asp.net C#对xml文档创建 修改 删除 查找

1、创建 XML

导入命名空间：

using System.Xml;

//创建 XML 对象

XmlDocument  xmlDocument = new XmlDocument();

// 声明 XML

XmlDeclaration xmlDeclare =xmlDocument.CreateXmlDeclaration("1.0","utf-8",null);

//创建根节点

XmlElement elementRoot =xmlDocument.CreateElement("Nodes");

xmlDocument.AppendChild(elementRoot);

//创建节点 Day

XmlElement elementDay = xmlDocument.CreateElement("Day");

//给节点Day设置属性，并赋值

elementDay.SetAttribute("date","今天");

elementRoot.AppendChild(elementDay);

//创建 Day 的子节点Part

XmlElement elementPart = xmlDocument.CreateElement("Part");

elementPart.InnerText = " aaa";

elementDay.AppendChild(elementPart);

//保存到 XML 文件件下

xmlDocument.Save("./myXml.xml");

 

xml 生成数据：

<Notes>

     <Day date="今天">

              <part>aaa</part>

     </Day>

</Notes>

 

2.读写XML文件

<?xml version="1.0" encoding="utf-8" ?>
<PhoneBook>
<phone id="001">
<Name>加菲尔德</Name>
<Number>5555555</Number>
<City>纽约</City>
<DateOfBirth>26/10/1978</DateOfBirth>
</phone>
<phone id="002">
<Name>迈克</Name>
<Number>6666666</Number>
<City>纽约</City>
<DateOfBirth>12/02/1978</DateOfBirth>
</phone>
</PhoneBook>

*********************************************************************

·使用Document读取及写入XML方法

private void xmlfun()
{
XmlDocument doc = new XmlDocument();
doc.Load(Server.MapPath("phone.xml"));

XmlElement node = doc.CreateElement("phone");
XmlAttribute atr = doc.CreateAttribute("id");
atr.InnerText = "003";
node.Attributes.Append(atr);

XmlNode xnode = (XmlNode)doc.CreateElement("Name");
xnode.InnerText="testName";
node.AppendChild(xnode);

xnode = (XmlNode)doc.CreateElement("Number");
xnode.InnerText="119";
node.AppendChild(xnode);
xnode = (XmlNode)doc.CreateElement("City");
xnode.InnerText="cs";
node.AppendChild(xnode);
xnode = (XmlNode)doc.CreateElement("DateOfBirth");
xnode.InnerText="12/02/1978";
node.AppendChild(xnode);
doc.DocumentElement.InsertAfter(node,doc.DocumentElement.LastChild);

doc.Save(Server.MapPath("phone1.xml"));   //必须要存为不同的文件

}

 

·使用XmlTextWriter写入XML方法

private void xmlwriter()
{
XmlTextWriter writer= new XmlTextWriter(Server.MapPath("phone4.xml"),null);
writer.Formatting = Formatting.Indented;  //缩进格式
writer.Indentation =4;

writer.WriteStartDocument();

writer.WriteStartElement("Person");

writer.WriteStartAttribute("ID",null);
writer.WriteString("004");
writer.WriteEndAttribute();

writer.WriteStartElement("Name");
writer.WriteString("testWriterName");
writer.WriteEndElement();

writer.WriteStartElement("Number");
writer.WriteString("88888");
writer.WriteEndElement();

writer.WriteStartElement("City");
writer.WriteString("testWriterCity");
writer.WriteEndElement();

writer.Flush();
writer.Close();

}

 

·使用XmlTextReader读取XML方法

private void xmlread()
{
XmlTextReader reader = new XmlTextReader(Server.MapPath("phone.xml"));
while(reader.Read())
{
if(reader.LocalName.Equals("Name") || reader.LocalName.Equals("Number"))
{
this.Label1.Text += reader.ReadString()+"t";
}

 

·作用SqlCommand.ExecuteXmlReader()取得XML

SqlConnecting conn = new SqlConnection(CONNSTR);
SqlCommand cmd = new SqlCommand("select fname from employee for xml auto",conn);
conn.open();
XmlReader reader = cmd.ExecuteXmlReader();
......
################ 所取xml数据格式 #################

<employee fname="aria"/>
<employee fname="carlors"/>......

3.查找xml

<Placemark>

      <description>Front line</description>

      <Name>sole</Name>

      <styleUrl>#roadStyle</styleUrl>

      <LineString>

        <coordinates>

               114.0456,22.324

            </coordinates>

      </LineString>

    </Placemark>

如何根据Name的值找到这个Placemark

让后插入数据到

coordinates节点中呢。

 

XmlElement Chid_Elent = Doc.DocumentElement; //得到XML的根节点
if (Chid_Elent.ChildNodes.Count > 0)//如果根节点下有子节点
{
foreach (XmlElement Elent in Chid_Elent.ChildNodes)//循环获取节点值
{
value=Elent.InnerText;//得到值
Elent.InnerText=vaue; //或者赋值  value为外部变量
}
}

 

最后save(路径)

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
}
}

 

最后附一个C#操作Xml通用工具类

using System;
using System.Xml;

namespace WLerp.Common.Util
{
/// <summary>
/// Xml 操作工具类
/// </summary>
public sealed class XmlUtil
{
private XmlUtil() { }

/// <summary>
/// 创建节点
/// </summary>
/// <param name="node"></param>
/// <param name="newElementName"></param>
/// <returns></returns>
public static XmlNode AppendElement(XmlNode node, string newElementName)
{
return AppendElement(node, newElementName, null);
}

