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asp.net core 默认注入了configuration配置服务，configuration可以从命令行、环境变量、配置文件读取配置。
这边主要演示从appsettings.json文件读取配置
1.读取单节点配置

{
"name":"pxp"
}

//在控制器注入Iconfigurationprivate IConfiguration _configuration;public WeatherForecastController( IConfiguration configuration){_configuration = configuration;}[HttpGet(Name = "GetWeatherForecast")]public IEnumerable<WeatherForecast> Get(){var name = _configuration.GetSection("name");Console.WriteLine("读取配置：" + name );return null;}

2.读取嵌套节点

{
"info":{"name":"pxp","age":"23","sex":"男"
}
}

//读取info里面的namevar name = _configuration.GetSection("info：name");

3.映射到实体

public class Info
{
public string name{get;set;}
public string age{get;set;}
public string sex{get;set;}
}

var info= _configuration.GetSection("info");
string name= info.get<info>().name;

4.注入服务，映射到实体

 //在program中注入// 读取配置到实体类builder.Services.Configure<Info>(builder.Configuration.GetSection("Info"));

//使用Ioptions接口接收

private readonly IOptions<Info> _myConfig;
public WeatherForecastController(IOptions<Info> myConfigOptions){_myConfig = myConfigOptions;_configuration = configuration;}[HttpGet(Name = "GetWeatherForecast")]public IEnumerable<WeatherForecast> Get(){Console.WriteLine("读取配置：" + _myConfig.Value.name);return null;}