依赖注入和控制反转是对同一件事情的不同描述，从某个方面讲，就是它们描述的角度不同。依赖注入是从应用程序的角度在描述，可以把依赖注入描述完整点：应用程序依赖容器创建并注入它所需要的外部资源；而控制反转是从容器的角度在描述，描述完整点：容器控制应用程序，由容器反向的向应用程序注入应用程序所需要的外部资源。
第一步：在项目中添加Unity（通过nuget直接获取）
第二步：Unity简单使用步骤
1创建容器
2注册接口映射
3获取实例
1.1通过代码方式进行注册
2.2通过配置文件方式进行注册
附源码：
web.config配置文件
<?xml version="1.0" encoding="utf-8"?>
<!--
For more information on how to configure your ASP.NET application, please visit
http://go.microsoft.com/fwlink/?LinkId=301880
-->
<configuration>
<configSections>
<!-- For more information on Entity Framework configuration, visit http://go.microsoft.com/fwlink/?LinkID=237468 -->
<section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
<section name="RedisConfig" type="MyBolg.Redis.RedisConfigInfo, MyBolg" />
<section name="unity" type="Microsoft.Practices.Unity.Configuration.UnityConfigurationSection,Microsoft.Practices.Unity.Configuration"/>
</configSections>
<unity xmlns="http://schemas.microsoft.com/practces/2010/unity">
<containers>
<!--MyContainer为自定义名称 只需要和调用时名称保持一致即可-->
<container name="MyContainer">
<!--type为对象的名称,mapTo为注入对象的名称 写法为用逗号隔开两部分，一是类的全部，包括命名空间，二是程序集名称-->
<register type="MyBolg.Controllers.Ilog,MyBolg" mapTo="MyBolg.Controllers.FileLog,MyBolg">
<lifetime type="singleton" />
</register>
</container>
</containers>
</unity>
<RedisConfig WriteServerList="127.0.0.1:6379" ReadServerList="127.0.0.1:6379" MaxWritePoolSize="60" MaxReadPoolSize="60" AutoStart="true" LocalCacheTime="180" RecordeLog="false">
</RedisConfig>
<connectionStrings>
<add name="DefaultConnection" connectionString="Data Source=(LocalDb)MSSQLLocalDB;AttachDbFilename=|DataDirectory|aspnet-MyBolg-20170628095130.mdf;Initial Catalog=aspnet-MyBolg-20170628095130;Integrated Security=True" providerName="System.Data.SqlClient" />
<add name="mmsql" connectionString="Data Source=bds278166222.my3w.com;Initial Catalog=bds278166222_db;User ID=bds278166222;pwd=wangjun1234" />
<add name="MyBolgEntities" connectionString="metadata=res://*/EFModel.Model1.csdl|res://*/EFModel.Model1.ssdl|res://*/EFModel.Model1.msl;provider=System.Data.SqlClient;provider connection string="data source=bds278166222.my3w.com;initial catalog=bds278166222_db;user id=bds278166222;password=wangjun1234;MultipleActiveResultSets=True;App=EntityFramework"" providerName="System.Data.EntityClient" /><add name="BolgModel" connectionString="data source=bds278166222.my3w.com;initial catalog=bds278166222_db;user id=bds278166222;password=wangjun1234;MultipleActiveResultSets=True;App=EntityFramework" providerName="System.Data.SqlClient" /></connectionStrings>
<appSettings>
<add key="webpages:Version" value="3.0.0.0" />
<add key="webpages:Enabled" value="false" />
<add key="ClientValidationEnabled" value="true" />
<add key="UnobtrusiveJavaScriptEnabled" value="true" />
</appSettings>
<system.web>
<authentication mode="None" />
<compilation debug="true" targetFramework="4.5.2" />
<httpRuntime targetFramework="4.5.2" />
<httpModules>
<add name="ApplicationInsightsWebTracking" type="Microsoft.ApplicationInsights.Web.ApplicationInsightsHttpModule, Microsoft.AI.Web" />
</httpModules>
</system.web>
<system.webServer>
<modules>
<remove name="FormsAuthentication" />
<remove name="ApplicationInsightsWebTracking" />
<add name="ApplicationInsightsWebTracking" type="Microsoft.ApplicationInsights.Web.ApplicationInsightsHttpModule, Microsoft.AI.Web" preCondition="managedHandler" />
</modules>
<validation validateIntegratedModeConfiguration="false" />
</system.webServer>
<runtime>
<assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
<dependentAssembly>
<assemblyIdentity name="Microsoft.Owin.Security" publicKeyToken="31bf3856ad364e35" />
<bindingRedirect oldVersion="0.0.0.0-3.0.1.0" newVersion="3.0.1.0" />
</dependentAssembly>
<dependentAssembly>
<assemblyIdentity name="Microsoft.Owin.Security.OAuth" publicKeyToken="31bf3856ad364e35" />
<bindingRedirect oldVersion="0.0.0.0-3.0.1.0" newVersion="3.0.1.0" />
</dependentAssembly>
<dependentAssembly>
<assemblyIdentity name="Microsoft.Owin.Security.Cookies" publicKeyToken="31bf3856ad364e35" />
<bindingRedirect oldVersion="0.0.0.0-3.0.1.0" newVersion="3.0.1.0" />
</dependentAssembly>
