Log cannot be recorded after log4net is deployed to the server

It can be recorded in the development environment , But not after the release . I have been troubled by this problem for a long time , Today, I finally found the reason ！！

my log4net The configuration file is written separately , It is saved in the root directory of the project .
The way to specify the configuration file is through AssemblyInfo.cs add to [assembly: log4net.Config.XmlConfigurator(ConfigFile = "log4net.config", Watch = true)] This code specifies .

Above is my project structure . I encapsulated one in the project LogHelper, call log4net Methods of are written in this class , This class is in the Common Under the project , Then other projects cite Common Under the LogHelper, So I only changed the quoted Common Project AssemblyInfo.cs file , And the correct way is to modify the main project AssemblyInfo.cs file ！！

ok …… After the change, it was OK ……OTL

PS： If you use the method of recording to file , You may need to give IIS_IUSRS User configured folder read and write permissions .