ASP.NET Core必备知识之Autofac

使用Autofac替换掉微软的DI

本文的项目为ASP.NET Core3.1，传统三层架构 在这就不过多介绍Autofac，直接上代码

Autofac官网：https://autofac.org/

Program.cs的 IHostBuilder 方法内加上 .UseServiceProviderFactory(new AutofacServiceProviderFactory())（如下图）

    public static IHostBuilder CreateHostBuilder(string[] args) =>         Host.CreateDefaultBuilder(args)              .UseServiceProviderFactory(new AutofacServiceProviderFactory())//启用autofac容器             .ConfigureWebHostDefaults(webBuilder =>             {               webBuilder.UseStartup<Startup>();             });   } 

在Startup.cs内新增 ConfigureContainer 方法
属性介绍
RegisterAssemblyTypes：寄存器程序集类型
AsImplementedInterfaces：实现的接口
InstancePerDependency：实例依赖关系
PropertiesAutowired：属性自动连接

        /// <summary>         /// 配置Autofac容器替换微软的DI         /// </summary>         /// <param name="builder"></param>         public void ConfigureContainer(ContainerBuilder builder)         {             var basePath = AppContext.BaseDirectory;             //DALService所在程序集命名空间             string DALPath = Path.Combine(basePath, "GraduationProject.DAL.dll");             Assembly DAL = Assembly.LoadFrom(DALPath);             //BLLService所在程序集命名空间             string BLLPath = Path.Combine(basePath, "GraduationProject.BLL.dll");             Assembly BLL = Assembly.LoadFrom(BLLPath);              builder.RegisterAssemblyTypes(DAL).InstancePerDependency().PropertiesAutowired();             builder.RegisterAssemblyTypes(BLL).AsImplementedInterfaces().InstancePerDependency().PropertiesAutowired();         }