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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