Build())
            {
             var manager=container.Resolve<IDAL>();
             manager.select("小xiaoniao");

            }
            Console.ReadLine();

        }
    }
}

4.也可以通过引用Autofac.Configuration.dll 来配置 App.config或Web.config 配置文件注入
如下：

<configuration>
  <configSections>
    <section name="autofac" type="Autofac.Configuration.SectionHandler, Autofac.Configuration"/>
  </configSections>
  <autofac defaultAssembly="AutoFacTest">
    <components>
      <component type="AutoFacTest.OracleDAL, AutoFacTest" service="AutoFacTest.IDAL" />
    </components>
  </autofac>

5. 实现直接注入和通过配置文件注入

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Autofac;
using Autofac.Configuration;
namespace AutoFacTest
{
    class Program
    {
        static void Main(string[] args)
        {
            test1();//直接注入
            test2();//配置文件注入
            Console.ReadLine();
        }
        /// <summary>
        /// 直接注入
        /// </summary>
        private static void test1()
        {
            //   //直接指定实例类型
            var builder = new ContainerBuilder();
            builder.RegisterType<IDAL>();
            builder.RegisterType<OracleDAL>().As<IDAL>();
            using (var container = builder.Build())
            {
                var manager = container.Resolve<IDAL>();
                manager.select("直接注入，小xiaoniao");

}
          
            }

/// <summary>
        /// 配置文件注入
        /// </summary>
        private static void test2()
        {
            //   //直接指定实例类型
            var builder = new ContainerBuilder();
            builder.RegisterType<IDAL>();
            builder.RegisterModule(new ConfigurationSettingsReader("autofac"));
            using (var container = builder.Build())
            {
                var manager = container.Resolve<IDAL>();
                manager.select("配置文件注入，小xiaoniao");

}
           
        }
    }
}

直接注入显示结果：this is Oracle:小xiaoniao

将 builder.RegisterType<OracleDAL>().As<IDAL>(); 改成 builder.RegisterType<SqlserverDAL>().As<IDAL>();   则会显示：this is sqlserver:小xiaoniao

直接注入和配置文件注入显示：
this is Oracle:直接注入,小xiaoniao
this is Oracle:配置文件注入,小xiaoniao

DEMO源码