2、MVC+IOC容器+ORM结合

1、常规写法，难道我们每次都new一个服务，如下面的userservice和companyservice然后调用服务的find方法去操作，为什么我们不让userservice和companyservice服务注入进来呢？ 

public actionresult index()
{
　　dbcontext context = new dbcontext();
　　iuserservice userservice = new userservice(context);
　　user user = userservice.find<user>(2); 
   return view(user); 
}

public actionresult index2()
{
　　dbcontext context = new dbcontext();
　　icompanyservice companyservice = new companyservice(context); 　　
   company company = companyservice.find<company>(2); 

   return view(company); 
}

 2、我们想要的实际效果是mvc请求进来的时候，实例化控制器的时候，就把userservice和companyservice服务注入进来，但是下面的带参数的控制器构造函数testcontroller(iuserservice userservice, icompanyservice companyservice)mvc是实例化不了的，mvc只能实例化不带参数的构造函数testcontroller()

 public class testcontroller : controller
 {
        private iuserservice _iuserservice = null;
        private icompanyservice _icompanyservice = null;
        /// <summary>
        /// 构造函数注入---控制器得是由容器来实例化
        /// </summary>
        /// <param name="userservice"></param>
        /// <param name="companyservice"></param>
        public testcontroller(iuserservice userservice, icompanyservice companyservice)
        {
            this._iuserservice = userservice;
            this._icompanyservice = companyservice;
        }
}

public actionresult index()
{
　　dbcontext context = new dbcontext();
　　iuserservice userservice = this._iuserservice;
　　user user = userservice.find<user>(2); 
   return view(user); 
}

public actionresult index2()
{
　　dbcontext context = new dbcontext();
　　icompanyservice companyservice = this._icompanyservice;
   company company = companyservice.find<company>(2); 

   return view(company); 
}

 3、在“1、看源码mvc如何实例化控制器”中提到mvc实例化控制器使用的是controllerbuilder.getcontrollerfactory()得到一个defaultcontrollerfactory工厂，然后用工厂的createcontroller方法利用反射去创建controller实例，那么我们可以把工厂换成自己实现的自定义工厂不就可以了吗，controllerbuilder还有个setcontrollerfactory方法，自定义的控制器工厂customcontrollerfactory继承defaultcontrollerfactory，微软的特点是virtual和abstract都是让我们来扩展的，那么我们复写getcontrollerinstance方法，在getcontrollerinstance方法里去构建容器

public class customcontrollerfactory : defaultcontrollerfactory
{
  　　protected override icontroller getcontrollerinstance(requestcontext requestcontext, type controllertype)
     {
            iunitycontainer container = difactory.getcontainer();
            //return base.getcontrollerinstance(requestcontext, controllertype);
            return (icontroller)container.resolve(controllertype);
     }
}

4、在application_start中指定自定义的控制器工厂

public class mvcapplication : system.web.httpapplication
{protected void application_start()
        {
            arearegistration.registerallareas();//注册区域
            filterconfig.registerglobalfilters(globalfilters.filters);//注册全局的filter
            routeconfig.registerroutes(routetable.routes);//注册路由
            bundleconfig.registerbundles(bundletable.bundles);//合并压缩 ，打包工具 combres
            controllerbuilder.current.setcontrollerfactory(new customcontrollerfactory());//设置自定义的控制器工厂
        }
}

5、依赖注入

public class difactory
{
        public static iunitycontainer getcontainer()
        {
            iunitycontainer container = null;
            //container.registertype
            execonfigurationfilemap filemap = new execonfigurationfilemap();
            filemap.execonfigfilename = path.combine(appdomain.currentdomain.basedirectory + "cfgfiles\\unity.config");
            configuration configuration = configurationmanager.openmappedexeconfiguration(filemap, configurationuserlevel.none);
            unityconfigurationsection section = (unityconfigurationsection)configuration.getsection(unityconfigurationsection.sectionname);
            container = new unitycontainer();
            section.configure(container, "mycontainer");

            return container;
        }
}

6、进行unity配置

<configuration>
  <configsections>
    <section name="unity" type="microsoft.practices.unity.configuration.unityconfigurationsection, unity.configuration"/>
  </configsections>
  <unity>
    <sectionextension type="microsoft.practices.unity.interceptionextension.configuration.interceptionconfigurationextension, unity.interception.configuration"/>
    <containers>
      <container name="mycontainer">
        <extension type="interception"/>
        <register type="system.data.entity.dbcontext, entityframework" mapto="schoolmanager.ef.model.schooldbentities, schoolmanager.ef.model"/>
        <register type="schoolmanager.bussiness.interface.icompanyservice,schoolmanager.bussiness.interface" mapto="schoolmanager.bussiness.service.companyservice, schoolmanager.bussiness.service"/>
        <register type="schoolmanager.bussiness.interface.iuserservice,schoolmanager.bussiness.interface" mapto="schoolmanager.bussiness.service.userservice, schoolmanager.bussiness.service"/>
      </container>
    </containers>
  </unity>
</configuration>