无法在.NET核心Web API引用的.NET框架库中引用app.config

{
  "ConnectionStrings": {
    "DatabaseConnection": "Server=myServerAddress;Database=myDataBase;User Id=myUsername;Password=myPassword;"
  },
  "AppSettings": {
    "LogLevel": "Debug",
    "EnableLogging": true
  }
}

using Microsoft.Extensions.Configuration;

// 在Startup.cs文件的ConfigureServices方法中添加以下代码
public void ConfigureServices(IServiceCollection services)
{
    IConfiguration configuration = new ConfigurationBuilder()
        .SetBasePath(AppContext.BaseDirectory)
        .AddJsonFile("appsettings.json", optional: true, reloadOnChange: true)
        .Build();

    services.AddSingleton(configuration);
    // 其他配置和服务注册代码
}

using Microsoft.Extensions.Configuration;
using Microsoft.AspNetCore.Mvc;

[Route("api/[controller]")]
[ApiController]
public class MyController : ControllerBase
{
    private readonly IConfiguration _configuration;

    public MyController(IConfiguration configuration)
    {
        _configuration = configuration;
    }

    [HttpGet]
    public ActionResult<string> Get()
    {
        var connectionString = _configuration.GetConnectionString("DatabaseConnection");
        var logLevel = _configuration.GetValue<string>("AppSettings:LogLevel");
        var enableLogging = _configuration.GetValue<bool>("AppSettings:EnableLogging");

        // 使用配置值进行业务操作
        return Ok("Configuration values retrieved successfully.");
    }
}