C# 读写XML

我们来写；写的方法主要是创建一个XMLDocument，然后可以直接在Document中添加新的Element，也可以使用XPath定位后，结合XmlWriter往Doc里面写，写的方法应该还有很多。但是，够用就好。

代码：

using System.IO;
using System.Xml;
using System.Xml.XPath;

        private void button1_Click(object sender, EventArgs e)
        {
            XmlDocument xmlDoc = null;

            xmlDoc = new XmlDocument();

            string strVersion = "1.0";
            string strLevel = "F";
            string strFile = "c.cpp";

            // Declaration
            XmlDeclaration declaration = xmlDoc.CreateXmlDeclaration("1.0", "UTF-8", null);
            xmlDoc.AppendChild(declaration);

            //--------------------------
            // Root element
            //--------------------------
            XmlElement xmlRoot = xmlDoc.CreateElement("Report");

            // Version string
            XmlAttribute typeAttribute = xmlDoc.CreateAttribute("Version");
            xmlRoot.SetAttributeNode(typeAttribute);
            xmlRoot.SetAttribute("Version", strVersion);

            // Level string
            typeAttribute = xmlDoc.CreateAttribute("Level");
            xmlRoot.SetAttributeNode(typeAttribute);
            xmlRoot.SetAttribute("Level", strLevel);

            // File string
            typeAttribute = xmlDoc.CreateAttribute("File");
            xmlRoot.SetAttributeNode(typeAttribute);
            xmlRoot.SetAttribute("File", strFile);

            xmlDoc.AppendChild(xmlRoot);

            //--------------------------
            // Add Function Element using XmlWriter
            //--------------------------
            AddFunctionElement(xmlDoc, @"/*", "Main", "1");

            // aslo could add statement by using the XPath express  "/*/Function[@Name=Main]"
            AddStatementElement(xmlDoc, @"/*/Function[@Name='Main']", "If");

            xmlDoc.Save(@"d:\test.xml");
        }

        public void AddFunctionElement(XmlDocument xmlDoc, string strXPath, string strFunctionname, string strNo)
        {
            XmlElement xmlRoot = xmlDoc.DocumentElement;

            // Get the position
            XmlNode node = xmlRoot.SelectSingleNode(strXPath);
            if (node!=null)
            {
                XPathNavigator nodesNavigator = node.CreateNavigator();

                // Add new  Node
                XmlWriter summaryWriter = nodesNavigator.AppendChild();
                summaryWriter.WriteStartElement("Function");

                summaryWriter.WriteStartAttribute("No");        // Attribute "No"            
                summaryWriter.WriteString(strNo);               // Attribute Value             
                summaryWriter.WriteEndAttribute();

                summaryWriter.WriteStartAttribute("Name");      // Attribute "Name"            
                summaryWriter.WriteString(strFunctionname);         // Attribute Value             
                summaryWriter.WriteEndAttribute();

                summaryWriter.WriteEndElement();

                summaryWriter.Close();
            }
        }
        public void AddStatementElement(XmlDocument xmlDoc, string strXPath, string strStatement)
        {
            XmlElement xmlRoot = xmlDoc.DocumentElement;

            // Get the position
            XmlNode node = xmlRoot.SelectSingleNode(strXPath);
            if (node != null)
            {
                XPathNavigator nodesNavigator = node.CreateNavigator();

                // Add new File Node
                XmlWriter summaryWriter = nodesNavigator.AppendChild();
                summaryWriter.WriteStartElement("Statement");

                summaryWriter.WriteStartAttribute("Type");      // Attribute "Type"            
                summaryWriter.WriteString(strStatement);         // Attribute Value             
                summaryWriter.WriteEndAttribute();

                summaryWriter.WriteEndElement();

                summaryWriter.Close();
            }
        }