NET CORE 业务层服务自动注册——DI

核心代码
AutoInjectRepository 类里的服务发现并自动注册是看服务实现类上有没有[AutoInject(typeof(IIndustryService), InjectType.Scope)]这个标签。有这个标签就会被注册

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Reflection;
using Microsoft.Extensions.DependencyInjection;

namespace CommonHelper.AutoInject.Service
{
    public static class AutoInjectRepository
    {
        public static IServiceCollection AddAutoDi(this IServiceCollection serviceCollection)
        {
            foreach (Assembly item in Directory.GetFiles(AppDomain.CurrentDomain.BaseDirectory, "*.dll").Select(Assembly.LoadFrom).ToList())
            {
                List<Type> list = (from a in item.GetTypes()
                                   where a.GetCustomAttribute<AutoInjectAttribute>() != null
                                   select a).ToList();
                if (list.Count <= 0)
                {
                    continue;
                }

                foreach (Type item2 in list)
                {
                    AutoInjectAttribute customAttribute = item2.GetCustomAttribute<AutoInjectAttribute>();
                    if (!(customAttribute?.Type == null))
                    {
                        switch (customAttribute.InjectType)
                        {
                            case InjectType.Scope:
                                serviceCollection.AddScoped(customAttribute.Type, item2);
                                break;
                            case InjectType.Single:
                                serviceCollection.AddSingleton(customAttribute.Type, item2);
                                break;
                            case InjectType.Transient:
                                serviceCollection.AddTransient(customAttribute.Type, item2);
                                break;
                            default:
                                throw new ArgumentOutOfRangeException();
                        }
                    }
                }
            }

            return serviceCollection;
        }

        public static IServiceCollection AddAutoDiService(this IServiceCollection serviceCollection, string namespaceName)
        {
            foreach (Type item in getTypesInNamespace(namespaceName))
            {
                AutoInjectAttribute customAttribute = item.GetCustomAttribute<AutoInjectAttribute>();
                if (!(customAttribute?.Type == null))
                {
                    switch (customAttribute.InjectType)
                    {
                        case InjectType.Scope:
                            serviceCollection.AddScoped(customAttribute.Type, item);
                            break;
                        case InjectType.Single:
                            serviceCollection.AddSingleton(customAttribute.Type, item);
                            break;
                        case InjectType.Transient:
                            serviceCollection.AddTransient(customAttribute.Type, item);
                            break;
                        default:
                            throw new ArgumentOutOfRangeException();
                    }
                }
            }

            return serviceCollection;
        }

        private static List<Type> getTypesInNamespace(string namespaceName)
        {
            return Assembly.Load(namespaceName).GetTypes().ToList();
        }
    }
}

Startup.cs 文件的服务自动注册功能，

using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.HttpsPolicy;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Logging;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using LD.Admin.Models;
using Microsoft.OpenApi.Models;
using System.Reflection;
using System.IO;
using Swashbuckle.AspNetCore.SwaggerUI;
using CommonHelper.AutoInject.Service;
using LD.Admin.Service.RegisterService;
using LD.Admin.Repository.Factory;
using LD.Admin.Api.Models;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Authentication.JwtBearer;
using Microsoft.IdentityModel.Tokens;
using System.Text;
using LD.Admin.Common;
using Microsoft.AspNetCore.SignalR;
using CommonHelper.AutoInject.Repository;

namespace LD.Admin.Api
{
    public class Startup
    {
        public Startup(IConfiguration configuration)
        {
            Configuration = configuration;
            //注册全局Configuration对象
            ConfigurationManager.Configure(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.AddControllers();
            services.AddSwaggerGen(c =>
            {
                c.SwaggerDoc("v1", new OpenApiInfo { Title = "XX后台管理服务接口", Version = "v1" });
                // 获取xml文件名
                var xmlFile = $"{Assembly.GetExecutingAssembly().GetName().Name}.xml";
                // 获取xml文件路径
                var xmlPath = Path.Combine(AppContext.BaseDirectory, xmlFile);
                // 添加控制器层注释，true表示显示控制器注释
                c.IncludeXmlComments(xmlPath, true);
                c.ResolveConflictingActions(apiDescriptions => apiDescriptions.First());
                c.DocumentFilter<HiddenApiFilter>();
            });
            services.Configure<TokenManagementModel>(Configuration.GetSection("JwtTokenConfig"));
            var token = Configuration.GetSection("JwtTokenConfig").Get<TokenManagementModel>();
            services.AddAuthentication(x =>
            {
                x.DefaultAuthenticateScheme = JwtBearerDefaults.AuthenticationScheme;
                x.DefaultChallengeScheme = JwtBearerDefaults.AuthenticationScheme;
            }).AddJwtBearer(x =>
            {
                x.RequireHttpsMetadata = false;
                x.SaveToken = true;
                x.TokenValidationParameters = new TokenValidationParameters
                {
                    ValidateIssuerSigningKey = true,
                    IssuerSigningKey = new SymmetricSecurityKey(Encoding.ASCII.GetBytes(token.Secret)),
                    ValidIssuer = token.Issuer,
                    ValidAudience = token.Audience,
                    ValidateIssuer = false,
                    ValidateAudience = false
                };
            });

            services.AddScoped<IAuthenticateService, TokenAuthenticationService>();
            services.AddSingleton<IHttpContextAccessor, HttpContextAccessor>();
            //services.AddSingleton<NotificationHub>();
            //services.AddSingleton<ChatHub>();
            //"LD.Admin.Repository"
            //RepositoryFactory.AutoRegisterService(string.Empty, "LD.Admin.Repository");
            //RegisterServiceIoc.Register(services);
            //services.AddAutoDi();
            //业务层服务自动注入
            services.AddAutoDiService("LD.Admin.Service");
            //services.AddAutoDiService("LD.Admin.Repository");
            //AutoFacFactory.AutoRegisterService("LD.Admin.Repository");
            //调用AutoRegisterService方法实现数据访问层服务自动注册
            RepositoryIocFactory.AutoRegisterService("LD.Admin.Repository");
            //添加对AutoMapper的支持，会查找所有程序集中继承了 Profile 的类
            // 配置AutoMapper
            services.AddAutoMapper(typeof(AutoMapperConfigs));
            services.AddAutoMapper(AppDomain.CurrentDomain.GetAssemblies());
            services.AddControllers();
            services.AddSignalR();

