如何在 Net Core 6 worker 应用程序中使用配置？答案

【问题标题】：How can I use Configuration in Net Core 6 worker app?如何在 Net Core 6 worker 应用程序中使用配置？
【发布时间】：2022-01-04 02:21:28
【问题描述】：

有关使用配置的所有信息都从创建构建器开始

var builder = WebApplication.CreateBuilder(args);

随后使用

builder.Configuration.

配置，但在 Worker services WebApplication 不可用。

如何在 Microsoft.NET.Sdk.Worker 类型的项目中使用 Configuration？

【问题讨论】：

标签： .net-core configuration worker

【解决方案1】：

首先你应该在CreateHostBuilder的时候加上ConfigureAppConfiguration

public static IHostBuilder CreateHostBuilder(string[] args) =>
    Host.CreateDefaultBuilder(args)
        .ConfigureServices((hostContext, services) =>
        {
            services.AddHostedService<Worker>();
        })
        .ConfigureAppConfiguration((hostContext, configBuilder) =>
        {
            configBuilder
                .SetBasePath(Directory.GetCurrentDirectory())
                .AddJsonFile("appsettings.json")
                .AddJsonFile($"appsettings.{hostContext.HostingEnvironment.EnvironmentName}.json", optional: true, reloadOnChange: true)
                .Build();
        });

然后，在 appsettings 中添加配置。YourEnv.json

  "worker": {
    "id": 12345,
    "name": "SimpleWorker",
    "delay": 1000
  }

在Worker构造函数中添加IConfiguration并使用它。

Worker 类的完整示例：

public class Worker : BackgroundService
{
    private readonly ILogger<Worker> _logger;
    private readonly IConfiguration _configuration;

    public Worker(ILogger<Worker> logger, IConfiguration configuration)
    {
        _logger = logger;
        _configuration = configuration;
    }

    protected override async Task ExecuteAsync(CancellationToken stoppingToken)
    {
        var workerConfig = _configuration.GetSection("worker").Get<SimpleWorkerConfig>();
        while (!stoppingToken.IsCancellationRequested)
        {
            _logger.LogInformation("Worker {id}:{name} running at: {time} with delay {delay}", 
                workerConfig.Id, workerConfig.Name, DateTimeOffset.Now, workerConfig.Delay);
            await Task.Delay(workerConfig.Delay, stoppingToken);
        }
    }
}

public class SimpleWorkerConfig
{
    public int Id { get; set; }
    public string Name { get; set; }
    public int Delay { get; set; }
}

结果：

【讨论】：