本文共 10681 字，大约阅读时间需要 35 分钟。

1.基本的使用

public class Sample01{
       public class SystemClock : IHostedService    {
           private Timer _timer;        public Task StartAsync(CancellationToken cancellationToken)        {
               _timer = new Timer(state =>            {
                   Console.WriteLine($"Current Time:{DateTime.Now.ToLongTimeString()}");            }, null,0, 1000);            return Task.CompletedTask;        }        public Task StopAsync(CancellationToken cancellationToken)        {
               _timer?.Dispose();            return Task.CompletedTask;        }    }    public static void Start()    {
           var host = new HostBuilder()            .ConfigureServices(collection => collection                .AddSingleton
   
    ())                .Build();        host.Run();    }}
   

2.依赖注入服务

public class Sample02{
       /// 
    /// 温度    /// 
    public interface ITemperatureCollector    {
           int Get();    }    /// 
    /// 湿度    /// 
    public interface IHumidityCollector    {
           int Get();    }    /// 
    /// 空气质量    /// 
    public interface IAirQualityCollector    {
           int Get();    }    public class Collector: ITemperatureCollector, IHumidityCollector, IAirQualityCollector    {
           int ITemperatureCollector.Get()        {
               var random = new Random();            return random.Next(0, 100);        }        int IHumidityCollector.Get()        {
               var random = new Random();            return random.Next(0, 100);        }        int IAirQualityCollector.Get()        {
               var random = new Random();            return random.Next(0, 100);        }    }    public class AirEnvironmentService : IHostedService    {
           private readonly ITemperatureCollector _temperatureCollector;        private readonly IHumidityCollector _humidityCollector;        private readonly IAirQualityCollector _airQualityCollector;        private Timer _timer;        public AirEnvironmentService(            ITemperatureCollector temperatureCollector,            IHumidityCollector humidityCollector,            IAirQualityCollector airQualityCollector        )        {
               _temperatureCollector = temperatureCollector;            _humidityCollector = humidityCollector;            _airQualityCollector = airQualityCollector;        }        public Task StartAsync(CancellationToken cancellationToken)        {
               _timer = new Timer(state =>            {
                   Console.WriteLine($"温度：{_temperatureCollector.Get(), -10}" +                                  $"湿度：{_humidityCollector.Get(), -10}" +                                  $"空气质量：{_airQualityCollector.Get(), -10}" +                                  $"时间:{DateTime.Now.ToLongTimeString()}");            }, null,0, 1000);            return Task.CompletedTask;        }        public Task StopAsync(CancellationToken cancellationToken)        {
               _timer?.Dispose();            return Task.CompletedTask;        }    }    public static void Start()    {
           var collector = new Collector();        var host = new HostBuilder()            .ConfigureServices(collection => collection                .AddSingleton
   
    (collector)                .AddSingleton
    
     (collector)                .AddSingleton
     
      (collector)                .AddHostedService
      
       ()            ).Build();        host.Run();    }}
      
     
    
   

3.环境变量的读取

public class Sample03{
       /// 
    /// 温度    /// 
    public interface ITemperatureCollector    {
           int Get();    }    /// 
    /// 湿度    /// 
    public interface IHumidityCollector    {
           int Get();    }    /// 
    /// 空气质量    /// 
    public interface IAirQualityCollector    {
           int Get();    }    public class Collector: ITemperatureCollector, IHumidityCollector, IAirQualityCollector    {
           int ITemperatureCollector.Get()        {
               var random = new Random();            return random.Next(0, 100);        }        int IHumidityCollector.Get()        {
               var random = new Random();            return random.Next(0, 100);        }        int IAirQualityCollector.Get()        {
               var random = new Random();            return random.Next(0, 100);        }    }    public class AirEnvironmentOptions    {
           public long Interval {
    get; set; }    }    public class AirEnvironmentService : IHostedService    {
           private readonly ITemperatureCollector _temperatureCollector;        private readonly IHumidityCollector _humidityCollector;        private readonly IAirQualityCollector _airQualityCollector;        private readonly AirEnvironmentOptions _options;        private Timer _timer;        public AirEnvironmentService(            ITemperatureCollector temperatureCollector,            IHumidityCollector humidityCollector,            IAirQualityCollector airQualityCollector,            IOptions
   
