.net core 中配置文件映射到类

1. 编写appsettings.json

{
    
  "Logging": {
    
    "LogLevel": {
    
      "Default": "Information",
      "Microsoft.AspNetCore": "Warning"
    }
  },
  "AllowedHosts": "*",
  "Custom": {
    
    "key": "123",
    "ser": "456"
  }
}

2. 编写映射类

namespace WebApplication1
{
    
    public class Config
    {
    
        public string key {
     get; set; }

        public string ser {
     get; set; }
    }
}

3. 注入配置

builder.Services.AddScoped<Config>();

builder.Services.Configure<Config>(
    builder.Configuration.GetSection("custom")
);

4. config的注入与使用

using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Options;

namespace WebApplication1.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;
        private readonly IOptionsSnapshot<Config> _config;

        public WeatherForecastController(ILogger<WeatherForecastController> logger, IOptionsSnapshot<Config> config)
        {
    
            _logger = logger;
            _config = config;
            var ss = _config.Value.key;
        }

        [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();
        }
    }
}