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