使用XmlWriter写XML文件

private const string filename = "demo.xml";
        static void Main(string[] args)
        {
            XmlTextWriter writer=new XmlTextWriter(filename,null);
            //进行输出格式缩进设置
            writer.Formatting = Formatting.Indented;
            //写XML声明
            writer.WriteStartDocument();

            //写出<?name text>的形式
            string PItext = "type='text/xsl' href='book.xsl'";
            writer.WriteProcessingInstruction("xml-stylesheet", PItext);

            //写DOCTYPE声明
            writer.WriteDocType("book", null, null, "<!ENTITY h 'hardcover'>");
            //写注释
            writer.WriteComment("这是xml注释行");
            //写一个开始元素（根元素）
            writer.WriteStartElement("book");
            //属性
            writer.WriteAttributeString("genre","novel");
            writer.WriteAttributeString("ISBN","1-234-4546");
            //书名元素
            writer.WriteElementString("title","XML大全");
            ////Write the style element
            writer.WriteStartElement("style");
            writer.WriteEntityRef("h");
            writer.WriteEndElement();

            writer.WriteElementString("price","23");
            //写入ＣＤＡＴＡ
            writer.WriteCData("Prices 15% off!!!");
            //关闭根元素
            writer.WriteEndElement();
            //结束编写
            writer.WriteEndDocument();
            //缓冲区的内容写入文件
            writer.Flush();
            writer.Close();
            //声明XML文档并加载
            XmlDocument doc = new XmlDocument();
            doc.PreserveWhitespace = true;
            doc.Load(filename);
            //将XML内容显示在控制台
            Console.Write(doc.InnerXml);
            Console.In.Read();