asp.net 实现对xml文件的 读取,添加,删除,修改

用于修改站内xml文件

已知有一个XML文件（bookstore.xml）如下：
<?xml version="1.0" encoding="gb2312"?>
<bookstore>
<book genre="fantasy" ISBN="2-3631-4">
<title>Oberon's Legacy</title>
<author>Corets, Eva</author>
<price>5.95</price>
</book>
</bookstore>

1、往<bookstore>节点中插入一个<book>节点：

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","RevengeBoy");//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");

//================
结果为：

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

2、修改节点：将genre属性值为“RevengeBoy“的节点的genre值改为“updateRevengeBoy”，将该节点的子节点<author>的文本修改为“亚胜”。

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")=="RevengeBoy")//如果genre属性值为“RevengeBoy”
{
xe.SetAttribute("genre","updateRevengeBoy");//则修改该属性为“updateRevengeBoy”

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。

//=================

最后结果为：

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

3、删除 <book genre="fantasy" ISBN="2-3631-4">节点的genre属性，删除 <book genre="updateRevengeBoy" ISBN="2-3631-4">节点。

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")=="updateRevengeBoy")
{
xe.RemoveAll();//删除该节点的全部内容
}
}
xmlDoc.Save("bookstore.xml");

//====================

最后结果为：

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

4、显示所有数据。

XmlNode xn=xmlDoc.SelectSingleNode("bookstore");

XmlNodeList xnl=xn.ChildNodes;

foreach(XmlNode xnf in xnl)
{
XmlElement xe=(XmlElement)xnf;
Console.WriteLine(xe.GetAttribute("genre"));//显示属性值
Console.WriteLine(xe.GetAttribute("ISBN"));

XmlNodeList xnf1=xe.ChildNodes;
foreach(XmlNode xn2 in xnf1)
{
Console.WriteLine(xn2.InnerText);//显示子节点点文本
}
}

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

using System.Xml;
using System.Xml.XPath;
using System.Runtime.InteropServices;

public partial class _Default : System.Web.UI.Page
{
DataTable dtList ;
DataRow dr;
[DllImport("kernel32.dll")]
static extern bool SetFileAttributes(string lpFileName, uint dwFileAttributes);

public DataTable MakeTable(string tbName)
{
// Create a DataTable.
DataTable table = new DataTable(tbName);

// Create a DataColumn and set various properties.
DataColumn column = new DataColumn();
column.DataType = System.Type.GetType("System.String");
column.AllowDBNull = false;
column.Caption = "ProductId";
column.ColumnName = "ProductId";

// Add the column to the table.
table.Columns.Add(column);
DataColumn column1 = new DataColumn();
column1.DataType = System.Type.GetType("System.String");

column1.Caption = "Title";
column1.ColumnName = "Title";

// Add the column to the table.
table.Columns.Add(column1);
DataColumn column2 = new DataColumn();
column2.DataType = System.Type.GetType("System.String");

column2.Caption = "TagLine";
column2.ColumnName = "TagLine";

// Add the column to the table.
table.Columns.Add(column2);

DataColumn column3 = new DataColumn();
column3.DataType = System.Type.GetType("System.String");

column3.Caption = "Image";
column3.ColumnName = "Image";

// Add the column to the table.
table.Columns.Add(column3);
DataColumn column4 = new DataColumn();
column4.DataType = System.Type.GetType("System.String");

column4.Caption = "ProductInfo";
column4.ColumnName = "ProductInfo";

// Add the column to the table.
table.Columns.Add(column4);

return table;
}
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
this.ProductId.Visible = false;
this.ProductIdTB.Visible = false;
Bind();
this.DropDownList1.DataSource = dtList;
this.DropDownList1.Items.Clear();
this.DropDownList1.DataTextField = "Title";
this.DropDownList1.DataValueField = "ProductId";
this.DropDownList1.DataBind();
}
}

private void Bind()
{
dtList = MakeTable("Product");
XPathDocument doc = new XPathDocument(Server.MapPath("Helpme.xml"));
XPathNavigator navigator = doc.CreateNavigator();

foreach (XPathNavigator nav in navigator.Select("/Products/Product"))
{
do
{
//Find the first element.
if (nav.NodeType == XPathNodeType.Element)
{
//Determine whether children exist.
if (nav.HasChildren == true)
{
dr = dtList.NewRow();
//Move to the first child.
nav.MoveToFirstChild();
//Loop through all the children.
do
{
if (nav.Name == "ProductId")
dr["ProductId"] = nav.Value;
if (nav.Name == "Title")
dr["Title"] = nav.Value;
if (nav.Name == "TagLine")
dr["TagLine"] = nav.Value;
if (nav.Name == "Image")
dr["Image"] = nav.Value;
if (nav.Name == "ProductInfo")
dr["ProductInfo"] = nav.Value;

} while (nav.MoveToNext());
dtList.Rows.Add(dr);
}
}
} while (nav.MoveToNext());

