知识大全遍历现有XML文件,同时写入到新文件中

Posted 2022-07-17 文件

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　　用xpathnavigator和实体引用

　　xpathnavigator 虽然也是以DOM树方式在内在组织数据但已经过优化可对数据进行修改并且访问灵活对比XML LOAD()方式在效率上提升了不少

　　在追加时采用实体引用这样不会把新XML文件全部载入内存用流的方式追加到文件末尾省资源速度快当文件较大时尤为明显 using System Xml; using System Xml XPath; using System IO; class Program static StreamWriter sw = new StreamWriter(@ second txt true Encoding UTF ); //创建调用的实体 second 要写入的文件 static XmlTextWriter x = 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(); x 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 x Flush(); x 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 ) x WriteEndElement(); else x WriteEndElement(); static private void WriteNode(XPathNavigator navigator) if (navigator NodeType == XPathNodeType Text) x WriteString(navigator Value); //写文本节点 else if (navigator Name != string Empty) x 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 <!ENTITY Log SYSTEM + name + > );//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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知识大全 遍历现有XML文件,同时写入到新文件中

知识大全遍历现有XML文件,同时写入到新文件中