.netcore中appsetting.json中配置取项

1.在服务层的类中获取依赖IConfiguration config，它会自动获得json内容

//appsetting.json
{"Wx": {"Appid": "wx1a1ddfe11f25528a"}
}
//WxService类的构造函数
private readonly string? m_wxAppid;
public WxService(IConfiguration config) {m_wxAppid = config["Wx:Appid"];
}

 2.在第一种方法的基础加一个类的映射

//新写的类
public class WxSettings
{public string Appid { get; set; }
}//Program.cs中注册依赖
builder.Services.Configure<WxSettings>(builder.Configuration.GetSection("Wx"));//要用的类中获得依赖
private readonly IOptions<WxSettings> _wxSettings;
public WxService(IOptions<WxSettings> wxSettings) {_wxSettings = wxSettings;
}