Serilog : Log to different files

问题

I am logging events of all types to single Json file irrespective of LogLevel. Now I have a requirement to log some custom performance counters to a seperate Json file. How can this be done in Serilog. Should I create different Logger Instance and use that where ever I am going to Log the performance counters? Want to use this with LibLog

回答1:

You can do this by first making sure the performance counter events are tagged with either a particular property value (OpenMappedContext() in LibLog) or from a particular type/namespace.

var log = LogProvider.For<MyApp.Performance.SomeCounter>()
log.Info(...);

When configuring Serilog, a sub-logger with filter applied can send just the required events to the second file.

Log.Logger = new LoggerConfiguration()
    .WriteTo.Logger(lc => lc
        .Filter.ByExcluding(Matching.FromSource("MyApp.Performance"))
        .WriteTo.File("first.json", new JsonFormatter()))
    .WriteTo.Logger(lc => lc
        .Filter.ByIncludingOnly(Matching.FromSource("MyApp.Performance"))
        .WriteTo.File("second.json", new JsonFormatter()))
    .CreateLogger();

回答2:

If you want to have an independent logging pipeline, just make another instance. This is robbed and adapted from https://github.com/serilog/serilog/wiki/Lifecycle-of-Loggers:

using (var performanceCounters = new LoggerConfiguration()
        .WriteTo.File(@"myapp\log.txt")
        .CreateLogger())
{
    performanceCounters.Information("Performance is really good today ;-)");

    // Your app runs, then disposal of `performanceCounters` flushes any buffers
}

来源：https://stackoverflow.com/questions/38481227/serilog-log-to-different-files

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serilog