log4net Azure Blob Appender - azure

Question

When saving logs into Azure Blob Storage, is there a way to create a different folder per day?
Right now I'm using this configuration, and it works fine
<appender name="AzureAppender2" type="log4net.Appender.AzureBlobAppender, log4net.Appender.Azure">
<param name="ContainerName" value="testcon" />
<param name="DirectoryName" value="myfolder/logs.txt" />
<param name="ConnectionString" value="DefaultEndpointsProtocol=https;AccountName=testcon;AccountKey="rftgdfgdfgfdg78=="/>
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date [%thread] %-5level %logger [%property{NDC}] - %message%newline" />
</layout>
</appender>
I've already tried this
<param name="DirectoryName" value=%date/" />
But it doesn't work
What I want is to be able to dynamically use different folders per day: something like
DirectoryName = 2016-05-13
DirectoryName = 2016-05-12
DirectoryName = 2016-05-11
Is this achievable?
Thanks

Answer 1

Here's the code for the appender on GitHub.
Here's the DirectoryName class property that maps from the configuration value:
private string _directoryName;
public string DirectoryName
{
get
{
if (String.IsNullOrEmpty(_directoryName))
throw new ApplicationException(Resources.DirectoryNameNotSpecified);
return _directoryName;
}
set
{
_directoryName = value;
}
}
And the relevant Filename method that actually creates the file name for the blob:
private static string Filename(LoggingEvent loggingEvent, string directoryName)
{
return string.Format("{0}/{1}.{2}.entry.log.xml",
directoryName,
loggingEvent.TimeStamp.ToString("yyyy_MM_dd_HH_mm_ss_fffffff",
DateTimeFormatInfo.InvariantInfo),
Guid.NewGuid().ToString().ToLower());
}
So it looks like directoryName only accepts static values. Good thing it's open source ...