如果采用自帶容器，因為此時我們的IEmailService有多個實現(xiàn)類，因此需要注入IServiceProvider，然后通過IServiceProvider的GetServices復數(shù)版本來獲取多個服務，此時可以順序調用多個實現(xiàn)服務，如果需要區(qū)別其中的某一個服務，可以通過type加以區(qū)分。

[Route("api/[controller]")]
		[ApiController]
		public class ValuesController : ControllerBase
		{
			private readonly IEnumerable<IEmailService> emailService;
			private readonly ILogger<ValuesController> logger;
			/// <summary>
			/// 注入IServiceProvider獲取服務
			/// </summary>
			/// <param name="serviceProvider"></param>
			/// <param name="logger"></param>
			public ValuesController(IServiceProvider serviceProvider, ILogger<ValuesController> logger)
			{
				var service = serviceProvider.GetServices<IEmailService>(); //獲取服務
				this.emailService = service;
				this.logger = logger;
			}
			[HttpGet]
			public IActionResult Send(string email)
				//可以遍歷服務
				foreach (var emailService in emailService)
				{
					if(emailService.GetType() == typeof(First_EmailService))
					{ 
						//控制臺輸出調用日志
						logger.LogInformation(emailService.Send(email));
					}
				}
				return Ok();
		}

2、AutoFac中的實現(xiàn)

如果需要在Autofac中解析不同的服務，需要用到Named實現(xiàn)。首先，需要獲取Autofac的容器，即IContainer實例。獲取的位置有兩種：

（1）在ConfigureContainer中的注冊模塊類中進行獲取，相關代碼如下：

public class ConfigureAutofac : Autofac.Module
		{
			private static IContainer _container;
			protected override void Load(ContainerBuilder containerBuilder)
			{
				//注冊兩個不同命名的服務
				containerBuilder.RegisterType<EmailService>().Named<IEmailService>("one");
				containerBuilder.RegisterType<MyEmailService>().Named<IEmailService>("two");
				//需要在回調用獲取容器
				containerBuilder.RegisterBuildCallback(container =>
				{
					_container = (IContainer)container;
					var one =  _container.ResolveNamed<IEmailService>("two");
					one.Send("one");
				});
			}
		}

（2）上述服務是Autofac的模塊配置中實現(xiàn)，也可以在Startup中實現(xiàn)，需要調用Autofac的GetAutofacRoot方法

/// <summary>
			/// ConfigureServices將默認的容器注入進去，Autofac會接替默認的，然后執(zhí)行ConfigureContainer
			/// </summary>
			/// <param name="builder"></param>
			public void ConfigureContainer(ContainerBuilder builder)
			{
				builder.RegisterType<MyService>().As<IMyService>();
			}
	 
			//注冊根容器
			public ILifetimeScope AutofacContainer { get; private set; }
			public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
				this.AutofacContainer = app.ApplicationServices.GetAutofacRoot();
				var serviceName = this.AutofacContainer.Resolve<IMyService>();
				serviceName.ShowCode();
				//...

（3）如果需要在控制器中實現(xiàn)不同名稱的服務調用，則需要在控制器中注入IApplicationBuilder接口，但直接注入會報未解析服務的錯誤，需要手動在ConfigureServices中配置一下

services.AddSingleton&lt;IApplicationBuilder, ApplicationBuilder&gt;();

之后就可以在控制器中正常注入了

[Route("api/[controller]")]
		[ApiController]
		public class ValuesController : ControllerBase
		{
			private readonly IApplicationBuilder app;
			private readonly ILogger<ValuesController> logger;
			public ILifetimeScope AutofacContainer { get; private set; }
			public ValuesController(IApplicationBuilder app, ILogger<ValuesController> logger)
			{
				this.app = app;
				this.logger = logger;
			}
			[HttpGet]
			public IActionResult Send(string email)
				this.AutofacContainer = app.ApplicationServices.GetAutofacRoot();
				var serviceName = this.AutofacContainer.ResolveNamed<IEmailService>("one");
				logger.LogInformation(serviceName.Send(string.Empty));
				return Ok();
		}

參考：https://blog.csdn.net/hahahzzzzz/article/details/118684998

到此這篇關于asp.net Core中的同名服務注冊的文章就介紹到這了,更多相關asp.net Core服務注冊內容請搜索腳本之家以前的文章或繼續(xù)瀏覽下面的相關文章希望大家以后多多支持腳本之家！

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