ASP.net Core自带DI(依赖注入),用法如下:
services.AddScoped(typeof(IProductService), typeof(ProductService));
如果服务较多,必定造成文件难以维护
所以需要利用反射批量实现注册
核心代码如下:
一个类可能间接继承了多个接口(例如:public 和internal的接口),这里我们就以实现类为Key,所继承的接口为value构造一个集合
/// <summary> ?????????/// 获取程序集中的实现类对应的多个接口 ???????/// </summary> ?????????/// <param name="assemblyName">程序集</param> ???????public Dictionary<Type, Type[]> GetClassName(string assemblyName) ???????{ ???????????if (!String.IsNullOrEmpty(assemblyName)) ???????????{ ???????????????Assembly assembly = Assembly.Load(assemblyName); ???????????????List<Type> ts = assembly.GetTypes().ToList(); ???????????????var result = new Dictionary<Type, Type[]>(); ???????????????foreach (var item in ts.Where(s => !s.IsInterface)) ???????????????{ ???????????????????var interfaceType = item.GetInterfaces(); ???????????????????result.Add(item, interfaceType); ???????????????} ???????????????return result; ???????????} ???????????return new Dictionary<Type, Type[]>(); ???????}注册:
我们现在可以把具体的注册例如
services.AddScoped(typeof(IProductService), typeof(ProductService));
改为:
//集中注册服务 ???????????foreach (var item in GetClassName("Service")) ???????????{ ???????????????foreach (var typeArray in item.Value) ???????????????{ ???????????????????services.AddScoped(typeArray, item.Key); ???????????????} ???????????}完整代码:
using System;using System.Collections.Generic;using System.Linq;using System.Threading.Tasks;using Microsoft.AspNetCore.Builder;using Microsoft.AspNetCore.Hosting;using Microsoft.Extensions.Configuration;using Microsoft.Extensions.DependencyInjection;using Microsoft.Extensions.Logging;using Microsoft.Extensions.Options;using Microsoft.EntityFrameworkCore;using Entity.Table;using DAL;using System.Reflection;using Service;namespace ASP.NetCoreAPI{ ???public class Startup ???{ ???????public Startup(IConfiguration configuration) ???????{ ???????????Configuration = configuration; ???????} ???????public IConfiguration Configuration { get; } ???????// This method gets called by the runtime. Use this method to add services to the container. ???????public void ConfigureServices(IServiceCollection services) ???????{ ???????????services.AddDbContext<ProductContext>(options => ???????????????options.UseMySql(Configuration.GetConnectionString("MySqlConnection")));//添加Mysql支持 ???????????//集中注册服务 ???????????foreach (var item in GetClassName("Service")) ???????????{ ???????????????foreach (var typeArray in item.Value) ???????????????{ ???????????????????services.AddScoped(typeArray, item.Key); ???????????????} ???????????} ???????????services.AddUnitOfWork<ProductContext>();//添加UnitOfWork支持 ????????????????????????????????????????????????????//services.AddScoped(typeof(IProductService), typeof(ProductService));//用ASP.NET Core自带依赖注入(DI)注入使用的类 ???????????services.AddMvc(); ???????} ???????// This method gets called by the runtime. Use this method to configure the HTTP request pipeline. ???????public void Configure(IApplicationBuilder app, IHostingEnvironment env) ???????{ ???????????if (env.IsDevelopment()) ???????????{ ???????????????app.UseDeveloperExceptionPage(); ???????????} ???????????app.UseMvc(); ???????} ???????/// <summary> ?????????/// 获取程序集中的实现类对应的多个接口 ???????/// </summary> ?????????/// <param name="assemblyName">程序集</param> ???????public Dictionary<Type, Type[]> GetClassName(string assemblyName) ???????{ ???????????if (!String.IsNullOrEmpty(assemblyName)) ???????????{ ???????????????Assembly assembly = Assembly.Load(assemblyName); ???????????????List<Type> ts = assembly.GetTypes().ToList(); ???????????????var result = new Dictionary<Type, Type[]>(); ???????????????foreach (var item in ts.Where(s => !s.IsInterface)) ???????????????{ ???????????????????var interfaceType = item.GetInterfaces(); ???????????????????result.Add(item, interfaceType); ???????????????} ???????????????return result; ???????????} ???????????return new Dictionary<Type, Type[]>(); ???????} ???}}利用ASP.netCore自带DI(DependencyInjection)实现批量依赖注入
原文地址：http://www.cnblogs.com/xiaoliangge/p/7642372.html