serilog multiple instance per functionality

Question

While I have a general purpose logger for errors, exceptions etc that use rolling file sink to log stuff to my-{date}.log.

However, I need another instance for audit to audit-{date}.log and another instance to write perf info to perf-{date}.log.

How do I create multiple instances of serilog with different configuration or sink?

Interesting question, would Expression-based event filtering help? — Mark G
Take a look at Christo's answer stackoverflow.com/questions/51213779/… — John81

adem caglin adem caglin · Accepted Answer · 2018-07-24T18:34:24

You can do this like following:

        var loggerConfiguration = new LoggerConfiguration()
                       .MinimumLevel.Verbose()
                       .Enrich.FromLogContext();
        var fileBasePath = "<base log path>";
        loggerConfiguration
            .WriteTo.Console()
            .WriteTo.RollingFile(fileBasePath + "log-info-{Date}.txt")
            .WriteTo.Logger(fileLogger => fileLogger
                    .MinimumLevel.Error()
                    .WriteTo.RollingFile(fileBasePath + "log-error-{Date}.txt"))
            .WriteTo.Logger(fileLogger => fileLogger
                    .Filter.ByIncludingOnly(x =>
                          x.Level == LogEventLevel.Information &&
                          x.Properties.ContainsKey("<Audit Key>"))
                    .WriteTo.RollingFile(fileBasePath + "log-audit-{Date}.txt"));
        Log.Logger = loggerConfiguration.CreateLogger();

Note: Audit Key is a key which used in audit log

serilog multiple instance per functionality

2 Answers