}
}
protected void Button1_Click(object sender, EventArgs e)
{
string rootFolder = Server.MapPath("Helpme.xml");
XmlDocument doc = new XmlDocument();
doc.Load(rootFolder);
XPathNavigator navigator = doc.CreateNavigator();
foreach (XPathNavigator nav in navigator.Select("/Products/Product"))
{
do
{
//Determine whether children exist.
if (nav.HasChildren == true)
{
nav.MoveToFirstChild();
//Loop through all the children.
do
{
if (nav.Name == "ProductId")
{
if(nav.Value== this.DropDownList1.SelectedValue.Trim())
{
do
{
if (nav.Name == "Title")
nav.SetValue(this.titleTB.Text);
if (nav.Name == "TagLine")
nav.SetValue(this.TagLineTB.Text);
if (nav.Name == "Image")
nav.SetValue(this.ImageTB.Text);
if (nav.Name == "ProductInfo")
nav.SetValue(this.ProductInfoTB.Text);
}
while (nav.MoveToNext());
}
}
}
while (nav.MoveToNext());
}
}
while (nav.MoveToNext());
}
SetFileAttributes(rootFolder, (uint)0);//修改文件属性，去掉所有属性！
SetFileAttributes(rootFolder, (uint)128); // FILE_ATTRIBUTE_NORMAL
doc.Save(rootFolder);
}
protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
{
this.TextBox1.Text = this.DropDownList1.SelectedValue.Trim();
Bind();
DataView dv = dtList.DefaultView;
dv.RowFilter = "ProductId = '" + this.DropDownList1.SelectedValue.Trim() + "'";
this.titleTB.Text = dv[0].Row["Title"].ToString();
this.TagLineTB.Text = dv[0].Row["TagLine"].ToString();
this.ImageTB.Text = dv[0].Row["Image"].ToString();
this.ProductInfoTB.Text = dv[0].Row["ProductInfo"].ToString();
}
protected void BtnIns_Click(object sender, EventArgs e)
{
this.ProductId.Visible = true;
this.ProductIdTB.Visible = true;
string rootFolder =Server.MapPath( "Helpme.xml");
string  pid = this.ProductIdTB.Text;
string tit = this.titleTB.Text;
string tag = this.TagLineTB.Text;
string Img = this.ImageTB.Text;
string pinfo = this.ProductInfoTB.Text;
if(pid != string.Empty&&tit != string.Empty&&tag !=string.Empty&&Img != string.Empty&&pinfo != string.Empty)
{
XmlDocument doc = new XmlDocument();
doc.Load(rootFolder);

XmlNode root = doc.DocumentElement;
XmlNode pr = doc.CreateElement("Product");

//Create  new nodes.
XmlNode elem = doc.CreateElement("ProductId");
elem.InnerText = pid;

XmlNode title = doc.CreateElement("Title");
title.InnerText = tit;

XmlNode tl = doc.CreateElement("TagLine");
tl.InnerText = tag;

XmlNode ima = doc.CreateElement("Image");
ima.InnerText = Img;

XmlNode prin = doc.CreateElement("ProductInfo");
prin.InnerText = pinfo;

//Add the node to the document.
pr.InsertAfter(prin, pr.NextSibling);
pr.InsertAfter(ima, pr.NextSibling);
pr.InsertAfter(tl, pr.NextSibling);
pr.InsertAfter(title, pr.NextSibling);
pr.InsertBefore(elem, pr.FirstChild);
root.InsertBefore(pr, root.FirstChild);

SetFileAttributes(rootFolder, (uint)0);//修改文件属性，去掉所有属性！
SetFileAttributes(rootFolder, (uint)128); // FILE_ATTRIBUTE_NORMAL
doc.Save(rootFolder);
}

}
protected void DelBtn_Click(object sender, EventArgs e)
{
string rootFolder =Server.MapPath( "Helpme.xml");
XmlDocument doc = new XmlDocument();
doc.Load(rootFolder);
XPathNavigator navigator = doc.CreateNavigator();
foreach (XPathNavigator nav in navigator.Select("/Products/Product"))
{
do
{
//Determine whether children exist.
if (nav.HasChildren == true)
{
nav.MoveToFirstChild();
//Loop through all the children.
do
{
if (nav.Name == "ProductId")
{
if (nav.Value == this.DropDownList1.SelectedValue.Trim())
{
nav.MoveToParent();
if (nav.Name == "Product")
nav.DeleteSelf();
}

}

} while (nav.MoveToNext());
}
else
{
nav.MoveToParent();
if (nav.Name == "Product")
nav.DeleteSelf();
}

} while (nav.MoveToNext());

}
SetFileAttributes(rootFolder, (uint)0);//修改文件属性，去掉所有属性！
SetFileAttributes(rootFolder, (uint)128); // FILE_ATTRIBUTE_NORMAL
doc.Save(rootFolder);
}
}

当修改的是文件不在该站点下时 应该使用绝对路径..