依赖注入容器Unity的基础知识

在《WCF技术剖析》中使用了Unity依赖注入容器，书中给出了两个使用Unity的方法：

方法一：直接在代码中使用

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.Practices.Unity;
using Microsoft.Practices.Unity.Configuration;
using System.Configuration;

namespace UnityDemo
{
class Program
{
static void Main(string[] args)
{
IUnityContainer container = new UnityContainer();
container.RegisterType<IFoo, Foo1>("foo1");
container.RegisterType<IFoo, Foo2>("foo2");

Console.WriteLine(container.Resolve<IFoo>("foo1").GetType());
Console.WriteLine(container.Resolve<IFoo>("foo2").GetType());

Console.ReadKey(true);
}
}

public interface IFoo
{
}

public class Foo1 : IFoo
{
}

public class Foo2 : IFoo
{
}

}

输出结果为：

UnityDemo.Foo1

UnityDemo.Foo2

方法二：使用配置文件

1、App.Config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 name="foo1" type="UnityDemo.IFoo,UnityDemo" mapTo="UnityDemo.Foo1,UnityDemo"/>
<type name="foo2" type="UnityDemo.IFoo,UnityDemo" mapTo="UnityDemo.Foo2,UnityDemo"/>
</types>
</container>
</containers>
</unity>
</configuration>

2、代码

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.Practices.Unity;
using Microsoft.Practices.Unity.Configuration;
using System.Configuration;

namespace UnityDemo
{
class Program
{
static void Main(string[] args)
{
IUnityContainer container = new UnityContainer();
UnityConfigurationSection unitySection = (UnityConfigurationSection)ConfigurationManager.GetSection("unity");
unitySection.Containers.Default.Configure(container);

Console.WriteLine(container.Resolve<IFoo>("foo1").GetType());
Console.WriteLine(container.Resolve<IFoo>("foo2").GetType());

Console.ReadKey(true);
}
}

public interface IFoo
{
}

public class Foo1 : IFoo
{
}

public class Foo2 : IFoo
{
}

}

输出与方法一相同。