1 private static void GetXmlNodeInforOld(string xmlPath)
2 {
3 try
4 {
5 XDocument myXDoc = XDocument.Load(xmlPath);
6 XElement rootNode = myXDoc.Element("Users");
7 foreach (XElement node in rootNode.Elements("User"))
8 {
9 Console.WriteLine("User ID = {0}", node.Attribute("ID").Value);
10
11 string name = node.Element("name").Value;
12 string password = node.Element("password").Value;
13 string description = node.Element("description").Value;
14 Console.WriteLine("name = {0} \npassword = {1} \ndescription = {2}", name, password, description);
15 }
16 }
17 catch (Exception ex)
18 {
19 Console.WriteLine(ex.ToString());
20 }
21 }
22
23 private static void GetXmlNodeInformation(string xmlPath)
24 {
25 try
26 {
27 //定义并从xml文件中加载节点（根节点）
28   XElement rootNode = XElement.Load(xmlPath);
29 //查询语句: 获得根节点下name子节点（此时的子节点可以跨层次：孙节点、重孙节点......）
30 IEnumerable<XElement> targetNodes = from target in rootNode.Descendants("name")
31 select target;
32 foreach (XElement node in targetNodes)
33 {
34 Console.WriteLine("name = {0}", node.Value);
35 }
36
37 //查询语句: 获取ID属性值等于"111111"并且函数子节点的所有User节点（并列条件用"&&"符号连接）
38 IEnumerable<XElement> myTargetNodes = from myTarget in rootNode.Descendants("User")
39 where myTarget.Attribute("ID").Value.Equals("111111")
&& myTarget.HasElements
40 select myTarget;
41 foreach (XElement node in myTargetNodes)
42 {
43 Console.WriteLine("name = {0}", node.Element("name").Value);
44 Console.WriteLine("password = {0}", node.Element("password").Value);
45 Console.WriteLine("description = {0}", node.Element("description").Value);
46 }
47 }
48 catch (Exception ex)
49 {
50 Console.WriteLine(ex.ToString());
51 }
52 }

1 private static void ModifyXmlNodeInforOld(string xmlPath)
2 {
3 try
4 {
5 XDocument myXDoc = XDocument.Load(xmlPath);
6 myXDoc.Element("Users").Element("User").Attribute("ID").Value = "777777";
7 foreach (XElement node in myXDoc.Element("Users").Elements("User").Elements("description"))
8 {
9 node.SetValue("Hello, I'm from China.");
10 }
11 myXDoc.Save(xmlPath);
12 }
13 catch (Exception ex)
14 {
15 Console.WriteLine(ex.ToString());
16 }
17 }
18
19 private static void ModifyXmlNodeInformation(string xmlPath)
20 {
21 try
22 {
23 //定义并从xml文件中加载节点（根节点）
24 XElement rootNode = XElement.Load(xmlPath);
25 //查询语句: 获取ID属性值等于"222222"或者等于"777777"的所有User节点（或条件用"||"符号连接）
26 IEnumerable<XElement> targetNodes = from target in rootNode.Descendants("User")
27 where target.Attribute("ID").Value == "222222"
|| target.Attribute("ID").Value.Equals("777777")
28 select target;
29 //遍历所获得的目标节点（集合）
30 foreach (XElement node in targetNodes)
31 {
32 //将description节点的InnerText设置为"Hello, I'm from USA."
33 node.Element("description").SetValue("Hello, I'm from USA.");
34 }
35 //保存对xml的更改操作
36 rootNode.Save(xmlPath);
37 }
38 catch (Exception ex)
39 {
40 Console.WriteLine(ex.ToString());
41 }
42 }

1 private static void AddXmlNodeInformation(string xmlPath)
2 {
3 try
4 {
5 //定义并从xml文件中加载节点（根节点）
6 XElement rootNode = XElement.Load(xmlPath);
7 //定义一个新节点
8 XElement newNode = new XElement("User", new XAttribute("ID","999999"),
9 new XElement("name", "Rose"),
10 new XElement("password", "456123"),
11 new XElement("description", "Hello, I'm from UK."));
12 //将此新节点添加到根节点下
13 rootNode.Add(newNode);
14 //保存对xml的更改操作
15 rootNode.Save(xmlPath);
16 }
17 catch (Exception ex)
18 {
19 Console.WriteLine(ex.ToString());
20 }
21 }

1 private static void DeleteXmlNodeInformation(string xmlPath)
2 {
3 try
4 {
5 //定义并从xml文件中加载节点（根节点）
6 XElement rootNode = XElement.Load(xmlPath);
7 //查询语句: 获取ID属性值等于"999999"的所有User节点
8 IEnumerable<XElement> targetNodes = from target in rootNode.Descendants("User")
9 where target.Attribute("ID").Value.Equals("999999")
10 select target;
11
12 //将获得的节点集合中的每一个节点依次从它相应的父节点中删除
13 targetNodes.Remove();
14 //保存对xml的更改操作
15 rootNode.Save(xmlPath);
16 }
17 catch (Exception ex)
18 {
19 Console.WriteLine(ex.ToString());
20 }
21 }