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

        private ConfigXmlReader FindSection(string [] keys, SectionXmlInfo sectionXmlInfo, out int lineNumber) {
            lineNumber = 0;
            ConfigXmlReader section = null;
            try {
                using (Impersonate()) {
                    using (Stream stream = Host.OpenStreamForRead(sectionXmlInfo.Filename)) {
                        if (       !_flags[SupportsRefresh] 
                                && (stream == null || HasStreamChanged(sectionXmlInfo.Filename, sectionXmlInfo.StreamVersion))) {

                            throw new ConfigurationErrorsException(SR.GetString(SR.Config_file_has_changed), sectionXmlInfo.Filename, 0);
                        }

                        if (stream != null) {
                            using (XmlUtil xmlUtil = new XmlUtil(stream, sectionXmlInfo.Filename, true)) {
                                if (sectionXmlInfo.SubPath == null) {
                                    section = FindSectionRecursive(keys, 0, xmlUtil, ref lineNumber);
                                }
                                else {
                                    // search children of <configuration> for <location>
                                    xmlUtil.ReadToNextElement();
                                    while (xmlUtil.Reader.Depth > 0) {
                                        if (xmlUtil.Reader.Name == KEYWORD_LOCATION) {
                                            bool   locationValid = false;
                                            string locationSubPathAttribute = xmlUtil.Reader.GetAttribute(KEYWORD_LOCATION_PATH);

                                            try {
                                                locationSubPathAttribute = NormalizeLocationSubPath(locationSubPathAttribute, xmlUtil);
                                                locationValid = true;
                                            }
                                            catch (ConfigurationException ce) {
                                                xmlUtil.SchemaErrors.AddError(ce, ExceptionAction.NonSpecific);
                                            }

                                            if (locationValid &&
                                                 StringUtil.EqualsIgnoreCase(sectionXmlInfo.SubPath, locationSubPathAttribute)) {

                                                section = FindSectionRecursive(keys, 0, xmlUtil, ref lineNumber);
                                                if (section != null)
                                                    break;
                                            }
                                        }

                                        xmlUtil.SkipToNextElement();
                                    }
                                }

                                // Throw accumulated errors
                                ThrowIfParseErrors(xmlUtil.SchemaErrors);
                            }
                        }
                    }
                }
            }
            // Don't allow frames up the stack to run exception filters while impersonated.
            catch {
                throw;
            }


            return section;
        }