Autofac IOC框架

ASP.NET Core自带了一个轻量级的IOC容器     但是只提供了最基本的AddXXX方法来绑定实例关系     需要一个一个添加   可以使用其他IOC容器来替换内置的

ABP自带Castle容器

1.安装Nuget包 Autofac 和 Autofac.Extensions.DependencyInjection

2.使用Autofac替换自带的IOC容器

在Startup.cs中如果ConfigureServices方法返回类型是void  改成IServiceProvider

先定义一个容器        public Autofac.IContainer ApplicationContainer { get; private set; }

            services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_1);

            //实例化Autofac容器

            var builder = new ContainerBuilder();

            //将Services中的服务填充到Autofac中

            builder.Populate(services);

            //新模块组件注册

            builder.RegisterModule<AutofacModuleRegister>();

            //创建容器接收

            var Container = builder.Build();

            //这里可以不需要在上面定义ApplicationContainer  这句代码可以不要

            //this.ApplicationContainer = Container;

            //第三方IOC接管 core内置DI容器

            return new AutofacServiceProvider(Container);

AutofacModuleRegister.cs

    public class AutofacModuleRegister : Autofac.Module

    {

        //重写Autofac管道Load方法，在这里注册注入

        protected override void Load(ContainerBuilder builder)

        {

            //找到AutofacMvcDemo程序集中,以Service结尾的类,找到满足的类和实现的接口自动进行注册

            builder.RegisterAssemblyTypes(GetAssemblyByName("JcbApplication")).Where(a => a.Name.EndsWith("Service")).AsImplementedInterfaces();

            //找到Program类型所在的程序集,以Repository结尾的类,找到满足的类和实现的接口自动进行注册

            builder.RegisterAssemblyTypes(GetAssemblyByName("JcbApplication")).Where(a => a.Name.EndsWith("Repository")).AsImplementedInterfaces();

            //某个接口有多个实现类 需要特殊的进行手动注册 最后一个参数就是标识  字符串

            builder.RegisterType<SqlService>().Named<ISqlService>(typeof(SqlService).Name);

            builder.RegisterType<MySqlService>().Named<ISqlService>(typeof(MySqlService).Name);

        }

        /// <summary>

        /// 根据程序集名称获取程序集

        /// </summary>

        /// <param name="AssemblyName">程序集名称</param>

        /// <returns></returns>

        public static Assembly GetAssemblyByName(String AssemblyName)

        {

            return Assembly.Load(AssemblyName);

        }

    }

3.当一个接口有多个实例    使用的时候需要指定

    public class HomeController : Controller

    {

        private IPersonService _personService;

        private ISqlService _sqlService;

        private ISqlService _mysqlService;

        private IComponentContext _componentContext;//Autofac上下文

        public HomeController(IPersonService personService, IComponentContext componentContext)

        {

            this._personService = personService;

            this._componentContext = componentContext;

            this._sqlService = _componentContext.ResolveNamed<ISqlService>(typeof(SqlService).Name);

            this._mysqlService = _componentContext.ResolveNamed<ISqlService>(typeof(MySqlService).Name);

        }

        public IActionResult Index()

        {

            var aa = _personService.GetData();

            var bb = _sqlService.GetData();

            var cc = _mysqlService.GetData();

            return View();

        }

多种不同的注册方式

https://www.cnblogs.com/bluesummer/p/8875702.html

//注册同一接口的多个实例

https://www.cnblogs.com/wei325/p/9191686.html