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");
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