asp.net 托管服务 后台任务 定时器任务

托管服务1\1.txt

this is a test file 

托管服务1\appsettings.Development.json

{
  "Logging": {
    "LogLevel": {
      "Default": "Information",
      "Microsoft.AspNetCore": "Warning"
    }
  }
}

托管服务1\appsettings.json

{
  "Logging": {
    "LogLevel": {
      "Default": "Information",
      "Microsoft.AspNetCore": "Warning"
    }
  },
  "AllowedHosts": "*"
}

托管服务1\DemoBgService.cs


public class DemoBgService : BackgroundService
{
	private ILogger<DemoBgService> logger;
	private Timer? timer; // 定义一个定时器字段

	public DemoBgService(ILogger<DemoBgService> logger)
	{
		this.logger = logger;
	}

	protected override async Task ExecuteAsync(CancellationToken stoppingToken)
	{
		// 创建一个定时器，指定回调方法，延迟 5 秒开始，每隔 2 秒执行一次
		timer = new Timer(ReadFile!, null, 5000, 2000);
	}

	// 定义一个回调方法，用于读取文件并记录日志
	private async void ReadFile(object state)
	{
		logger.LogInformation($"{DateTime.Now}");
	}

	public override void Dispose()
	{
		base.Dispose();
		// 释放定时器资源
		timer.Dispose();
	}

}

托管服务1\Program.cs

var builder = WebApplication.CreateBuilder(args);

builder.Services.AddControllers();

builder.Services.AddEndpointsApiExplorer();
builder.Services.AddSwaggerGen();
builder.Services.AddHostedService<DemoBgService>();


var app = builder.Build();

if (app.Environment.IsDevelopment())
{
    app.UseSwagger();
    app.UseSwaggerUI();
}

app.UseHttpsRedirection();

app.UseAuthorization();

app.MapControllers();

app.Run();

托管服务1\WeatherForecast.cs

namespace 托管服务1
{
    public class WeatherForecast
    {
        public DateTime Date { get; set; }

        public int TemperatureC { get; set; }

        public int TemperatureF => 32 + (int)(TemperatureC / 0.5556);

        public string? Summary { get; set; }
    }
}

托管服务1\托管服务1.csproj

<Project Sdk="Microsoft.NET.Sdk.Web">

  <PropertyGroup>
    <TargetFramework>net6.0</TargetFramework>
    <Nullable>enable</Nullable>
    <ImplicitUsings>enable</ImplicitUsings>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="Swashbuckle.AspNetCore" Version="6.2.3" />
  </ItemGroup>

</Project>

托管服务1\Controllers\WeatherForecastController.cs

using Microsoft.AspNetCore.Mvc;

namespace 托管服务1.Controllers
{
    [ApiController]
    [Route("[controller]")]
    public class WeatherForecastController : ControllerBase
    {
        private static readonly string[] Summaries = new[]
        {
        "Freezing", "Bracing", "Chilly", "Cool", "Mild", "Warm", "Balmy", "Hot", "Sweltering", "Scorching"
    };

        private readonly ILogger<WeatherForecastController> _logger;

        public WeatherForecastController(ILogger<WeatherForecastController> logger)
        {
            _logger = logger;
        }

        [HttpGet(Name = "GetWeatherForecast")]
        public IEnumerable<WeatherForecast> Get()
        {
            return Enumerable.Range(1, 5).Select(index => new WeatherForecast
            {
                Date = DateTime.Now.AddDays(index),
                TemperatureC = Random.Shared.Next(-20, 55),
                Summary = Summaries[Random.Shared.Next(Summaries.Length)]
            })
            .ToArray();
        }
    }
}