Elvin Mammadov Elvin Mammadov - 1 month ago 12
C# Question

Implement dependency injection outside of Startup.cs

I want to implement dependency injection in ASP.NET CORE 1. I know everything is about DI in .Net Core. For example

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


But for Big projects which has more than 20 entities and Services, it is so difficult and unreadable writing all of these code lines inside ConfigureServices. I want to know Is this possible implement dependency injection outside of Startup.cs and then add it to services.

Thanks for answers.

Answer

you can write extension methods of IServiceCollection to encapsulate a lot of service registrations into 1 line of code in Startup.cs

for example here is one from my project:

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;
        }


    }
}

and in Startup.cs I call that method with one line of code

services.AddCloudscribeCore(Configuration);
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