.NET Core下自带容器IServiceCollection以及AutoFac以及AutoFac中AOP简介

https://www.cnblogs.com/artech/p/net-core-di-01.html 大内老A的在.NET Core下对这些的介绍,有一系列文章

https://www.cnblogs.com/jesse2013/p/di-in-aspnetcore.html

https://www.cnblogs.com/artech/p/dependency-injection-in-asp-net-core.html

https://www.zybuluo.com/dasajia2lang/note/1481011

下面开始

在上一篇的笔记中,在.NET Freamwork中,有一个第三方容器Unity,可以实现注入,但是在.NET Core里面,有一个IServiceCollection,这个是.NET Core框架自带的一个容器,和Unity很相似,都是个容器。

下面我们新建一个控制台程序,在控制台程序中,对IServiceCollection的使用做介绍。

下面代码,是本次实例中需要注入的类型,需要用的倒是再点开来看吧

namespace Bingle.Core.Interface
{
    public interface ITestServiceA
    {
        void Show();
    }
}
namespace Bingle.Core.Service
{
    public class TestServiceA : ITestServiceA
    {
        public void Show()
        {
            Console.WriteLine("A123456");
        }
    }
}

namespace Bingle.Core.Interface
{
    public interface ITestServiceB
    {
        void Show();
    }
}

namespace Bingle.Core.Service
{
    public class TestServiceB : ITestServiceB
    {
        
        public TestServiceB(ITestServiceA iTestService)
        {
          
        }


        public void Show()
        { 
            Console.WriteLine($"This is TestServiceB B123456");
        }
    }
}


namespace Bingle.Core.Interface
{
    public interface ITestServiceC
    {
        void Show();
    }
}

namespace Bingle.Core.Service
{
    public class TestServiceC : ITestServiceC
    {
        public TestServiceC(ITestServiceB iTestServiceB)
        {
        }
        public void Show()
        {
            Console.WriteLine("C123456");
        }
    }
}

namespace Bingle.Core.Interface
{
    public interface ITestServiceD
    {
        void Show();
    }
}

namespace Bingle.Core.Service
{
    public class TestServiceD : ITestServiceD
    {
        public void Show()
        {
            Console.WriteLine("D123456");
        }
    }
}
View Code

需要通过Nuget包,把IServiceCollection依赖的dll文件进入进来

Microsoft.Extensions.DependencyInjection

使用容器的三部曲:实例化一个容器、注册、获取服务

 IServiceCollection container = new ServiceCollection();
 // IServiceCollection
 container.AddTransient();  // 瞬时生命周期  每一次获取的对象都是新的对象
 container.AddSingleton(); // 单例生命周期  在容器中永远只有当前这一个
 container.AddScoped();    //当前请求作用域内  只有当前这个实例

 container.AddSingleton(new TestServiceD());  // 也是单例生命周期

 ServiceProvider provider = container.BuildServiceProvider();

 ITestServiceA testA = provider.GetService();
 ITestServiceA testA1 = provider.GetService();
 Console.WriteLine(object.ReferenceEquals(testA, testA1));

 ITestServiceB testB = provider.GetService();
 ITestServiceB testB1 = provider.GetService();
 Console.WriteLine(object.ReferenceEquals(testB, testB1));
  
 ITestServiceC testC = provider.GetService();
 ITestServiceC testC1 = provider.GetService();
 Console.WriteLine(object.ReferenceEquals(testC, testC1));
  
 IServiceScope scope = provider.CreateScope();
 ITestServiceC testc3 = provider.GetService();
 var testc4 = scope.ServiceProvider.GetService();
 Console.WriteLine(object.ReferenceEquals(testc3, testc4));
  
 ITestServiceD testD = provider.GetService();
 ITestServiceD testD1 = provider.GetService();
 Console.WriteLine(object.ReferenceEquals(testD, testD1));

 

AutoFac也是个容器,下面在Core中把AutoFac整合进来。

1、在Nuget中添加AutoFac

.NET Core下自带容器IServiceCollection以及AutoFac以及AutoFac中AOP简介_第1张图片

 

 2、ConfigureService需要一个返回值,IServiceProvider(在.NET Core3.0中不需要替换)

 

 

 3、实例化一个容器:

ContainerBuilder containerbuilder = new ContainerBuilder();

4、注册服务,自定义一个类型,继承Module,并重写Load方法:

public class CustomAutofacModule:Module
{ 
    /// 
    ///  当前这Module 专用做服务注册
    /// 
    /// 
    protected override void Load(ContainerBuilder builder)
    {
        builder.RegisterType().As().SingleInstance();
        builder.RegisterType().As().SingleInstance();
        builder.RegisterType().As().SingleInstance();
        builder.RegisterType().As().SingleInstance();
    }
}

在Startup.cs中的ConfigureServices()方法中加上一下代码:

// services 默认的注册服务,还需要处理控制器实例相关的的工作。 
containerbuilder.Populate(services); // autofac 全权接管了之前这个Service的所有工作

containerbuilder.RegisterModule();
IContainer container = containerbuilder.Build();
return new AutofacServiceProvider(container);

AutoFac支持AOP

 AOP存在的意义,是在这个方法执行之前做什么事,做完这个方法之后,又做什么事。

1、安装nuget包,DynamicProxy

.NET Core下自带容器IServiceCollection以及AutoFac以及AutoFac中AOP简介_第2张图片

 

 2、自定义一个类,继承IInterceptor接口

 public class CustomAutofacAOP : IInterceptor
 {
     public void Intercept(IInvocation invocation)
     {
         Console.WriteLine($"method is {invocation.Method.Name}");
         Console.WriteLine($"Arguments is {string.Join(';', invocation.Arguments)}");

         invocation.Proceed();// 这里表示继续执行,就去执行之前应该执行的动作了

         Console.WriteLine("**************");

     }
 }

在之前的CustomAutofacModule也要稍作修改:

.NET Core下自带容器IServiceCollection以及AutoFac以及AutoFac中AOP简介_第3张图片

 

 

 添加两个测试类:

 

 public interface IA
 {
     void Show();
 }

 [Intercept(typeof(CustomAutofacAOP))]
 public class A : IA
 {
     public void Show()
     {
         Console.WriteLine("Cm");
     }
 }

 

 

 

 在一个控制器下,通过构造函数的方式来实现注入:

 public class BingleController : Controller
 {
     private ILoggerFactory _factory = null;
     private ILogger _ilogger = null;

     private ITestServiceA _testServiceA = null;
     private ITestServiceB _testServiceB = null;
     private ITestServiceC _testServiceC = null;
     private ITestServiceD _testServiceD = null;
     private IA _a = null;

     public BingleController(ILoggerFactory factory, ILogger ilogger,
       ITestServiceA testServiceA,
       ITestServiceB testServiceB,
       ITestServiceC testServiceC,
       ITestServiceD testServiceD,
       IA a)
     {
         _factory = factory;
         _ilogger = ilogger;
         _testServiceA = testServiceA;
         _testServiceB = testServiceB;
         _testServiceC = testServiceC;
         _testServiceD = testServiceD;
         _a = a;
     }

}

 

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