自动注入类

1、通过序反射获取父类接口

namespace Service.Basic
{
    using System;
    using System.Linq;
    using Microsoft.Extensions.DependencyInjection;

    /// <summary>
    /// 自动注入类
    /// </summary>
    public static class AutoDI
    {
        /// <summary>
        /// 注入来源类型下的所有类型
        /// </summary>
        /// <param name="services">服务配置接口</param>
        /// <param name="source">接口实现类的类型</param>
        /// <returns>注入完的服务配置</returns>
        public static IServiceCollection AutoInjection(this IServiceCollection services, Type source)
        {
            // 获取实现了接口IDenpendency和IDenpendcySingleton的程序集
            var allTypes = AppDomain.CurrentDomain.GetAssemblies().SelectMany(a => a.GetTypes().Where(t => t.GetInterfaces().Contains(source)));

            // class的程序集
            var implementTypes = allTypes.Where(x => x.IsClass).ToArray();

            // 接口的程序集
            var interfaceTypes = allTypes.Where(x => x.IsInterface).ToArray();
            foreach (var implementType in implementTypes)
            {
                var interfaces = interfaceTypes.Where(x => x.IsAssignableFrom(implementType)).ToList();

                foreach (var inter in interfaces)
                {
                    // class有接口，用接口注入
                    if (inter != null)
                    {
                        // 判断用什么方式注入
                        if (inter.GetInterfaces().Contains(source))
                        {
                            services.AddScoped(inter, implementType);
                        }
                    }
                }

                if (implementType.GetInterfaces().Contains(source))
                {
                    services.AddTransient(implementType);
                }
            }

            return services;
        }
    }
}

2、定义父类接口

/// <summary>
    /// 通用接口
    /// </summary>
    public interface IDenpendency
    {
    }

3、父类接口用法

    /// <summary>
    /// 演示接口
    /// </summary>
    public interface IDemo : IDenpendency
    {
        /// <summary>
        /// 获取当前时间
        /// </summary>
        /// <returns>返回当前时间</returns>
        Task<DateTime> GetDateTimeNow();
    }

4、在程序启动注入父类接口

            // 自动注入接口/类
            services.AutoInjection(typeof(IDenpendency));