<dependentAssembly>
<assemblyIdentity name="Microsoft.Owin" publicKeyToken="31bf3856ad364e35" />
<bindingRedirect oldVersion="0.0.0.0-3.0.1.0" newVersion="3.0.1.0" />
</dependentAssembly>
<dependentAssembly>
<assemblyIdentity name="Newtonsoft.Json" culture="neutral" publicKeyToken="30ad4fe6b2a6aeed" />
<bindingRedirect oldVersion="0.0.0.0-6.0.0.0" newVersion="6.0.0.0" />
</dependentAssembly>
<dependentAssembly>
<assemblyIdentity name="System.Web.Optimization" publicKeyToken="31bf3856ad364e35" />
<bindingRedirect oldVersion="1.0.0.0-1.1.0.0" newVersion="1.1.0.0" />
</dependentAssembly>
<dependentAssembly>
<assemblyIdentity name="WebGrease" publicKeyToken="31bf3856ad364e35" />
<bindingRedirect oldVersion="0.0.0.0-1.5.2.14234" newVersion="1.5.2.14234" />
</dependentAssembly>
<dependentAssembly>
<assemblyIdentity name="System.Web.Helpers" publicKeyToken="31bf3856ad364e35" />
<bindingRedirect oldVersion="1.0.0.0-3.0.0.0" newVersion="3.0.0.0" />
</dependentAssembly>
<dependentAssembly>
<assemblyIdentity name="System.Web.Mvc" publicKeyToken="31bf3856ad364e35" />
<bindingRedirect oldVersion="1.0.0.0-5.2.3.0" newVersion="5.2.3.0" />
</dependentAssembly>
<dependentAssembly>
<assemblyIdentity name="System.Web.WebPages" publicKeyToken="31bf3856ad364e35" />
<bindingRedirect oldVersion="1.0.0.0-3.0.0.0" newVersion="3.0.0.0" />
</dependentAssembly>
</assemblyBinding>
</runtime>
<entityFramework>
<defaultConnectionFactory type="System.Data.Entity.Infrastructure.SqlConnectionFactory, EntityFramework" />
<providers>
<provider invariantName="System.Data.SqlClient" type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer" />
</providers>
</entityFramework>
<system.codedom>
<compilers>
<compiler language="c#;cs;csharp" extension=".cs" type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.CSharpCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" warningLevel="4" compilerOptions="/langversion:6 /nowarn:1659;1699;1701" />
<compiler language="vb;vbs;visualbasic;vbscript" extension=".vb" type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.VBCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" warningLevel="4" compilerOptions="/langversion:14 /nowarn:41008 /define:_MYTYPE="Web" /optionInfer+" />
</compilers>
</system.codedom>
</configuration>
Ioc控制器
using Microsoft.Practices.Unity;
using Microsoft.Practices.Unity.Configuration;
using System;
using System.Collections.Generic;
using System.Configuration;
using System.Linq;
using System.Web;
using System.Web.Mvc;
namespace MyBolg.Controllers
{
public class IOCController : Controller
{
// GET: IOC
public ActionResult Index()
{
//Unity简单步骤
//1.创建容器
//2.注册接口映射
//3.获取实例
#region 通过代码方式进行注册
//IUnityContainer parentContainer = new UnityContainer();
////父容器可以创建子容器
//IUnityContainer childerContainer = parentContainer.CreateChildContainer();
//parentContainer.RegisterType<Ilog, MyBolg.Controllers.FileLog>();
////给datalog在容器中起个名字，以后根据名字得到database
//parentContainer.RegisterType<Ilog, MyBolg.Controllers.DateLog>("database");
//Ilog textlog = parentContainer.Resolve<Ilog>();
//string str = textlog.savaLog("这是文件日志保存的实例");
//Ilog datalog = parentContainer.Resolve<Ilog>("database");
//str += datalog.savaLog("---这是数据日志保存的实例");
//ViewBag.str = str;
#endregion
#region 根据配置文件方式进行依赖注入
IUnityContainer container = new UnityContainer();
UnityConfigurationSection config = (UnityConfigurationSection)ConfigurationManager.GetSection(UnityConfigurationSection.SectionName);
config.Configure(container, "MyContainer");
Ilog log = container.Resolve<DateLog>();
string str = log.savaLog("这是数据日志保存的内容");
Ilog logs = container.Resolve<FileLog>();
str += logs.savaLog("---这是通过文件日志保存的文件");
ViewBag.str = str;
#endregion
return View();
}
}
public interface Ilog {
string savaLog(string messgae);
}
public class FileLog : Ilog
{
public string savaLog(string messgae)
{
return messgae;
}
}
public class DateLog : Ilog
{
public string savaLog(string messgae)
{
return messgae;
}
}
}
view视图
@{
Layout = null;
}
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width" />
<title>Index</title>
</head>
<body>
<div>
@ViewBag.str
</div>
</body>
</html>