C#中利用XML文件保存数据

using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.IO; using System.Xml; using System.Windows.Forms; //不同的命名空间 namespace TestXML { class XML { string xmlname; string name; string path = Application.StartupPath; XmlDocument xmlDoc; XmlNode node, root; public XML(string str) { xmlname = str; CreateXmlFile(); } /// <summary> /// 创建节点 /// </summary> /// <param name="xmlDoc"></param> xml文档 /// <param name="parentNode"></param> 父节点 /// <param name="name"></param> 节点名 /// <param name="value"></param> 节点值 public void CreateNode( XmlNode parentNode, string name, string value) { XmlNode node = xmlDoc.CreateNode(XmlNodeType.Element, name, null); node.InnerText = value; parentNode.AppendChild(node); } /// <summary> /// 通过文件读取xml /// </summary> public string QueryElementByFile(string section_name,string val_key) { xmlDoc = new XmlDocument(); //获取根节点 xmlDoc.Load(path + "\\" + xmlname); XmlElement root = xmlDoc.DocumentElement; //获取子节点 XmlNodeList personNodes = root.GetElementsByTagName(section_name); //使用foreach循环读出集合 foreach (XmlNode node in personNodes) { //string id = ((XmlElement)node).GetAttribute("id"); if (node.Name.ToString() == section_name) { name = ((XmlElement)node).GetElementsByTagName(val_key)[0].InnerText; return name; } //Console.WriteLine("name:" + name); } return ""; } /// <summary> /// 创建XML文件 /// </summary> public void CreateXmlFile() { if (File .Exists(path + "\\" + xmlname)) { xmlDoc = new XmlDocument(); xmlDoc.Load(path + "\\" + xmlname); } else { xmlDoc = new XmlDocument(); //创建类型声明节点 node = xmlDoc.CreateXmlDeclaration("1.0", "utf-8", ""); xmlDoc.AppendChild(node); //创建根节点 root = xmlDoc.CreateElement("Config"); xmlDoc.AppendChild(root); try { xmlDoc.Save(path + "\\" + xmlname); } catch (Exception e) { //显示错误信息 Console.WriteLine(e.Message); } } } /// <summary> /// /// </summary> XmlElement Shutdent, eSex; XmlNodeList nodelist; XmlText tSex; int count =0; /// <summary> /// 创建子节点：含二级三级节点 /// </summary> /// <param name="section_name"></param> /// <param name="property_name"></param> /// <param name="key_name"></param> public void CreateXmlNode(string section_name, string property_name, string key_name) { if (!File.Exists(path + "\\" + xmlname)) { xmlDoc = new XmlDocument(); xmlDoc.Load(path + "\\" + xmlname); } count = count + 1; XmlElement root = xmlDoc.DocumentElement; //得到根节点 if (count==1) { Shutdent = xmlDoc.CreateElement(section_name);//添加二级子节点 eSex = xmlDoc.CreateElement(property_name);//添加三级子节点 tSex = xmlDoc.CreateTextNode(key_name);//添加三级子节点属性值 eSex.AppendChild(tSex);//子节点添加内容 Shutdent.AppendChild(eSex);//将子节点添加进学生标记 } else { XmlNode memberlist = xmlDoc.SelectSingleNode("Config"); nodelist = memberlist.ChildNodes; foreach (XmlNode node in nodelist) { int nodecount=node.ChildNodes.Count; // Console.WriteLine(" node.ChildNodes.Count:" + nodecount); if (node.Name.ToString() == section_name)//判断节点名是否相同 { for (int i = 0; i < nodecount; i++) { if (node.ChildNodes[i].InnerText.ToString() == key_name && node.ChildNodes[i].Name.ToString() == property_name)//判断节点内容是否相同 { Console.WriteLine("重复增加！！！：" + node.ChildNodes[i].InnerText.ToString()); return; } else { eSex = xmlDoc.CreateElement(property_name);//添加三级子节点 tSex = xmlDoc.CreateTextNode(key_name);//添加三级子节点属性值 eSex.AppendChild(tSex);//子节点添加内容 Shutdent.AppendChild(eSex);//将子节点添加进学生标记 //MessageBox.Show("成功！！！：" + node.Name.ToString()); } } } else { Shutdent = xmlDoc.CreateElement(section_name);//添加二级子节点 eSex = xmlDoc.CreateElement(property_name);//添加三级子节点 tSex = xmlDoc.CreateTextNode(key_name);//添加三级子节点属性值 eSex.AppendChild(tSex);//子节点添加内容 Shutdent.AppendChild(eSex);//将子节点添加进二级标记 } } } root.AppendChild(Shutdent);//将<学生>标记添加进根节点 try { xmlDoc.Save(path + "\\" + xmlname); } catch (Exception e) { //显示错误信息 Console.WriteLine(e.Message); } } } }