/// <summary>
/// 创建节点
/// </summary>
/// <param name="node"></param>
/// <param name="newElementName"></param>
/// <param name="innerValue"></param>
/// <returns></returns>
public static XmlNode AppendElement(XmlNode node, string newElementName, string innerValue)
{
XmlNode oNode;
if (node is XmlDocument)
{
oNode = node.AppendChild(((XmlDocument)node).CreateElement(newElementName));
}
else
{
oNode = node.AppendChild(node.OwnerDocument.CreateElement(newElementName));
}

if (innerValue != null)
{
oNode.AppendChild(node.OwnerDocument.CreateTextNode(innerValue));
}
return oNode;
}

/// <summary>
/// 创建属性
/// </summary>
/// <param name="xmlDocument"></param>
/// <param name="name"></param>
/// <param name="value"></param>
/// <returns></returns>
public static XmlAttribute CreateAttribute(XmlDocument xmlDocument, string name, string value)
{
XmlAttribute oAtt = xmlDocument.CreateAttribute(name);
oAtt.Value = value;
return oAtt;
}

/// <summary>
/// 设置属性的值
/// </summary>
/// <param name="node"></param>
/// <param name="attributeName"></param>
/// <param name="attributeValue"></param>
public static void SetAttribute(XmlNode node, string attributeName, string attributeValue)
{
if (node.Attributes[attributeName] != null)
{
node.Attributes[attributeName].Value = attributeValue;
}
else
{
node.Attributes.Append(CreateAttribute(node.OwnerDocument, attributeName, attributeValue));
}
}

/// <summary>
/// 获取属性的值
/// </summary>
/// <param name="node"></param>
/// <param name="attributeName"></param>
/// <param name="defaultValue"></param>
/// <returns></returns>
public static string GetAttribute(XmlNode node, string attributeName, string defaultValue)
{
XmlAttribute att = node.Attributes[attributeName];
if (att != null)
{
return att.Value;
}
else
{
return defaultValue;
}
}

/// <summary>
/// 获取节点的值
/// </summary>
/// <param name="parentNode"></param>
/// <param name="nodeXPath"></param>
/// <param name="defaultValue"></param>
/// <returns></returns>
public static string GetNodeValue(XmlNode parentNode, string nodeXPath, string defaultValue)
{
XmlNode node = parentNode.SelectSingleNode(nodeXPath);
if (node.FirstChild != null)
{
return node.FirstChild.Value;
}
else if (node != null)
{
return node.Value;
}
else
{
return defaultValue;
}
}
}
}

 读取XML节点属性值及节点值

protected void ReadNode_Click(object sender, EventArgs e)
{
XmlDocument doc = new XmlDocument();
doc.Load(Server.MapPath("Student1.xml"));

XmlNodeList list = doc.GetElementsByTagName("StuName"); //Student1.xml文件里面的StuName节点
foreach (XmlElement host in list)
{
Response.Write("Student1.xml节点里面的StuName节点的name属性的值为：" + host.Attributes["name"].Value + "<br/>");
Response.Write("Student1.xml节点里面的StuName节点的id属性的值为：" + host.Attributes["id"].Value + "<br/>");
}

String d1 = doc.SelectSingleNode("//StuName[@id='1']/@name").Value;//读取stuname标签里面的id为1的name的值
Response.Write("Student1.xml节点里面的StuName节点的name属性的值为：" + d1 + "<br/>");

}

protected void readxml()
{

XmlDocument xmlDoc = new XmlDocument();
xmlDoc.Load(Server.MapPath("Student1.xml")); //加载xml
XmlNodeList NodeList = xmlDoc.SelectNodes("/Students/Student"); //xml节点的路径
//循环遍历节点
for (int i = 0; i < NodeList.Count; i++)
{
string xmlStuName = NodeList[i].ChildNodes[0].InnerText;    //获取第一个Student节点的StuName
string xmlStuSex = NodeList[i].ChildNodes[1].InnerText;     //获取第一个Student节点的StuSex
string xmlStuAge = NodeList[i].ChildNodes[2].InnerText;     //获取第一个Student节点的StuAge
string xmlStuAddress = NodeList[i].ChildNodes[3].InnerText; //获取第一个Student节点的StuAddress
//循环读取xml节点信息
Response.Write("当前的xml文件中的节点StuName是：" + xmlStuName + "<br />" + "当前的xml文件中的节点StuSex是：" + xmlStuSex + "<br />" + "当前的xml文件中的节点StuAge是：" + xmlStuAge + "<br />" + "当前的xml文件中的节点StuAddress是：" + xmlStuAddress);
}
}

Student1.xml文件内容：

<?xml version="1.0" encoding="utf-8"?>
<Students>
<Student>
<StuName id='1' name='lizong'>lili</StuName>
<StuSex>nan</StuSex>
<StuAge>24</StuAge>
<StuAddress>shenzhen</StuAddress>
</Student>
</Students>

 

 

把XML文件内容，通过Gridview显示

 

private void LoadGridView()
{

DataSet ds = new DataSet();
ds.ReadXml(Server.MapPath("xmltodataset.xml"));

this.GridView2.DataSource = ds;
this.GridView2.DataBind();
}

  xmltodataset.xml文件内容：

<?xml version="1.0" encoding="utf-8"?>
<students>
<student>
<id>4</id>
<name id='1' name='zhangsan'>text4</name>
<age>21</age>
</student>
<student>
<id>5</id>
<name id='1' name='zhangsan'>text5</name>
<age>22</age>
<sex>nan</sex>
</student>
<student>
<id>1</id>
<name id='1' name='zhangsan'>text1</name>
<age>18</age>
</student>
<student>
<id>2</id>
<name id='1' name='zhangsan'>text2</name>
<age>19</age>
</student>
<student>
<id>3</id>
<name id='1' name='zhangsan'>text3</name>
<age>20</age>
</student>
</students>