file location not show

[Anda001]

did you find that if configure like this
<layout type="log4net.Layout.PatternLayout"> <param name="ConversionPattern" value="time：%d [%t] %n%level：%-5p %nlocation：%f:%l %nmsg：%m %n %n"/> </layout>

the location will print "[?]",not the right position.
2019-06-12 14:25:45,576 DEBUG GLog.? [?] - MESSAGE: end 2019-06-12 14:25:45,584 DEBUG GLog.? [?] - MESSAGE: end