xml文件读写

创建xml文件，对xml文件进行添加新节点、删除节点、更新节点。创建的如下的xml文件。

<?xml version="1.0" encoding="UTF-8"?>



-<FileItems>





-<FileInfo fileid="12jdkfjdkfkdfjkdfj">



<FileName>test.txt</FileName>



<last_seen>2014-06-09 10:30</last_seen>



<pushFileStaus>完成</pushFileStaus>



<ActionType>上传</ActionType>



<logFilePath>C: est.txt</logFilePath>



<SavedSize>1200</SavedSize>



<localFilePath>C: est.txt</localFilePath>



<HostIP>172.19.8.121</HostIP>



<Port>999</Port>



</FileInfo>

 

对xml文件进行查找，可以使用using System.Xml.Linq;命名空间中的XElement(XName)类，使用myXElement.Elements().Where(node => node.Attribute("fileid").Value == "12jdkfjdkfkdfjkdfj");其中myXElement是XElement的实例对象、fileid是xml节点属性名，“12jdkfjdkfkdfjkdfj”是属性的值。

/// <summary>

        /// MainWindow.xaml 的交互逻辑

        /// </summary>

        public partial class MainWindow : Window

        {

                public MainWindow()

                {

                        InitializeComponent();

                }

                string FullPath = string.Format(@"{0}\{1}\{2}", Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData), "FilePulla",  "history.xml");

                /// <summary>

                /// 创建xml文件

                /// </summary>

                /// <param name="sender"></param>

                /// <param name="e"></param>

                private void button1_Click(object sender, RoutedEventArgs e)

                { 

                       FileInfo xmlFile= new FileInfo(FullPath);

                       XmlTextWriter xmlWriter = new XmlTextWriter(xmlFile.FullName, Encoding.UTF8);

                       xmlWriter.WriteStartDocument();

                       xmlWriter.WriteStartElement("FileItems");



                       xmlWriter.WriteStartElement("FileInfo");

                       xmlWriter.WriteAttributeString("fileid", "12jdkfjdkfkdfjkdfj");

                       xmlWriter.WriteElementString("FileName", "test.txt");

                       xmlWriter.WriteElementString("last_seen", "2014-06-09 10:30");

                       xmlWriter.WriteElementString("pushFileStaus", "完成");

                       xmlWriter.WriteElementString("ActionType", "上传");

                       xmlWriter.WriteElementString("logFilePath", "C:\test.txt");

                       xmlWriter.WriteElementString("SavedSize", "1200");

                       xmlWriter.WriteElementString("localFilePath", "C:\test.txt");

                       xmlWriter.WriteElementString("HostIP", "172.19.8.121");

                       xmlWriter.WriteElementString("Port", "999");

                       xmlWriter.WriteEndElement();



                        ////////////////////////////////////////////////////////////////////

                       xmlWriter.WriteStartElement("FileInfo");

                       xmlWriter.WriteAttributeString("fileid", "12jdkfjdkfkdfjkdfj");

                       xmlWriter.WriteElementString("FileName", "test.txt");

                       xmlWriter.WriteElementString("last_seen", "2014-06-09 10:30");

                       xmlWriter.WriteElementString("pushFileStaus", "完成");

                       xmlWriter.WriteElementString("ActionType", "上传");

                       xmlWriter.WriteElementString("logFilePath", "C:\test.txt");

                       xmlWriter.WriteElementString("SavedSize", "1200");

                       xmlWriter.WriteElementString("localFilePath", "C:\test.txt");

                       xmlWriter.WriteElementString("HostIP", "172.19.8.121");

                       xmlWriter.WriteElementString("Port", "999");

                       xmlWriter.WriteEndElement();



                       xmlWriter.WriteFullEndElement();

                       xmlWriter.WriteEndDocument();

                       xmlWriter.Close();



                }

                /// <summary>

                /// 在已存在的文件上，添加新节点

                /// </summary>

                /// <param name="sender"></param>

                /// <param name="e"></param>

                private void button2_Click(object sender, RoutedEventArgs e)

                {

                        if (File.Exists(FullPath))

                        {

                                XmlDocument xmlDoc = new XmlDocument();

                                xmlDoc.Load(FullPath);

                                XmlNode root = xmlDoc.SelectSingleNode("FileItems");

                                //查找<bookstore>

                                XmlElement element = xmlDoc.CreateElement("FileInfo");

                                element.SetAttribute("fileid", "12jdkfjdkfkdfjkdfjere");



                                XmlElement xesub1 = xmlDoc.CreateElement("FileName");

                                xesub1.InnerText = "test.txt";

                                element.AppendChild(xesub1);

                                //设置文本节点

                                XmlElement xesub10 = xmlDoc.CreateElement("last_seen");

                                xesub10.InnerText = "2014-06-09 11:35";

                                element.AppendChild(xesub10);



                                XmlElement xesub2 = xmlDoc.CreateElement("pushFileStaus");

                                xesub2.InnerText = "test.txt";

                                element.AppendChild(xesub2);

                                XmlElement xesub3 = xmlDoc.CreateElement("ActionType");

                                xesub3.InnerText = "test.txt";

                                element.AppendChild(xesub3);

                                XmlElement xesub4 = xmlDoc.CreateElement("logFilePath");

                                xesub4.InnerText = "test.txt";

                                element.AppendChild(xesub4);

                                XmlElement xesub5 = xmlDoc.CreateElement("SavedSize");

                                xesub5.InnerText = "test.txt";

                                element.AppendChild(xesub5);

                                XmlElement xesub6 = xmlDoc.CreateElement("localFilePath");

                                xesub6.InnerText = "test.txt";

                                element.AppendChild(xesub6);

                                XmlElement xesub7 = xmlDoc.CreateElement("HostIP");

                                xesub7.InnerText = "test.txt";

                                element.AppendChild(xesub7);

                                XmlElement xesub8 = xmlDoc.CreateElement("HostIP");

                                xesub8.InnerText = "test.txt";

                                element.AppendChild(xesub8);

                                XmlElement xesub9 = xmlDoc.CreateElement("Port");

                                xesub9.InnerText = "test.txt";

                                element.AppendChild(xesub9);

                                root.AppendChild(element);

                                xmlDoc.Save(FullPath);

                        }

                      

                }

               /// <summary>

               /// 删除节点

               /// </summary>

               /// <param name="sender"></param>

               /// <param name="e"></param>

                private void button3_Click(object sender, RoutedEventArgs e)

                {

                        XElement xmlDoc = XElement.Load(FullPath);

                        XElement selectedElement = xmlDoc.Elements().Where(xl => xl.Attribute("fileid").Value == "12jdkfjdkfkdfjkdfjere").FirstOrDefault();

                        if (selectedElement == null) return;

                        selectedElement.Remove();

                        xmlDoc.Save(FullPath);

                }

                /// <summary>

                /// 修改节点的值

                /// </summary>

                /// <param name="sender"></param>

                /// <param name="e"></param>

                private void button5_Click(object sender, RoutedEventArgs e)

                {

                        XElement xmlDoc = XElement.Load(FullPath);

                        XElement selectedElement = xmlDoc.Elements().Where(xl => xl.Attribute("fileid").Value == "12jdkfjdkfkdfjkdfjere").FirstOrDefault();

                        if (selectedElement == null) return;

                        selectedElement.Elements("pushFileStaus").FirstOrDefault().SetValue("完成");

                        xmlDoc.Save(FullPath);

                }

        }