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Autofac 官方地址：https://autofaccn.readthedocs.io/en/latest/advanced/interceptors.html

（1）引用 nuget :Autofac.Extensions.DependencyInjection　　Autofac.Extras.DynamicProxy

（2）修改入口文件

public static IHostBuilder CreateHostBuilder(string[] args) =>
            Host.CreateDefaultBuilder(args)
                //改用Autofac来实现依赖注入
                .UseServiceProviderFactory(new AutofacServiceProviderFactory())
                .ConfigureWebHostDefaults(webBuilder =>
                {
                    webBuilder.UseStartup<Startup>();
                    
                });

（3）修改startup 文件

     //autofac 新增
        public ILifetimeScope AutofacContainer { get; private set; }
  public void ConfigureContainer(ContainerBuilder builder)
        {
}

（4）创建AOP拦截文件

using Castle.DynamicProxy;
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Threading.Tasks;

namespace WebApplication1.Aufac
{
    public class CacheIntercept : IInterceptor
    {
        public CacheIntercept()
        { }
        public void Intercept(IInvocation invocation)
        {
            var method = invocation.MethodInvocationTarget ?? invocation.Method;
            Debug.WriteLine("before");
            invocation.Proceed();
            Debug.WriteLine("end");
        }
    }
}

（4）应用拦截效果

      4-1 使用类进行AOP

       4.1.1 创建以下类文件

using Autofac.Extras.DynamicProxy;
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Threading.Tasks;

namespace WebApplication1.Aufac
{

/// <summary>
/// 类的AOP方式2
/// </summary>
[Intercept(typeof(CacheIntercept))]

    public class AufacClass1
    {
        /// <summary>
        /// 必须是virtual
        /// </summary>
        /// <returns></returns>
        public virtual string GetName()
        {
            Debug.WriteLine("this is getname");
            return "this is getname";
        }
    }
}

4.1.2配置startup 注入到服务

        //autofac 新增
        public void ConfigureContainer(ContainerBuilder builder)
        {

builder.RegisterType<WebApplication1.Aufac.AufacClass2>().EnableClassInterceptors();
builder.Register(c => new WebApplication1.Aufac.CacheIntercept());

}

4.1.3在代码里调用 发现已经进行了拦截处理

调用代码如下

WebApplication1.Aufac.AufacClass2 face2;
public WeatherForecastController(WebApplication1.Aufac.AufacClass2 interFace1
)
{
face2 = interFace2;
}
[HttpGet]
//[Caching(AbsoluteExpiration =2,keyname ="id",keyvaluename ="id")]
public  string Get()
{
face2.GetName();
return DateTime.Now.ToString();
}