System.Configuration.BaseConfigurationRecord.MonitorStream C# (CSharp) Метод

        protected object MonitorStream(string configKey, string configSource, string streamname) {
            lock (this) {
                if (_flags[Closed]) {
                    return null;
                }

                StreamInfo streamInfo = (StreamInfo) ConfigStreamInfo.StreamInfos[streamname];
                if (streamInfo != null) {
                    if (streamInfo.SectionName != configKey) {
                        throw new ConfigurationErrorsException(SR.GetString(SR.Config_source_cannot_be_shared, streamname));
                    }

                    if (streamInfo.IsMonitored) {
                        return streamInfo.Version;
                    }
                }
                else {
                    streamInfo = new StreamInfo(configKey, configSource, streamname);
                    ConfigStreamInfo.StreamInfos.Add(streamname, streamInfo);
                }
            }

            //
            // Call the host outside the lock to avoid deadlock.
            //
            object version = Host.GetStreamVersion(streamname);

            StreamChangeCallback callbackDelegate = null;

            lock (this) {
                if (_flags[Closed]) {
                    return null;
                }

                StreamInfo streamInfo = (StreamInfo) ConfigStreamInfo.StreamInfos[streamname];
                if (streamInfo.IsMonitored) {
                    return streamInfo.Version;
                }

                streamInfo.IsMonitored = true;
                streamInfo.Version = version;

                if (_flags[SupportsChangeNotifications]) {
                    if (ConfigStreamInfo.CallbackDelegate == null) {
                        ConfigStreamInfo.CallbackDelegate = new StreamChangeCallback(this.OnStreamChanged);
                    }

                    callbackDelegate = ConfigStreamInfo.CallbackDelegate;
                }
            }

            if (_flags[SupportsChangeNotifications]) {
                Host.StartMonitoringStreamForChanges(streamname, callbackDelegate);
            }

            return version;
        }