利用.net Core 对程序集中的类 进行统一依赖注入

using Microsoft.Extensions.DependencyInjection;using System;using System.Collections.Generic;namespace Util.Attributes{ ???/// <summary> ???/// 标注要运用DI的类 被此属性标注的类 要被注册到依赖注入容器中 并且可以指定类要映射的接口或者类 ???/// 此属性只能运用于类，并且此属性不能继承 ???/// </summary> ???[AttributeUsage(AttributeTargets.Class,Inherited =false)] ???public class UseDIAttribute:Attribute ???{ ???????//Targets用于指示 哪些接口或者类 要被 "被属性修饰了的类" 进行依赖注入 ???????public List<Type> TargetTypes=new List<Type>(); ???????public ServiceLifetime lifetime; ???????public UseDIAttribute(ServiceLifetime argLifetime,params Type[] argTargets) ???????{ ???????????lifetime = argLifetime; ???????????foreach (var argTarget in argTargets) ???????????{ ???????????????TargetTypes.Add(argTarget); ???????????} ???????} ???????public List<Type> GetTargetTypes() ???????{ ???????????return TargetTypes; ???????} ???????public ServiceLifetime Lifetime ???????{ ???????????get ???????????{ ???????????????return this.lifetime; ???????????} ???????} ???}}

using Microsoft.EntityFrameworkCore;using Microsoft.Extensions.DependencyInjection;using System.Linq;using System.Threading.Tasks;using User.Domain;using User.Domain.POCOModels;using Util.Attributes;namespace DDD.Repositories.UserRepositories{ ???[UseDI(ServiceLifetime.Scoped,typeof(ILoginRepository))] ???public class LoginEFCoreRepository:ILoginRepository ???{ ???????private readonly DbContext dbContext; ???????public LoginEFCoreRepository(DbContext dbContext) ???????{ ???????????this.dbContext = dbContext; ???????}

using Microsoft.Extensions.DependencyInjection;using System;using System.Collections.Generic;using System.Linq;using System.Reflection;using Util.Attributes;namespace Util.DIPlugin{ ???public static class NetCoreDIModuleRegister ???{ ???????/// <summary> ???????/// 自动注册服务 ???????/// </summary> ???????/// <param name="services">注册服务的集合（向其中注册）</param> ???????/// <param name="ImplementationType">要注册的类型</param> ???????public static void AutoRegisterService(this IServiceCollection services, Type ImplementationType) ???????{ ???????????//获取类型的 UseDIAttribute 属性 对应的对象 ???????????UseDIAttribute attr = ImplementationType.GetCustomAttribute(typeof(UseDIAttribute)) as UseDIAttribute; ???????????////获取类实现的所有接口 ???????????//Type[] types = ImplementationType.GetInterfaces(); ???????????List<Type> types = attr.GetTargetTypes(); ???????????var lifetime = attr.Lifetime; ???????????//遍历类实现的每一个接口 ???????????foreach (var t in types) ???????????{ ???????????????//将类注册为接口的实现-----但是存在一个问题，就是担心 如果一个类实现了IDisposible接口 担心这个类变成了这个接口的实现 ???????????????ServiceDescriptor serviceDescriptor = new ServiceDescriptor(t, ImplementationType, lifetime); ???????????????services.Add(serviceDescriptor); ???????????} ???????} ???????/// <summary> ???????/// 根据程序集的名字获取程序集中所有的类型集合 ???????/// </summary> ???????/// <param name="AssemblyName">程序集名字</param> ???????/// <returns>类型集合</returns> ???????public static Type[] GetTypesByAssemblyName(String AssemblyName) ???????{ ???????????Assembly assembly = Assembly.Load(AssemblyName); ???????????return assembly.GetTypes(); ???????} ???????#region 将程序集中的所有符合条件的类型全部注册到 IServiceCollection 中 重载1 ???????/// <summary> ???????/// 将程序集中的所有符合条件的类型全部注册到 IServiceCollection 中 ???????/// </summary> ???????/// <param name="services">IServiceCollection</param> ???????/// <param name="AassemblyName">程序集名字</param> ???????public static void AutoRegisterServicesFromAssembly(this IServiceCollection services, ???????????string AassemblyName) ???????{ ???????????//根据程序集的名字 获取程序集中所有的类型 ???????????Type[] types = GetTypesByAssemblyName(AassemblyName); ???????????//过滤上述程序集 首先按照传进来的条件进行过滤 接着要求Type必须是类，而且不能是抽象类 ???????????IEnumerable<Type> _types = types.Where(t => t.IsClass && !t.IsAbstract); ???????????foreach (var t in _types) ???????????{ ???????????????IEnumerable<Attribute> attrs = t.GetCustomAttributes(); ???????????????//遍历类的所有特性 ???????????????foreach (var attr in attrs) ???????????????{ ???????????????????//如果在其特性中发现特性是 UseDIAttribute 特性 就将这个类注册到DI容器中去 ???????????????????//并跳出当前的循环 开始对下一个类进行循环 ???????????????????if (attr is UseDIAttribute) ???????????????????{ ???????????????????????services.AutoRegisterService(t); ???????????????????????break; ???????????????????} ???????????????} ???????????} ???????} ???????#endregion ???????#region 将程序集中的所有符合条件的类型全部注册到 IServiceCollection 中 重载2 ???????/// <summary> ???????/// 将程序集中的所有符合条件的类型全部注册到 IServiceCollection 中 ???????/// </summary> ???????/// <param name="services">IServiceCollection</param> ???????/// <param name="AassemblyName">程序集名字</param> ???????/// <param name="wherelambda">过滤类型的表达式</param> ???????public static void AutoRegisterServicesFromAssembly(this IServiceCollection services, ???????????string AassemblyName, Func<Type, bool> wherelambda) ???????{ ???????????//根据程序集的名字 获取程序集中所有的类型 ???????????Type[] types = GetTypesByAssemblyName(AassemblyName); ???????????//过滤上述程序集 首先按照传进来的条件进行过滤 接着要求Type必须是类，而且不能是抽象类 ???????????IEnumerable<Type> _types = types.Where(wherelambda).Where(t => t.IsClass && !t.IsAbstract); ???????????foreach (var t in _types) ???????????{ ???????????????IEnumerable<Attribute> attrs = t.GetCustomAttributes(); ???????????????//遍历类的所有特性 ???????????????foreach (var attr in attrs) ???????????????{ ???????????????????//如果在其特性中发现特性是 UseDIAttribute 特性 就将这个类注册到DI容器中去 ???????????????????//并跳出当前的循环 开始对下一个类进行循环 ???????????????????if (attr is UseDIAttribute) ???????????????????{ ???????????????????????services.AutoRegisterService(t); ???????????????????????break; ???????????????????} ???????????????} ???????????} ???????} ???????#endregion ???}}