• netcore 2.2 使用 Autofac 实现自动注入


    Autofac自动注入是通过名称约定来实现依赖注入

    ps:本demo接口层都以“I”开头,以“Service”结尾。服务层实现都以“Service”结尾。

    为什么要实现自动注入


    大多时候,我们都是 以下方式进行依赖注入

     public IServiceProvider ConfigureServices(IServiceCollection services)
     {
                services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_2);
                //初始化容器
                var builder = new ContainerBuilder();
                //管道寄居
                builder.Populate(services);
                builder.RegisterType<TestService>().As<ITestService>();//UserService注入到IUserService
                //构造
                ApplicationContainer = builder.Build();
                //将AutoFac反馈到管道中
                return new AutofacServiceProvider(ApplicationContainer);
     }

    随着业务的增长,接口跟实现类会越来越多,还需要手动一个个的注册依赖项,有时候会出现忘了写配置,导致程序报错,如果是多人开发,可能还会导致代码冲突,后期维护起来相对来说比较麻烦。

    实用Autofac自动注入

    public IServiceProvider ConfigureServices(IServiceCollection services)
     {
                services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_2);
                //初始化容器
                var builder = new ContainerBuilder();
                //管道寄居
                builder.Populate(services);
                //业务逻辑层所在程序集命名空间
                Assembly service = Assembly.Load("NetCoreDemo.Service");
                //接口层所在程序集命名空间
                Assembly repository = Assembly.Load("NetCoreDemo.Repository");
                //自动注入
                builder.RegisterAssemblyTypes(service, repository)
                    .Where(t => t.Name.EndsWith("Service"))
                    .AsImplementedInterfaces();
                //构造
                ApplicationContainer = builder.Build();
                //将AutoFac反馈到管道中
                return new AutofacServiceProvider(ApplicationContainer);
    }

    简单测试


    创建IUserService接口

     public interface ITestService
      {
           string Hello();
      }

    创建UserService实现类

    public class TestService : ITestService
    {
         public string Hello()
         {
              return "Hello Word";
         }
    }

    创建TestController控制器

    通过控制器的构造方法注入ITestService接口

        [Route("api/test")]
        [ApiController]
        public class TestController : Controller
        {
            private readonly ITestService _testService;
            /// <summary>
            /// 构造函数
            /// </summary>
            /// <param name="testService"></param>
            public TestController(ITestService testService)
            {
                _testService = testService;
            }
            [HttpGet]
            public string Hello()
            {
               var str= _testService.Hello();
               return str;
            }
        }

    运行

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  • 原文地址:https://www.cnblogs.com/netcs/p/12194893.html
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