BExIS.IO.DataType.DisplayPattern.DataTypeDisplayPattern.Materialize C# (CSharp) Метод

        public static DataTypeDisplayPattern Materialize(XmlNode extra)
        {
            if (extra != null)
            {
                XmlDocument xmlDoc = extra as XmlDocument;
                XmlNode xmlNode;

                DataTypeDisplayPattern displayPattern = new DataTypeDisplayPattern();
                if (xmlDoc.GetElementsByTagName("DisplayPattern").Count > 0)
                {
                    xmlNode = XmlUtility.GetXmlNodeByName(xmlDoc.GetElementsByTagName("DisplayPattern").Item(0), "Systemtype");
                    if (xmlNode != null)
                    {
                        foreach (DataTypeCode dtc in Enum.GetValues(typeof(DataTypeCode)))
                        {
                            if (dtc.ToString() == xmlNode.InnerText)
                            {
                                displayPattern.Systemtype = dtc;
                                break;
                            }
                        }
                    }
                    else
                    {
                        return null;
                    }
                    xmlNode = XmlUtility.GetXmlNodeByName(xmlDoc.GetElementsByTagName("DisplayPattern").Item(0), "Name");
                    if(xmlNode != null && xmlNode.InnerText != "null")
                        displayPattern.Name = xmlNode.InnerText;
                    else
                        displayPattern.Name = null;
                    xmlNode = XmlUtility.GetXmlNodeByName(xmlDoc.GetElementsByTagName("DisplayPattern").Item(0), "StringPattern");
                    if (xmlNode != null && xmlNode.InnerText != "null")
                        displayPattern.StringPattern = xmlNode.InnerText;
                    else
                        displayPattern.StringPattern = null;
                    xmlNode = XmlUtility.GetXmlNodeByName(xmlDoc.GetElementsByTagName("RegexPattern").Item(0), "RegexPattern");
                    if (xmlNode != null && xmlNode.InnerText != "null")
                        displayPattern.RegexPattern = xmlNode.InnerText;
                    else
                        displayPattern.RegexPattern = null;
                    return displayPattern;
                }
            }
            return null;
        }