public override void ActivateOptions()

in src/log4net/Appender/EventLogAppender.cs [278:345]
54 lines of code
10 McCabe index (conditional complexity)

		public override void ActivateOptions() 
		{
            try
            {
                base.ActivateOptions();

                if (m_securityContext == null)
                {
                    m_securityContext = SecurityContextProvider.DefaultProvider.CreateSecurityContext(this);
                }

                bool sourceAlreadyExists = false;
                string currentLogName = null;

                using (SecurityContext.Impersonate(this))
                {
                    sourceAlreadyExists = EventLog.SourceExists(m_applicationName);
                    if (sourceAlreadyExists) {
                        currentLogName = EventLog.LogNameFromSourceName(m_applicationName, m_machineName);
                    }
                }

                if (sourceAlreadyExists && currentLogName != m_logName)
                {
                    LogLog.Debug(declaringType, "Changing event source [" + m_applicationName + "] from log [" + currentLogName + "] to log [" + m_logName + "]");
                }
                else if (!sourceAlreadyExists)
                {
                    LogLog.Debug(declaringType, "Creating event source Source [" + m_applicationName + "] in log " + m_logName + "]");
                }

                string registeredLogName = null;

                using (SecurityContext.Impersonate(this))
                {
                    if (sourceAlreadyExists && currentLogName != m_logName)
                    {
                        //
                        // Re-register this to the current application if the user has changed
                        // the application / logfile association
                        //
                        EventLog.DeleteEventSource(m_applicationName, m_machineName);
                        CreateEventSource(m_applicationName, m_logName, m_machineName);

                        registeredLogName = EventLog.LogNameFromSourceName(m_applicationName, m_machineName);
                    }
                    else if (!sourceAlreadyExists)
                    {
                        CreateEventSource(m_applicationName, m_logName, m_machineName);

                        registeredLogName = EventLog.LogNameFromSourceName(m_applicationName, m_machineName);
                    }
                }

                m_levelMapping.ActivateOptions();

                LogLog.Debug(declaringType, "Source [" + m_applicationName + "] is registered to log [" + registeredLogName + "]");
            }
            catch (System.Security.SecurityException ex)
            {
                ErrorHandler.Error("Caught a SecurityException trying to access the EventLog.  Most likely the event source "
                    + m_applicationName
                    + " doesn't exist and must be created by a local administrator.  Will disable EventLogAppender."
                    + "  See http://logging.apache.org/log4net/release/faq.html#trouble-EventLog",
                    ex);
                Threshold = Level.Off;
            }
		}