依赖注入容器Unity介绍
Unity是微软团队开发的一个轻量级，可扩展的依赖注入容器，为松散耦合应用程序提供了很好的解决方案，支持构造器注入，属性注入，方法注入。
同样根据控制反转IOC与依赖注入DI中的例子
interface IDal { void save(); } class SqlServerDal : IDal { public void save() { Console.WriteLine("SqlServer save."); } } class OracleDal : IDal { public void save() { Console.WriteLine("Oracle save."); } }
Unity的实现如下：
IUnityContainer container = new UnityContainer(); container.RegisterType<IDal, OracleDal>(); var dal = container.Resolve<IDal>();//这是得到OracleDal的实例。 dal.save();1、创建容器
IUnityContainer container = new UnityContainer();
2、注册映射
a) 代码方式注册映射：
container.RegisterType<IDal, OracleDal>();
b) 通过配置方式注册映射：
RegisterType有以下几个重载方法：
RegisterType<TFrom,TTo>( )
RegisterType<TFrom,TTo>(LifetimeManagerlifetime)
RegisterType<TFrom,TTo>(Stringname)
RegisterType<TFrom,TTo>(Stringname, LifetimeManagerlifetime)
RegisterType<T>(LifetimeManagerlifetime)
RegisterType<T>(Stringname, LifetimeManagerlifetime)
RegisterType(Typefrom, Typeto)
RegisterType(Typefrom, Typeto, Stringname)
RegisterType(Typefrom, Typeto, LifetimeManagerlifetime)
RegisterType(Typefrom, Typeto, Stringname, LifetimeManagerlifetime)
RegisterType(Typet, LifetimeManagerlifetime)
RegisterType(Typet, Stringname, LifetimeManagerlifetime)
RegisterType<TFrom,TTo>( )
RegisterType<TFrom,TTo>(LifetimeManagerlifetime)
RegisterType<TFrom,TTo>(Stringname)
RegisterType<TFrom,TTo>(Stringname, LifetimeManagerlifetime)
RegisterType<T>(LifetimeManagerlifetime)
RegisterType<T>(Stringname, LifetimeManagerlifetime)
RegisterType(Typefrom, Typeto)
RegisterType(Typefrom, Typeto, Stringname)
RegisterType(Typefrom, Typeto, LifetimeManagerlifetime)
RegisterType(Typefrom, Typeto, Stringname, LifetimeManagerlifetime)
RegisterType(Typet, LifetimeManagerlifetime)
RegisterType(Typet, Stringname, LifetimeManagerlifetime)
UnityConfigurationSection section = (UnityConfigurationSection)ConfigurationManager.GetSection("unity");config文件配置如下：<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<configSections>
<section name="unity"
type="Microsoft.Practices.Unity.Configuration.UnityConfigurationSection,
Microsoft.Practices.Unity.Configuration" />
</configSections>
<unity>
<containers>
<container>
<types>
<type
type="UnityDemo.IDal,UnityDemo"
mapTo="UnityDemo.OracleDal,UnityDemo" />
</types>
</container>
</containers>
</unity>
</configuration>
配置方式完整代码：
IUnityContainer container = new UnityContainer();
UnityConfigurationSection section = (UnityConfigurationSection)ConfigurationManager.GetSection("unity");
section.Configure(container);
var dal = container.Resolve<IDal>();//这是得到OracleDal的实例。
dal.save();
3、获取对象实例
var dal = container.Resolve<IDal>();//这是得到OracleDal的实例。
可以通过方法ResolveAll来得到所有注册对象的实例：
<types>
<type
type="UnityDemo.IDal,UnityDemo" name="oracle"
mapTo="UnityDemo.OracleDal,UnityDemo" />
<type
type="UnityDemo.IDal,UnityDemo" name="sqlserver"
mapTo="UnityDemo.SqlServerDal,UnityDemo" />
</types>var dals = container.ResolveAll<IDal>();
foreach(IDal dal in dals)
{
dal.save();
}
结果：
结果：
参考文档：