Custom LogEventLevel with Serilog

Question

I'm using Serilog and Seq with a .Net project. My main objective is to log some specific events. I would like to have my own log event level (like "Warning", "Verbose", "Information"...). But I don't really know if it's possible or not to have my custom log level for having this:

private static readonly ILogger Logger = Log.ForContext<MyController>();
        .
        .
        .
Logger.MyCustomLogLevel(....);

Is it possible?

Answer 1

Although custom levels are not possible, imagining you want to create (logically) and Important level you can achieve close to the same thing with:

static class LoggerExtensions
{
  public static void Important(
    this ILogger logger,
    string messageTemplate,
    params object[] args)
  {
    logger.ForContext("IsImportant", true)
      .Information(messageTemplate, args);
  }
}

Usage:

Logger.Important("Hello, {Name}!", "World");

In Seq:

IsImportant = true

Or:

select count(*) from stream where IsImportant limit 10