            //跨域
            var corsstring = Configuration.GetSection("Cors").Value;
            string[] corsarray = corsstring.Split(',');

            services.AddCors(options => options.AddPolicy("CorsPolicy",
            builder =>
            {
                builder.AllowAnyMethod().AllowAnyHeader()
                       .WithOrigins(corsarray)
                       .AllowCredentials();
            }));

            //var assbembly = AppDomain.CurrentDomain.GetAssemblies().ToList();
        }

        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
        {
            //注入请求。
            ServiceLocator.SetServices(app.ApplicationServices);
            //添加Swagger有关中间件
            app.UseSwagger();
            app.UseSwaggerUI(c =>
            {
                c.SwaggerEndpoint("/swagger/v1/swagger.json", "AdminAPI  v1");
                c.RoutePrefix = string.Empty;
                c.DocExpansion(DocExpansion.None);
            });

            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }
            
            app.UseHttpsRedirection();

            app.UseRouting();
            app.UseCors("CorsPolicy");
            //启用认证
            app.UseAuthentication();
            //启用授权
            app.UseAuthorization();
            //var httpContextAccessor = app.ApplicationServices.GetRequiredService<IHttpContextAccessor>();
            app.UseEndpoints(endpoints =>
            {
                endpoints.MapControllers();
            });
            var apiUrlConfig = Configuration.GetSection("ApiUrl").Value;
            app.UseEndpoints(endpoints =>
            {
                //endpoints.MapHub<ChatHub>("/chatHub");
                //endpoints.MapHub<ChatHub>("/chatHub").RequireCors(t => t.WithOrigins(new string[] { "http://localhost:8080" }).AllowAnyMethod().AllowAnyHeader().AllowCredentials());
                endpoints.MapHub<ChatHub>("/chatHub").RequireCors(t => t.WithOrigins(new string[] { apiUrlConfig }).AllowAnyMethod().AllowAnyHeader().AllowCredentials());
                //endpoints.MapHub<ChatHub>("/notifyHub").RequireCors(t => t.WithOrigins(new string[] { apiUrlConfig }).AllowAnyMethod().AllowAnyHeader().AllowCredentials());
                endpoints.MapControllers();
            });
        }
    }
}

服务层实现类的代码

/// <summary>
    /// 行业表 业务逻辑层接口 实现类
    /// </summary>
    [AutoInject(typeof(IIndustryService), InjectType.Scope)]
    public class IndustryService : BaseService<IIndustryRepository,int, IndustrySearchModel, IndustryModel>, IIndustryService
    {
        protected override IIndustryRepository Service
        {
            //get { return RepositoryFactory.Industry; }
            get { return RepositoryIocFactory.GetRegisterImp<IIndustryRepository>(); }
        }

        protected override string ClassName
        {
            get { return "IndustryService"; }
        }
    }

控制器层的使用

/// <summary>
    /// 行业接口
    /// </summary>
    public class IndustryController : BaseApiController
    {
        private IIndustryService _service;

        /// <summary>
        /// 
        /// </summary>
        /// <param name="service"></param>
        public IndustryController(IIndustryService service)
        {
            _service = service;
        }

        /// <summary>
        /// 获取分页列表
        /// </summary>
        /// <param name="model"></param>
        /// <returns></returns>
        [HttpPost, Route("getlistbypage")]
        public AjaxResultModel GetListByPage(IndustrySearchModel model)
        {
            var rspModel = new AjaxResultPageModel();
            try
            {
                model.ValidatePageSize();
                var pageModel = _service.GetListByPage(model, t => t.CreatedOn, OrderModeEnum.Desc);
                if (pageModel != null && pageModel.Models.Count > 0)
                {
                    rspModel.data = pageModel.Models;
                    rspModel.PageCount = pageModel.PageCount;
                    rspModel.RecordCount = pageModel.RecordCount;
                    rspModel.PageIndex = pageModel.PageIndex;
                }
                else
                {
                    rspModel.message = "未查到相关数据";
                }
                rspModel.success = true;
            }
            catch (System.Exception ex)
            {
                rspModel.Error(ex.Message);
            }
            return rspModel;
        }

        /// <summary>
        /// (详情)根据主键查询Model
        /// </summary>
        /// <param name="id">主键</param>
        /// <returns></returns>
        [HttpGet, Route("getmodelbyid")]
        public AjaxResultModel GetModelById(int id)
        {
            var rspModel = new AjaxResultModel();
            try
            {
                if (id > 0)
                {
                    var model = _service.GetModelById(id);
                    if (model != null)
                    {
                        rspModel.Success(model);
                    }
                    else
                    {
                        rspModel.Success(model, "ID不存在");
                    }
                }
                else
                {
                    rspModel.Warning("ID参数必传");
                }
            }
            catch (Exception ex)
            {
                //AddLogError(_className, "GetModelById", ex.Message, ex, id, id);
                rspModel.Error(ex.Message);
            }
            return rspModel;
        }
    }