     options        )        {
               _temperatureCollector = temperatureCollector;            _humidityCollector = humidityCollector;            _airQualityCollector = airQualityCollector;            _options = options.Value;        }        public Task StartAsync(CancellationToken cancellationToken)        {
               _timer = new Timer(state =>            {
                   Console.WriteLine($"温度：{_temperatureCollector.Get(), -10}" +                                  $"湿度：{_humidityCollector.Get(), -10}" +                                  $"空气质量：{_airQualityCollector.Get(), -10}" +                                  $"时间:{DateTime.Now.ToLongTimeString()}");            }, null,0, _options.Interval);            return Task.CompletedTask;        }        public Task StopAsync(CancellationToken cancellationToken)        {
               _timer?.Dispose();            return Task.CompletedTask;        }    }    public static void Start(string[] args)    {
           var collector = new Collector();        var host = new HostBuilder()            .ConfigureHostConfiguration(builder => builder.AddCommandLine(args))            .ConfigureAppConfiguration((context, builder) => builder                .AddJsonFile("appsettings.json", false)                .AddJsonFile($"appsettings.{context.HostingEnvironment.EnvironmentName}.json",true)            )            .ConfigureServices((context, collection) => collection                .AddSingleton
    
     (collector)                .AddSingleton
     
      (collector)                .AddSingleton
      
       (collector)                .AddHostedService
       
        ()                .AddOptions()                .Configure
        
         ( context.Configuration.GetSection("AirEnvironment")) ).Build(); host.Run(); }}
        
       
      
     
    
   

4.使用日志记录服务

public class Sample04{
       /// 
    /// 温度    /// 
    public interface ITemperatureCollector    {
           int Get();    }    /// 
    /// 湿度    /// 
    public interface IHumidityCollector    {
           int Get();    }    /// 
    /// 空气质量    /// 
    public interface IAirQualityCollector    {
           int Get();    }    public class Collector: ITemperatureCollector, IHumidityCollector, IAirQualityCollector    {
           int ITemperatureCollector.Get()        {
               var random = new Random();            return random.Next(0, 100);        }        int IHumidityCollector.Get()        {
               var random = new Random();            return random.Next(0, 100);        }        int IAirQualityCollector.Get()        {
               var random = new Random();            return random.Next(0, 100);        }    }    public class AirEnvironmentOptions    {
           public long Interval {
    get; set; }    }    public class AirEnvironmentPublisher    {
           private const string Template = "温度：{temperature, -10}" +                                         "湿度：{humidity, -10}" +                                         "空气质量：{airQuality, -10}" +                                         "时间:{now}";        private readonly Action
   
     _logAction;        private readonly ILogger _logger;        public AirEnvironmentPublisher(ILogger
    
      logger)        {
               _logger = logger;            _logAction = LoggerMessage.Define
     
      (LogLevel.Information, 0, Template);        }        public void Publish(int temp, int humi, int airq)        {
               _logAction(_logger, temp, humi, airq, DateTime.Now.ToLongTimeString(), null);        }    }    public class AirEnvironmentService : IHostedService    {
           private readonly ITemperatureCollector _temperatureCollector;        private readonly IHumidityCollector _humidityCollector;        private readonly IAirQualityCollector _airQualityCollector;        private readonly AirEnvironmentPublisher _publisher;        private readonly AirEnvironmentOptions _options;        private Timer _timer;        public AirEnvironmentService(            ITemperatureCollector temperatureCollector,            IHumidityCollector humidityCollector,            IAirQualityCollector airQualityCollector,            AirEnvironmentPublisher publisher,            IOptions
      
        options        )        {
               _temperatureCollector = temperatureCollector;            _humidityCollector = humidityCollector;            _airQualityCollector = airQualityCollector;            _publisher = publisher;            _options = options.Value;        }        public Task StartAsync(CancellationToken cancellationToken)        {
               _timer = new Timer(state =>            {
                   _publisher.Publish(                    _temperatureCollector.Get(),                    _humidityCollector.Get(),                     _airQualityCollector.Get());            }, null,0, _options.Interval);            return Task.CompletedTask;        }        public Task StopAsync(CancellationToken cancellationToken)        {
               _timer?.Dispose();            return Task.CompletedTask;        }    }    public static void Start()    {
           var collector = new Collector();        var host = new HostBuilder()            .ConfigureAppConfiguration((context,builder) => builder.AddJsonFile("appsettings.json"))            .ConfigureServices((context, collection) => collection                .AddSingleton
       
        (collector)                .AddSingleton
        
         (collector) .AddSingleton
         
          (collector) .AddSingleton
          
           () .AddHostedService
           
            () .AddOptions() .Configure
            
             ( context.Configuration.GetSection("AirEnvironment")) ) .ConfigureLogging((context, builder) => builder .AddConfiguration(context.Configuration.GetSection("Logging")) .AddConsole()) .Build(); host.Run(); }}
            
           
          
         
        
       
      
     
    
   

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