What file name placeholders are available for Serilog?

Question

I use Serilog on a .NET Core application with RollingFile. I wonder, if there are different filename placeholders? I only know {Date}.

For example, I have code like

        Log.Logger = new LoggerConfiguration()
            .MinimumLevel.Information()
            .WriteTo.RollingFile("Logs/{Date}.log")
            .CreateLogger();

Are there any other options for the filename like {Date}? I'd like to have log files by hour.

Can a date based filename be configured in appsettings.json? — niico, Dec 02 '20 at 10:01

C. Augusto Proiete · Accepted Answer · 2018-06-04T14:19:25.007

15

At the time of this writing, Serilog's Rolling File sink supports 3 (three) specifiers:

{Date}, which is formatted as yyyyMMdd
{Hour}, which is formatted as yyyyMMddHH
{HalfHour}, which is formatted as yyyyMMddHHmm

You can see it in the README of the Rolling File sink, as well as in the source code of the Rolling File sink.

edited Jun 04 '18 at 14:19

answered Jun 07 '17 at 07:34

C. Augusto Proiete

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Thanks a lot. I just could not find any documentation. – Kim Jun 07 '17 at 10:19
1

It's in the README for the rolling file sink: https://github.com/serilog/serilog-sinks-rollingfile#filename-format-specifiers – Nicholas Blumhardt Jun 07 '17 at 21:33
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(We might need an index of READMEs somewhere :-)) – Nicholas Blumhardt Jun 07 '17 at 21:33
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Thanks again. Thumbs up for the index issue ;-) – Kim Jun 29 '17 at 19:10
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So with rolling file sink obsolete, is this possible with the file replacement? – reckface Dec 20 '19 at 10:13

Igor Beaufils · Answer 2 · 2022-08-03T09:36:02.657

UPDATE : 2022

Because "Serilog.Sinks.RollingFile" is obsolete now you should use "Serilog.Sinks.File" It's as easy though :

var log = new LoggerConfiguration()
    .WriteTo.File("log.txt", rollingInterval: RollingInterval.Day)
    .CreateLogger();

This will append the time period to the filename, creating a file set like:

log20180631.txt
log20180701.txt
log20180702.txt

For differentes choices :

https://github.com/serilog/serilog-sinks-file

score 0 · Answer 3 · answered Jun 29 '23 at 16:46

0

You can also add environment variables into the appsettings.json as %USERNAME%

answered Jun 29 '23 at 16:46

Ignore

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What file name placeholders are available for Serilog?

3 Answers3