dotnet core 控制器调用IHostedService或者BackgroundService

        /// <summary>
        /// 日志组件
        /// </summary>
        private readonly ILogger<AppController> _logger;
        /// <summary>
        ///  后台
        /// </summary>
        private readonly Main.IContext _app;
        public AppController(ILogger<AppController> logger, Main.Context app)
        {
            _logger = logger;
            _app = app;
        }

        [HttpGet]
        public IActionResult Get()
        {
            DataDll.IConsole.Context.Error(_app.Name);
            return new JsonResult(new { A = _app.Name });
        }

    public class Context : IHostedService,IContext
    {
        private readonly ILogger<Context> _logger;

        private readonly MqttService.IContext _mqtt = new MqttService.Context();
        public Context(ILogger<Context> logger)
        {
            _logger = logger;


            Init();
        }

        /// <summary>
        /// 初始化
        /// </summary>
        private void Init()
        {
            _mqtt.Start();

            DataDll.IConsole.Context.Success(_mqtt.Option.User);
        }


        public string Name { get { return _mqtt.Option.User; } }

        public Task StartAsync(CancellationToken cancellationToken)
        {
            return Task.CompletedTask;
        }

        public Task StopAsync(CancellationToken cancellationToken)
        {
            return Task.CompletedTask;
        }
    }

//注入 后台                                                        
builder.Services.AddSingleton<Core.Jun.Next.Main.Context>();
// 独立运行后台
builder.Services.AddHostedService(service => service.GetRequiredService<Core.Jun.Next.Main.Context>());