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

namespace UnityIocTest
{
 /// <summary>
 /// Unity IOC单例模式 
 /// </summary>
 public class UnitySingleton
 {
  //单例
  private static UnitySingleton instance;

  //ioc容器
  public IUnityContainer container;

  //获取单例
  public static UnitySingleton getInstance()
  {
   if (instance == null || instance.container == null)
   {
    string configFile = "Unity.config";
    var fileMap = new ExeConfigurationFileMap { ExeConfigFilename = configFile };
    //从config文件中读取配置信息
    Configuration configuration = ConfigurationManager.OpenMappedExeConfiguration(fileMap, ConfigurationUserLevel.None);
    //获取指定名称的配置节
    UnityConfigurationSection section = (UnityConfigurationSection)configuration.GetSection("unity");
    instance = new UnitySingleton()
    {
     //container = new UnityContainer().LoadConfiguration((UnityConfigurationSection)ConfigurationManager.GetSection("unity"), "MyContainer")
     container = new UnityContainer().LoadConfiguration(section, "MyContainer")
     //container = new UnityContainer()
    };
    //instance.container.RegisterType<IExampleClass, ExampleClass>();
   }
   return instance;
  }

  //IOC注入实体
  public static T GetInstanceDAL<T>()
  {
   return getInstance().container.Resolve<T>();
  }
 }
}

public interface IExampleClass
{
 void DoHelloWord();
}

public class ExampleClass : IExampleClass
 {
  public void DoHelloWord()
  {
   Console.WriteLine("Hello Word!");
  }
 }

public class DIExampleClass
 {
  //属性注入
  [Dependency]
  public IExampleClass example { get; set; }
  
  private IExampleClass testInject;

  public void DoWork()
  {
   example.DoHelloWord();
   testInject.DoHelloWord();
  }

  //方法注入
  [InjectionMethod]
  public void Initialize(IExampleClass instance)
  {
   testInject = instance;
  }
 }

<"1.0" encoding="utf-8" "unity" type="Microsoft.Practices.Unity.Configuration.UnityConfigurationSection,Microsoft.Practices.Unity.Configuration" />
 </configSections>
 <unity>
 <!--定义类型别名-->
 <aliases>
  <add alias="IExampleClass" type="UnityIocTest.IExampleClass,UnityIocTest" />
  <add alias="ExampleClass" type="UnityIocTest.ExampleClass,UnityIocTest" />
 </aliases>
 <!--容器-->
 <container name="MyContainer">
  <!--映射关系-->
  <!--<register type="IExampleClass" mapTo="ExampleClass"></register>-->
  <register type="UnityIocTest.IExampleClass,UnityIocTest" mapTo="UnityIocTest.ExampleClass,UnityIocTest"></register>
 </container>
 </unity>
</configuration>

class Program
 {
  static void Main(string[] args)
  {
   //var dao = UnitySingleton.GetInstanceDAL<IExampleClass>();
   var dao = UnitySingleton.GetInstanceDAL<DIExampleClass>();
   dao.DoWork();
   Console.ReadLine();
  }
 }