How to reconfigure after AppSettings.json reloaded?

[ahdung]

I use loggerFactory.AddFile(AppSettings.Configuration.GetSection("Logging:Serilog")); in Startup.Configure, when appsettings.json file changed, i want update the settings of serilog.
I use ChangeToken.OnChange for response the changing:

ChangeToken.OnChange(() => AppSettings.Configuration.GetReloadToken(), env_ =>
{
    //how to reconfigure serilog?
}, env);