Serilog RollingFile

Question

I am trying to use WriteTo.RollingFile with Serilog as the following:

var log = new LoggerConfiguration().WriteTo.RollingFile(
                    @\"F:\\log         


        

Answer 1

Try below:

 var log = new LoggerConfiguration()
          .MinimumLevel.Debug()
          .WriteTo.File(@"f:\log\log.txt", rollingInterval: RollingInterval.Day) 
          .CreateLogger();

The log file name will be automatically log-20150819.txt etc. You do not need to specify the date.Old files will be cleaned up as per retainedFileCountLimit - default is 31.

Answer 2

To enable multi-process shared log files, set shared to true:

in code

.WriteTo.RollingFile("log-{Date}.txt", shared: true)

or in web.config

<add key="serilog:write-to:RollingFile.shared" value="true" />

Answer 3

Here is a way to use Serilog with a web.config in an asp.net MVC 4/5 app.

In your web.config add the following:

<add key="serilog:minimum-level" value="Information" />
<add key="serilog:minimum-level:override:Microsoft" value="Information" />
<add key="serilog:minimum-level:override:System" value="Information" />
<add key="serilog:using:RollingFile" value="Serilog.Sinks.RollingFile" />
<add key="serilog:write-to:RollingFile.pathFormat" value="./Logs/log-{Date}.txt" />
<add key="serilog:write-to:RollingFile.outputTemplate" value="{Timestamp:yyyy-MM-dd HH:mm:ss.fff zzz} [{Level}] [{SourceContext}] {Message}{NewLine}{Exception}" />
<add key="serilog:write-to:RollingFile.retainedFileCountLimit" value="10" />

Then in Application_Start of global.asax add the following:

// Get application base directory
string basedir = AppDomain.CurrentDomain.BaseDirectory;

// Setup Serilog for logging
Log.Logger = new LoggerConfiguration()
            .ReadFrom.AppSettings()
            .WriteTo.RollingFile(basedir + "/Logs/log-{Date}.txt")
            .CreateLogger();

Answer 4

This is how I did it:

private readonly Serilog.ILogger _logger; //= Log.ForContext( "Name", "Weather" );

public WeatherForecastController() {
  string subPath = Path.Combine( DateTime.Now.ToString( "yyyy" ), DateTime.Now.ToString( "MM" ) ) + $"/{DateTime.Now.ToString("dd")}_Weather";
  _logger = Log.ForContext( "Name", subPath );
}

---

  .UseSerilog( ( hostingContext, loggerConfiguration ) => loggerConfiguration
    .ReadFrom.Configuration( hostingContext.Configuration )
    .Enrich.FromLogContext()
    .WriteTo.Console()
    .WriteTo.Map(
      "Name",
      "Request",
      ( name, wt ) => {
        if (name == "Request")
          wt.RollingFile( Path.Combine( $"{hostingContext.Configuration["LogPath"]}/{{Date}}-{name}.txt" ) );
        else
          wt.File( $"{hostingContext.Configuration["LogPath"]}/{name}.txt" );
      } )
  );   

Answer 5

To use the same file, you have to add shared: true

.WriteTo.RollingFile("log-{Date}.txt", shared: true)

Answer 6

Now in 2018, the standard Serilog.Sinks.File NuGet package supports rolling:

.WriteTo.File(@"e:\logs\skilliam.log", rollingInterval: RollingInterval.Day,
    rollOnFileSizeLimit: true, fileSizeLimitBytes: 123456);