.Net core使用Autofac进行依赖注入示例

一、官方文档

https://autofaccn.readthedocs.io/zh/latest/index.html

二、新建.net core 控制台程序

三、注册类型，示例一

1、新建接口 IPerson

    public interface IPerson
    {
        void Introduction();
    }

2、实现接口，新建类Worker

    public class Worker : IPerson
    {
        public void Introduction()
        {
            Console.WriteLine("I am a worker");
        }
    }

3、新建类RegisterConsoles并注册组件

　　public class RegisterConsoles
    {/// <summary>
        /// 通过类型注册来注入
        /// </summary>
        public static void TypeRun()
        {
            var builder = new ContainerBuilder();
            builder.RegisterType<Worker>().As<IPerson>();
            var container = builder.Build();
            var serviceProvider = new AutofacServiceProvider(container);
            var person = serviceProvider.GetService<IPerson>();
            person.Introduction();
            Console.ReadKey();
        }
    }

4、执行程序

    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("autofac demo");
            RegisterConsoles.TypeRun();
        }
    }

输出如图信息：

四、如果有很多组件需要注册呢，难道每一个都要写一行代码吗，显然是不合适的。因此可以通过程序集反射来注册

示例二：

1、新建接口

    /// <summary>
    /// 继承此接口则自动注入
    /// </summary>
    public interface IDependency
    {
    }

2、添加自动注入的逻辑，新建类AutoRegister

    public class AutoRegister
    {
        /// <summary>
        /// 自动注入
        /// </summary>
        /// <returns></returns>
        public AutofacServiceProvider Build()
        {
            var builder = new ContainerBuilder();
            Type dependencyType = typeof(IDependency);
            var assemblys = AppDomain.CurrentDomain.GetAssemblies().ToArray();
            builder.RegisterAssemblyTypes(assemblys)
                .Where(type => dependencyType.IsAssignableFrom(type) && !type.IsAbstract)
                .AsImplementedInterfaces().InstancePerLifetimeScope();
            var container = builder.Build();
            var serviceProvider = new AutofacServiceProvider(container);
            return serviceProvider;
        }
    }

3、新建类Teacher，实现接口IPerson,和IDependency

    class Teacher : IPerson, IDependency
    {
        public void Introduction()
        {
            Console.WriteLine("I am a teacher");
        }
    }

4、运行程序

        static void Main(string[] args)
        {
            Console.WriteLine("autofac demo");
            RegisterConsoles.AssemblyRun();
        }

输出如下图：

参考

https://stackoverflow.com/questions/26957519/ef-core-mapping-entitytypeconfiguration