遍历现有XML文件,同时写入到新文件中

         using System.Xml;
        using System.Xml.XPath;
        using System.IO;
        class Program
         {
             static StreamWriter sw = new StreamWriter(@"second.txt", true, Encoding.UTF8);
             //创建调用的实体 ,second---要写入的文件
             static XmlTextWriter xtw = new XmlTextWriter(sw);
             static void Main(string[] args)
             {
                 XPathDocument doc = new XPathDocument(@"first.xml");
                 //first---第一个文件
                 XPathNavigator navigator = doc.CreateNavigator();
                 navigator.MoveToRoot();
                 xtw.Formatting = Formatting.Indented;
                 CreatFiles("second"); //如果second.xml不存在,则在此创建
                 WriteRecursive(navigator); //从根节点开始
                 xtw.Flush();
                 xtw.Close();
             }
             static private void WriteRecursive(XPathNavigator navigator)
             {
                 if (navigator.HasChildren)
                 {
                     navigator.MoveToFirstChild();
                     WriteNode(navigator);
                     WriteRecursive(navigator);
                     navigator.MoveToParent();
                     while (navigator.MoveToNext())
                     {
                         WriteNode(navigator);
                         WriteRecursive(navigator);
                     }
                     if (navigator.MoveToParent() && navigator.Name != "root")
                     {
                         xtw.WriteEndElement();
                     }
                 }
                 else
                     xtw.WriteEndElement();
             }
             static private void WriteNode(XPathNavigator navigator)
             {
                 if (navigator.NodeType == XPathNodeType.Text)
                 {
                     xtw.WriteString(navigator.Value);
                     //写文本节点
                 }
                 else if (navigator.Name != string.Empty)
                 {
                     xtw.WriteStartElement(navigator.Name);
                     //写元素节点
                 }
             }
             static private void CreatFiles(string M_str_fname)
             {
                    XmlTextWriter xWriter = new XmlTextWriter(M_str_fname + ".xml", Encoding.Default);
                    xWriter.Formatting = Formatting.Indented;
                    xWriter.WriteStartDocument();
                    xWriter.WriteComment(M_str_fname);
                    string name = M_str_fname + ".txt"; //实体文件全名
                    xWriter.WriteDocType("Log", null, null, " ");//声明调用文件
                    xWriter.WriteStartElement("", M_str_fname, "");//引入调用文件
                    xWriter.WriteEntityRef("Log");
                    xWriter.WriteEndElement();
                    xWriter.WriteEndDocument();
                    xWriter.Flush();
                    xWriter.Close();
             }
         }
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