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Editorial Team
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Asked: 2026-05-14T16:35:45+00:00

I’m using the Microsoft Logging Application Block (version 5 beta 2) and I’m trying

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I’m using the Microsoft Logging Application Block (version 5 beta 2) and I’m trying to dynamically set the file name of a log file to the year month and day (and then write a new log file every day). However, at runtime, the logger ignores any dynamic environment variables such as %date%, %time%, or %cd%. I can add static environment variables to the file name (such as %username%), but not dynamic environment variables. Does anyone know how to get the rolling flat file trace listener to dynamically set the date in the log file name?

(this is what I was setting the File Name as: Log_%date%.log)

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1 Answer

  1. Editorial Team

    I gave up on the Logging Application Block and switched to log4net. Log4net lets me set the name of the log to today’s date with a web.config setting. I wrote an article on Code Project that shows how to get log4net working with the Policy Injection Application Block here

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