XML に対する CURD 操作の C# コード例

<?xml version="1.0" encoding="gb2312"?>
<bookstore>
<book genre="fantasy" ISBN="2-3631-4">
<title>Oberon&#39;s Legacy</title>
<author>Corets, Eva</author>
<price>5.95</price>
</book>
</bookstore>

XmlDocument xmlDoc=new XmlDocument();xmlDoc.Load("bookstore.xml");XmlNode root=xmlDoc.SelectSingleNode("bookstore");//查找<bookstore>XmlElement xe1=xmlDoc.CreateElement("book");//创建一个<book>节点xe1.SetAttribute("genre","李赞红");//设置该节点genre属性xe1.SetAttribute("ISBN","2-3631-4");//设置该节点ISBN属性
XmlElement xesub1=xmlDoc.CreateElement("title");xesub1.InnerText="CS从入门到精通";//设置文本节点xe1.AppendChild(xesub1);//添加到<book>节点中XmlElement xesub2=xmlDoc.CreateElement("author");xesub2.InnerText="候捷";xe1.AppendChild(xesub2);XmlElement xesub3=xmlDoc.CreateElement("price");xesub3.InnerText="58.3";xe1.AppendChild(xesub3);
root.AppendChild(xe1);//添加到<bookstore>节点中xmlDoc.Save("bookstore.xml");

<?xml version="1.0" encoding="gb2312"?>
<bookstore>
<book genre="fantasy" ISBN="2-3631-4">
<title>Oberon&#39;s Legacy</title>
<author>Corets, Eva</author>
<price>5.95</price>
</book>
<book genre="李赞红" ISBN="2-3631-4">
<title>CS从入门到精通</title>
<author>候捷</author>
<price>58.3</price>
</book>
</bookstore>

XmlNodeList nodeList=xmlDoc.SelectSingleNode("bookstore").ChildNodes;//获取bookstore节点的所有子节点foreach(XmlNode xn in nodeList)//遍历所有子节点{XmlElement xe=(XmlElement)xn;//将子节点类型转换为XmlElement类型if(xe.GetAttribute("genre")=="李赞红")//如果genre属性值为“李赞红”{xe.SetAttribute("genre","update李赞红");//则修改该属性为“update李赞红”
XmlNodeList nls=xe.ChildNodes;//继续获取xe子节点的所有子节点foreach(XmlNode xn1 in nls)//遍历{XmlElement xe2=(XmlElement)xn1;//转换类型if(xe2.Name=="author")//如果找到{xe2.InnerText="亚胜";//则修改break;//找到退出来就可以了}}break;}}
xmlDoc.Save("bookstore.xml");//保存。

<?xml version="1.0" encoding="gb2312"?>
<bookstore>
<book genre="fantasy" ISBN="2-3631-4">
<title>Oberon&#39;s Legacy</title>
<author>Corets, Eva</author>
<price>5.95</price>
</book>
<book genre="update李赞红" ISBN="2-3631-4">
<title>CS从入门到精通</title>
<author>亚胜</author>
<price>58.3</price>
</book>
</bookstore>

XmlNodeList xnl=xmlDoc.SelectSingleNode("bookstore").ChildNodes;
foreach(XmlNode xn in xnl){XmlElement xe=(XmlElement)xn;if(xe.GetAttribute("genre")=="fantasy"){xe.RemoveAttribute("genre");//删除genre属性}else if(xe.GetAttribute("genre")=="update李赞红"){xe.RemoveAll();//删除该节点的全部内容}}xmlDoc.Save("bookstore.xml");

<?xml version="1.0" encoding="gb2312"?>
<bookstore>
<book ISBN="2-3631-4">
<title>Oberon&#39;s Legacy</title>
<author>Corets, Eva</author>
<price>5.95</price>
</book>
<book>
</book>
</bookstore>