The RootLogger sits at the root of the logger hierarchy tree.
For a list of all members of this type, see RootLogger Members.
        System.Object
        
   log4net.Repository.Hierarchy.Logger
      log4net.Repository.Hierarchy.RootLogger
This type is not safe for multithreaded operations.
The RootLogger is a regular Logger except that it provides several guarantees.
 First, it cannot be assigned a null level. Second, since the root logger cannot have a parent, the EffectiveLevel property always returns the value of the level field without walking the hierarchy. 
Namespace: log4net.Repository.Hierarchy
Assembly: log4net (in log4net.dll)
RootLogger Members | log4net.Repository.Hierarchy Namespace