Ian Chen

環境

• ASP.NET 5
• NLog.Web.AspNetCore 4.14.0

appsettings.json

{
  "AppName": "Test",
  "AppSettings": {
    "User": "Name"
  }
}

Program

透過 LogManager 讀取 appsettings.json

public static void Main(string[] args)
{
    var logger = LogManager.Setup().LoadConfigurationFromAppSettings().GetCurrentClassLogger();
    try
    {
        CreateHostBuilder(args).Build().Run();
    }
    catch (Exception exception)
    {
        logger.Error(exception, "Stopped program because of exception");
        throw;
    }
    finally
    {
        LogManager.Shutdown();
    }
}

NLog.config

只需要改用 configsetting 即可

1. 取得第一層的參數 AppName: ${configsetting:name=AppName}
2. 取得 AppSettings 內的 User: ${configsetting:name=AppSettings.User}
3. 嘗試取得，否則拿 default 值: ${configsetting:name=Test:default=123}

參考資料

NLog GitHub