c# - 在 Startup.cs 之外实现依赖注入(inject)

Question

我想在 ASP.NET CORE 1 中实现依赖注入(inject)。我知道 .Net Core 中的一切都是关于 DI 的。例如

   public void ConfigureServices(IServiceCollection services)
   {
      // Add application services.
     services.AddTransient<IDateTime, SystemDateTime>();
   }

但是对于拥有超过 20 个实体和服务的大项目来说，在 ConfigureServices 中编写所有这些代码行是非常困难和不可读的。我想知道这是否可能在 Startup.cs 之外实现依赖注入(inject)，然后将其添加到服务中。

感谢您的回答。

Answer 1

可以写IServiceCollection的扩展方法，把很多服务注册封装到Startup.cs里一行代码

例如这是我项目中的一个:

using cloudscribe.Core.Models;
using cloudscribe.Core.Models.Setup;
using cloudscribe.Core.Web;
using cloudscribe.Core.Web.Components;
using cloudscribe.Core.Web.Components.Editor;
using cloudscribe.Core.Web.Components.Messaging;
using cloudscribe.Core.Web.Navigation;
using cloudscribe.Web.Common.Razor;
using cloudscribe.Web.Navigation;
using cloudscribe.Web.Navigation.Caching;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc.Razor;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection.Extensions;
using Microsoft.Extensions.FileProviders;
using Microsoft.Extensions.Options;
using System.Reflection;
using Microsoft.AspNetCore.Authorization;

namespace Microsoft.Extensions.DependencyInjection
{
    public static class StartupExtensions
    {
        public static IServiceCollection AddCloudscribeCore(this IServiceCollection services, IConfigurationRoot configuration)
        {
            services.TryAddSingleton<IHttpContextAccessor, HttpContextAccessor>();
            services.Configure<MultiTenantOptions>(configuration.GetSection("MultiTenantOptions"));
            services.Configure<SiteConfigOptions>(configuration.GetSection("SiteConfigOptions"));
            services.Configure<UIOptions>(configuration.GetSection("UIOptions"));
            services.Configure<CkeditorOptions>(configuration.GetSection("CkeditorOptions"));
            services.Configure<CachingSiteResolverOptions>(configuration.GetSection("CachingSiteResolverOptions"));
            services.AddMultitenancy<SiteContext, CachingSiteResolver>();
            services.AddScoped<CacheHelper, CacheHelper>();
            services.AddScoped<SiteManager, SiteManager>();
            services.AddScoped<GeoDataManager, GeoDataManager>();
            services.AddScoped<SystemInfoManager, SystemInfoManager>();
            services.AddScoped<IpAddressTracker, IpAddressTracker>();
            services.AddScoped<SiteDataProtector>();
            services.AddCloudscribeCommmon();
            services.AddScoped<ITimeZoneIdResolver, RequestTimeZoneIdResolver>();
            services.AddCloudscribePagination();
            services.AddScoped<IVersionProviderFactory, VersionProviderFactory>();
            services.AddScoped<IVersionProvider, CloudscribeCoreVersionProvider>();
            services.AddTransient<ISiteMessageEmailSender, SiteEmailMessageSender>();
            services.AddTransient<ISmsSender, SiteSmsSender>();
            services.AddSingleton<IThemeListBuilder, SiteThemeListBuilder>();
            services.TryAddScoped<ViewRenderer, ViewRenderer>();
            services.AddSingleton<IOptions<NavigationOptions>, SiteNavigationOptionsResolver>();
            services.AddScoped<ITreeCacheKeyResolver, SiteNavigationCacheKeyResolver>();
            services.AddScoped<INodeUrlPrefixProvider, FolderTenantNodeUrlPrefixProvider>();
            services.AddCloudscribeNavigation(configuration);

            services.AddCloudscribeIdentity();

            return services;
        }


    }
}

在 Startup.cs 中，我用一行代码调用该方法

services.AddCloudscribeCore(Configuration);