asp.net core configuration配置读取

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"
}
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//在控制器注入Iconfiguration
  private 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;
        }
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2.读取嵌套节点

{
"info":{
 "name":"pxp",
 "age":"23",
 "sex":"男"
}
}
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//读取info里面的name
 var name = _configuration.GetSection("info：name");
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3.映射到实体

public class Info
{
public string name{get;set;}
public string age{get;set;}
public string sex{get;set;}
}
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var info= _configuration.GetSection("info");
string name= info.get<info>().name;
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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"));
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//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;
        }
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