目录

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Iconfiguration  private IConfiguration _configuration;  public WeatherForecastController( IConfiguration configuration)        {            _configuration = configuration;        }       [HttpGet(Name = "GetWeatherForecast")]        public IEnumerable 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name var 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().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(builder.Configuration.GetSection("Info"));

//使用Ioptions接口接收

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

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