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
csharp
{
"name":"pxp"
}
csharp
//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;
}
2.读取嵌套节点
csharp
{
"info":{
"name":"pxp",
"age":"23",
"sex":"男"
}
}
csharp
//读取info里面的name
var name = _configuration.GetSection("info:name");
3.映射到实体
csharp
public class Info
{
public string name{get;set;}
public string age{get;set;}
public string sex{get;set;}
}
csharp
var info= _configuration.GetSection("info");
string name= info.get<info>().name;
4.注入服务,映射到实体
csharp
//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
csharp
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;
}