log4net using ThreadContext.Properties in wcf PerSession service

Question

I would like to use the following in my wcf service to log the user in the log message:

log4net.ThreadContext.Properties[\"user\"] = this.currentUser.Login         


        

Answer 1

I ran into the same problem and this is how I got it to work. You can use GlobalContext since it will be evaluated for each call anyway.

[ServiceBehavior(InstanceContextMode = InstanceContextMode.PerSession)]
public class MyService : IMyService
{
    //static constructor
    static MyService()
    {
        log4net.Config.XmlConfigurator.Configure();
        log4net.GlobalContext.Properties["user"] = new UserLogHelper();
    }
    ...
}

Then you have to define a simple class:

private class UserLogHelper
{
    public override string ToString()
    {
        var instanceContext = OperationContext.Current.InstanceContext;
        var myServiceInstance = instanceContext.GetServiceInstance() as MyService;
        return myServiceInstance?.currentUser?.LoginName;
   }
}