C#中处理XML文档的方法
用的是一种很笨的方法,但可以帮助初学者了解访问XML节点的过程。
已知有一个XML文件(bookstore.xml)如下:
1: <?xml version="1.0" encoding="gb2312"?>
2: <bookstore>
3: <book genre="fantasy" ISBN="2-3631-4">
4: <title>Oberon's Legacy</title>
5: <author>Corets, Eva</author>
6: <price>5.95</price>
7: </book>
8: </bookstore>
1、往<bookstore>节点中插入一个<book>节点:
1: XmlDocument xmlDoc=new XmlDocument();
2: xmlDoc.Load("bookstore.xml");
3: XmlNode root=xmlDoc.SelectSingleNode("bookstore");//查找<bookstore>
4: XmlElement xe1=xmlDoc.CreateElement("book");//创建一个<book>节点
5: xe1.SetAttribute("genre","李赞红");//设置该节点genre属性
6: xe1.SetAttribute("ISBN","2-3631-4");//设置该节点ISBN属性
7: XmlElement xesub1=xmlDoc.CreateElement("title");
8: xesub1.InnerText="CS从入门到精通";//设置文本节点
9: xe1.AppendChild(xesub1);//添加到<book>节点中
10: XmlElement xesub2=xmlDoc.CreateElement("author");
11: xesub2.InnerText="候捷";
12: xe1.AppendChild(xesub2);
13: XmlElement xesub3=xmlDoc.CreateElement("price");
14: xesub3.InnerText="58.3";
15: xe1.AppendChild(xesub3);
16: root.AppendChild(xe1);//添加到<bookstore>节点中
17: xmlDoc.Save("bookstore.xml");
//================
结果为:
1: <?xml version="1.0" encoding="gb2312"?>
2: <bookstore>
3: <book genre="fantasy" ISBN="2-3631-4">
4: <title>Oberon's Legacy</title>
5: <author>Corets, Eva</author>
6: <price>5.95</price>
7: </book>
8: <book genre="李赞红" ISBN="2-3631-4">
9: <title>CS从入门到精通</title>
10: <author>候捷</author>
11: <price>58.3</price>
12: </book>
13: </bookstore>
2、修改节点:将genre属性值为“李赞红“的节点的genre值改为“update李赞红”,将该节点的子节点<author>的文本修改为“亚胜”。
1: XmlNodeList nodeList=xmlDoc.SelectSingleNode("bookstore").ChildNodes;//获取bookstore节点的所有子节点
2: foreach(XmlNode xn in nodeList)//遍历所有子节点
3: {
4: XmlElement xe=(XmlElement)xn;//将子节点类型转换为XmlElement类型
5: if(xe.GetAttribute("genre")=="李赞红")//如果genre属性值为“李赞红”
6: {
7: xe.SetAttribute("genre","update李赞红");//则修改该属性为“update李赞红”
8: XmlNodeList nls=xe.ChildNodes;//继续获取xe子节点的所有子节点
9: foreach(XmlNode xn1 in nls)//遍历
10: {
11: XmlElement xe2=(XmlElement)xn1;//转换类型
12: if(xe2.Name=="author")//如果找到
13: {
14: xe2.InnerText="亚胜";//则修改
15: break;//找到退出来就可以了
16: }
17: }
18: break;
19: }
20: }
21: xmlDoc.Save("bookstore.xml");//保存。
//=================
最后结果为:
1: <?xml version="1.0" encoding="gb2312"?>
2: <bookstore>
3: <book genre="fantasy" ISBN="2-3631-4">
4: <title>Oberon's Legacy</title>
5: <author>Corets, Eva</author>
6: <price>5.95</price>
7: </book>
8: <book genre="update李赞红" ISBN="2-3631-4">
9: <title>CS从入门到精通</title>
10: <author>亚胜</author>
11: <price>58.3</price>
12: </book>
13: </bookstore>
3、删除 <book genre="fantasy" ISBN="2-3631-4">节点的genre属性,删除 <book genre="update李赞红" ISBN="2-3631-4">节点。
1: XmlNodeList xnl=xmlDoc.SelectSingleNode("bookstore").ChildNodes;
2: foreach(XmlNode xn in xnl)
3: {
4: XmlElement xe=(XmlElement)xn;
5:
6: if(xe.GetAttribute("genre")=="fantasy")
7: {
8: xe.RemoveAttribute("genre");//删除genre属性
9: }
10: else if(xe.GetAttribute("genre")=="update李赞红")
11: {
12: xe.RemoveAll();//删除该节点的全部内容
13: }
14: }
15: xmlDoc.Save("bookstore.xml");
16:
//====================
最后结果为:
1: <?xml version="1.0" encoding="gb2312"?>
2: <bookstore>
3: <book ISBN="2-3631-4">
4: <title>Oberon's Legacy</title>
5: <author>Corets, Eva</author>
6: <price>5.95</price>
7: </book>
8: <book>
9: </book>
10: </bookstore>
4、显示所有数据。
1: XmlNode xn=xmlDoc.SelectSingleNode("bookstore");
2: XmlNodeList xnl=xn.ChildNodes;
3: foreach(XmlNode xnf in xnl)
4: {
5: XmlElement xe=(XmlElement)xnf;
6: Console.WriteLine(xe.GetAttribute("genre"));//显示属性值
7: Console.WriteLine(xe.GetAttribute("ISBN"));
8: XmlNodeList xnf1=xe.ChildNodes;
9: foreach(XmlNode xn2 in xnf1)
10: {
11: Console.WriteLine(xn2.InnerText);//显示子节点点文本
12: }
13: }
转载自:http://blog.csdn.net/s98/archive/2004/10/17/140307.aspx
1: XmlDocument xmlDoc=new XmlDocument();
2: xmlDoc.Load("c:/aaa.xml");
3: XmlNode xn=xmlDoc.SelectSingleNode("todate");
4: XmlNodeList xnl=xn.ChildNodes;
5: foreach(XmlNode xnf in xnl)
6: {
7: XmlElement xe=(XmlElement)xnf;
8: XmlNodeList xnf1=xe.ChildNodes;
9: Response.Write(xnf1[0].InnerText);//显示子节点点文本
10: }
11:
12: XmlDocument xmlDoc=new XmlDocument();
13: xmlDoc.Load("c:/aaa.xml");
14: XmlNode xn=xmlDoc.SelectSingleNode("todate");
15: XmlNodeList xnl=xn.ChildNodes;
16: foreach(XmlNode xnf in xnl)
17: {
18: XmlElement xe=(XmlElement)xnf;
19: XmlNodeList xnf1=xe.ChildNodes;
20: xnf1[0].InnerText="10";
21: xmlDoc.Save("c:/aaa.xml");