Log properties Event.Id is cause problem, I had to change line 255 to this string key = Convert.ToString(property.Key, CultureInfo.InvariantCulture).Replace('.', '_');

[MingLu8]

Log properties Event.Id is cause problem, I had to change line 255 to this string key = Convert.ToString(property.Key, CultureInfo.InvariantCulture).Replace('.', '_');

[304NotModified]

I think this is with NLog.Extensions.Logging?

You can also set the separater for Event.Id

loggerFactory.AddNLog(new NLogProviderOptions() { EventIdSeparator = "_"});

[snakefoot]

@pwelter34 Resolved with #22