怎么操作XML文件,求助
using System.Xml;
namespace ModifyXmlDocument1
{
class ModifyXml
{
/* 实现在filename参数为文件名的xml文件中对所有price子元素值按discount打折，
* 并保存修改的xml文件。*/
static public void ModifyPrice(string filename, double discount)
{ /*怎么找到所有price子元素*/
}
/* 在xml文件中删除Title是strTitle参数的Book元素，如果删除成功，保存修改的xml文件，
* 并将修改的xml输出控制台，返回true，否则返回false，不输出。*/
static public bool DeleteBook(string filename, string strTitle)
{
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.Load(filename);
XmlNodeList xnl = xmlDoc.SelectSingleNode("bookstore").ChildNodes;
foreach (XmlNode xn in xnl)
{
XmlElement xe = (XmlElement)xn;
if (xe.GetAttributeNode("title") == strTitle) /*这里应该怎么写:删除Title是strTitle参数的Book元素*/
{
xe.RemoveAttribute("title");//删除genre属性
}
}
xmlDoc.Save(filename);
return true;
}
/*在xml文件中的bookstore元素最后添加以下book元素，并保存修改的xml文件：
* <book ，genre="Computer" publicationdate="2008" >
<title>C++ 程序设计</title>
<author>
<name>张文</name>
</author>
<price>39.50</price>
</book>*/
static public void InsertBook(string filename)
{
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.Load(filename);
XmlNode root = xmlDoc.SelectSingleNode("bookstore");//查找<bookstore>
XmlElement xe1 = xmlDoc.CreateElement("book");//创建一个<book>节点
xe1.SetAttribute("genre", "Computer");//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 = "C++ 程序设计";//设置文本节点
xe1.AppendChild(xesub1);//添加到<book>节点中
XmlElement xesub2 = xmlDoc.CreateElement("author");
xesub2.InnerText = "张文";
xe1.AppendChild(xesub2);
XmlElement xesub3 = xmlDoc.CreateElement("price");
xesub3.InnerText = "39.50";
xe1.AppendChild(xesub3);
root.AppendChild(xe1);//添加到<bookstore>节点中
xmlDoc.Save(filename);
}
/* 查询filename参数为文件名的xml中book/author/last-name值是lastName参数的Book元素，
* 返回该book的子元素title值。*/
static public void Main(string[] args)
{
InsertBook("C:\\books1.xml");
}
}
}
C:\\books1.xml文件:
<?xml version='1.0'?><!-- This file represents a fragment of a book store inventory database --><bookstore> <book genre="autobiography" publicationdate="1981" ISBN="1-861003-11-0"> <title>The Autobiography of Benjamin Franklin</title> <author> <first-name>Benjamin</first-name> <last-name>Franklin</last-name> </author> <price>8.99</price> </book> <book genre="novel" publicationdate="1967" ISBN="0-201-63361-2"> <title>The Confidence Man</title> <author> <first-name>Herman</first-name> <last-name>Melville</last-name> </author> <price>11.99</price> </book> <book genre="philosophy" publicationdate="1991" ISBN="1-861001-57-6"> <title>The Gorgias</title> <author> <name>Plato</name> </author> <price>9.99</price> </book></bookstore>
XDocument doc=XDocument.Load("C:\\books1.xml"); List<string> PList = new List<string>(); var query = from price in doc.Descendants("price") select price.Value; foreach (var item in query) { PList.Add(item); } doc.Save("C:\\books1.xml");
[解决办法]
//你的filename对应xml哪个？我对应title做测试 public static void ModifyPrice(string filename, double discount) { XDocument Doc = XDocument.Load(@"C:\books1.xml"); var Query = from D in Doc.Element("bookstore").Elements("book") where D.Element("title").Value.IndexOf(filename) > -1 select D; foreach (var v in Query) { v.Element("price").Value = (Convert.ToDouble(v.Element("price").Value) * discount).ToString(); } Doc.Save(@"C:\books1.xml"); } public static bool DeleteBook(string strTitle) { bool Result = false; try { XDocument Doc = XDocument.Load(@"C:\books1.xml"); Doc.Element("bookstore").Elements("book").Where(x => x.Element("title").Value == strTitle).Select(x => x).Remove(); Doc.Save(@"C:\books1.xml"); Result = true; Console.WriteLine(Doc.ToString()); } catch { } finally { } return Result; } public static void InsertBook(Book Book) { XDocument Doc = XDocument.Load(@"C:\books1.xml"); XElement node=new XElement("book",new XAttribute("genre",Book.genre), new XAttribute("publicationdate",Book.publicationdate), new XAttribute("ISBN",Book.ISBN), new XElement("title",Book.title), new XElement("author", new XElement("first-name",Book.first_name), new XElement("last-name"),Book.last_name), new XElement("price",Book.price)); Doc.Element(ElementNode).Add(node); Doc.Save(XmlPath); } static void Main(string[] args) { ModifyPrice("Autobiography", 0.9); Console.WriteLine(XDocument.Load(@"C:\books1.xml").ToString()); DeleteBook("The Confidence Man"); Console.ReadKey();
[解决办法]
public class Book { public string genre { get; set; } public string publicationdate { get; set; } public string ISBN { get; set; } public string title { get; set; } public string first_name { get; set; } public string last_name { get; set; } public string price { get; set; } }
[解决办法]
好长，我有做过一个很简单的xml的例子，不知道和你的一样不一样，需要的话，可以短我