System.Runtime.Serialization.XmlSerializableWriter.BeginWrite C# (CSharp) Method

        internal void BeginWrite(XmlWriter xmlWriter, object obj)
        {
            _depth = 0;
            _xmlWriter = xmlWriter;
            _obj = obj;
        }

        private static void WriteIXmlSerializable(XmlWriterDelegator xmlWriter, object obj, XmlSerializableWriter xmlSerializableWriter)
        {
            xmlSerializableWriter.BeginWrite(xmlWriter.Writer, obj);
            IXmlSerializable xmlSerializable = obj as IXmlSerializable;

            if (xmlSerializable != null)
            {
                xmlSerializable.WriteXml(xmlSerializableWriter);
            }
            else
            {
                XmlElement xmlElement = obj as XmlElement;
                if (xmlElement != null)
                {
                    xmlElement.WriteTo(xmlSerializableWriter);
                }
                else
                {
                    XmlNode[] xmlNodes = obj as XmlNode[];
                    if (xmlNodes != null)
                    {
                        foreach (XmlNode xmlNode in xmlNodes)
                        {
                            xmlNode.WriteTo(xmlSerializableWriter);
                        }
                    }
                    else
                    {
                        throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(XmlObjectSerializer.CreateSerializationException(SR.Format(SR.UnknownXmlType, DataContract.GetClrTypeFullName(obj.GetType()))));
                    }
                }
            }
            xmlSerializableWriter.EndWrite();
        }