namespace XMLElement和XMLNode{    class Program    {        static void Main(string[] args)        {            XmlDocument doc = new XmlDocument();            XmlDeclaration dec = doc.CreateXmlDeclaration("1.0", "GB2312", null);            doc.AppendChild(dec);            #region ok            //创建一个根节点（一级）            //XmlElement root = doc.CreateElement("First");            //doc.AppendChild(root);            ////创建节点（二级）            //XmlNode node = doc.CreateElement("Seconde");            ////创建节点（三级）            //XmlElement element1 = doc.CreateElement("Third1");            //element1.SetAttribute("Name", "Sam");            //element1.SetAttribute("ID", "665");            //element1.InnerText = "Sam Comment";            //node.AppendChild(element1);            //XmlElement element2 = doc.CreateElement("Third2");            //element2.SetAttribute("Name", "Round");            //element2.SetAttribute("ID", "678");            //element2.InnerText = "Round Comment";            //node.AppendChild(element2);            // root.AppendChild(node);             #endregion            #region ojbk2            //XmlElement root = doc.CreateElement("siiscmd");            ////root.SetAttribute("xmlns", "zkb");//如果不给Element加Attribute就会是一个闭合的；否则就是：
                 ////还有就是说：如果实力了一个XmlElement或XmlNode，如果不给它里面填充节点,结果就是：单闭合的：             ////如果填充了节点：就是双闭合的状态            ////            //XmlNode issueinv = doc.CreateElement("issueinv");            //XmlElement roots = doc.CreateElement("small");            //issueinv.AppendChild(roots);            //root.AppendChild(issueinv);            //doc.AppendChild(root);             #endregion            #region 0jbk3            //DateTime now = DateTime.Now;            ////XmlDocument doc = new XmlDocument();            //生成发票xml()            ////XmlDeclaration dec = doc.CreateXmlDeclaration("1.0", "GB2312", null);            ////doc.AppendChild(dec);            ////一语惊醒梦中你            ////从下面打印出来的节点看，差不多可以得出            ////XmlElement用于：
     
      Prozkb
                 ////XmlNode则用于            ////
     
       <--左边的这个是XMLNode            ////  
      
       invkind
       <--左边的这个是XMLElement            ////
                 //XmlElement root = doc.CreateElement("siiscmd");            //root.SetAttribute("xmlns", "AppSettings['xmlns']");            //doc.AppendChild(root);            //XmlNode issueinv = doc.CreateElement("issueinv");            //root.AppendChild(issueinv);            //XmlNode invrecord = doc.CreateElement("invrecord");            //issueinv.AppendChild(invrecord);            //XmlNode invrecordhead = doc.CreateElement("invrecordhead");            //invrecord.AppendChild(invrecordhead);            //XmlElement machinetaxnr = doc.CreateElement("machinetaxnr");            //machinetaxnr.InnerText = "AppSettings['machinetaxnr']";            //invrecordhead.AppendChild(machinetaxnr);            //XmlElement machinenr = doc.CreateElement("machinenr");            //machinenr.InnerText = "machinenr";            //invrecordhead.AppendChild(machinenr);            //XmlNode invkind = doc.CreateElement("invkind");            //XmlElement value = doc.CreateElement("value");            //value.InnerText = "invkind";            //invkind.AppendChild(value);            //invrecordhead.AppendChild(invkind);            //XmlNode doctype = doc.CreateElement("doctype");            //value = doc.CreateElement("value");            //value.InnerText = "doctype";            //doctype.AppendChild(value);            //invrecordhead.AppendChild(doctype);            //XmlElement docnr = doc.CreateElement("docnr");            //docnr.InnerText = "original_number";            //invrecordhead.AppendChild(docnr);            //XmlElement docdate = doc.CreateElement("docdate");            //docdate.InnerText = now.ToString("yyyy-MM-dd HH:mm:ss");            //invrecordhead.AppendChild(docdate);            //XmlElement custnr = doc.CreateElement("custnr");            //invrecordhead.AppendChild(custnr);             #endregion            doc.Save(@"d:\xxxxxX.xml");                            }    }}