在.Net核心控制台应用程序中触发后台服务ExecuteAsync方法 [英] Trigger background service ExecuteAsync method in .Net core console application

问题描述

我正在 asp.net core 中创建控制台应用程序，它将在不同环境中作为后台服务运行.我使用了Microsoft.Extensions.Hosting"提供的BackgroundService"类.我想在我的程序启动时运行它的ExecuteAsync"方法.

I am creating console application in asp.net core which is going to run as background service in different environments. I have used "BackgroundService" class provided by "Microsoft.Extensions.Hosting". I want to run its "ExecuteAsync" method when my program gets started.

文件:Program.cs

File: Program.cs

public static void Main(string[] args)
        {
            var host = new HostBuilder()
                  .ConfigureHostConfiguration(configHost =>
                  {
                  })
                  .ConfigureServices((hostContext, services) =>
                  {
                      services.AddHostedService<IHostedService,RabbitLister>();

                  })
                 .UseConsoleLifetime()
                 .Build();


        }

文件:RabbitLister.cs

File: RabbitLister.cs

public class RabbitLister : BackgroundService
    {
        private readonly IEventBus _eventBus;
        private readonly ILogger<RabbitLister> _logger;

        public RabbitLister()
        {
        }

        public RabbitLister(IEventBus eventBus, ILogger<RabbitLister> logger)
        {
            _eventBus = eventBus;
            _logger = logger;
        }

        protected override Task ExecuteAsync(CancellationToken stoppingToken)
        {
            _eventBus.SubscribeDynamic("myQueue");
            return Task.CompletedTask;
        }
    }

推荐答案

宿主构建完成后，调用 host.Run()

After the host has been build, invoke host.Run()

public static void Main(string[] args) {
    var host = new HostBuilder()
          .ConfigureHostConfiguration(configHost => {
          })
          .ConfigureServices((hostContext, services) => {
              services.AddHostedService<IHostedService, RabbitLister>();
          })
         .UseConsoleLifetime()
         .Build();

    //run the host
    host.Run();
}

这将启动托管服务并最终调用执行函数

that will start hosted service and eventually call the execute function

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