读写xml个人小结

读:
//打开某文件(假设web.config在根目录中)
filename=Server.MapPath(\"/\")+@\"WebApplication1\\web.config\";
XmlDocumentxmldoc=XmlDocument;
xmldoc.Load(filename);

//得到顶层节点列表
XmlNodeListtopM=xmldoc.DocumentElement.ChildNodes;
foreach(XmlElementelementopM)
{
(element.Name.ToLower\"apptings\")
{

//得到该节点子节点
XmlNodeListnodelist=element.ChildNodes;

(nodelist.Count>0)
{
//DropDownList1.Items.Clear;

foreach(XmlElementelinnodelist)//读元素值
{
//DropDownList1.Items.Add(el.Attributes[\"key\"].InnerXml);
//this.TextBox2.Text=el.Attributes[\"key\"].InnerText;
this.TextBox2.Text=el.Attributes[\"key\"].Value;
this.Label1.Text=el.Attributes[\"value\"].Value;


//同样在这里可以修改元素值,在后面save
//el.Attributes[\"value\"].Value=this.TextBox2.Text;
}


}

}

}

xmldoc.Save(filename);

在某节点下增加个元素并设置值:

(element.Name.ToLower\"apptings\")
{

XmlElementelem=xmldoc.CreateElement(\"add\");

element.AppendChild(elem);
elem.InnerText=\"ltp\";

xmldoc.Save(filename);


}


效果: [Page]
<appSettings>
<addkey=\"密码\"value=\"admin\"/>
<add>ltp</add>
</appSettings>


在某节点下增加个元素并增加两个属性:
(element.Name.ToLower\"apptings\")
{

XmlElementelem=xmldoc.CreateElement(\"add\");
element.AppendChild(elem);


XmlAttributexa=xmldoc.CreateAttribute(\"key\");
xa.Value=\"ltp\";

XmlAttributexa2=xmldoc.CreateAttribute(\"value\");
xa2.Value=\"first\";

elem.SetAttributeNode(xa);
elem.SetAttributeNode(xa2);


xmldoc.Save(filename);


}

效果:
<appSettings>
<addkey=\"密码\"value=\"admin\"/>
<addkey=\"ltp\"value=\"first\"/>
</appSettings>


//添加空元素:
XmlNodenode=doc.CreateElement(groupname);
node.InnerText=\"\";
doc.LastChild.AppendChild(node);

doc.Save(xmlfile);

删除个节点元素
itemname=this.listBox1.SelectedItem.;


this.listBox1.Items.Remove(this.listBox1.SelectedItem);

//begindelxmlfile
XmlDocumentdoc=XmlDocument;
doc.Load(xmlfile);


XmlNodeListtopM=doc.DocumentElement.ChildNodes;
foreach(XmlElementelementopM)
{
(element.Namethis.comboBox1.Text)


{

//得到该节点子节点
XmlNodeListnodelist=element.ChildNodes;

foreach(XmlElementelinnodelist)//读元素值
{ [Page]
(el.Attributes[\"key\"].Valueitemname)
{
element.RemoveChild(el);
}


}//循环元素

}//得到组

}//循环组


doc.Save(xmlfile);//定要保存下否则不起作用



//筛选数据
privatevoidReader_Xml(pathFlie)
{
XmlDocumentXmldoc=XmlDocument;
Xmldoc.Load(pathFlie);
XmlNodeListRecord1=Xmldoc.DocumentElement.SelectNodes(Code[@id=’1’])
f=0;
foreach(XmlNodexnodeinRecord1)
{

}
}

读取xml节点数据整理总结
/*读取xml数据两种xml方式*/
<aaa>
<bb>something</bb>
<cc>something</cc>
</aaa>

<aaa>
<addkey=\"123\"value=\"321\"/>
</aaa>

/*第种思路方法*/
DS.ReadXml(\"yourxmlfilename\");
Container.DataItem(\"bb\");
Container.DataItem(\"cc\");
DS.ReadXmlSchema(\"yourxmlfilename\");

/*第 2种思路方法*/
<aaa>
<addkey=\"123\"value=\"321\"/>
</aaa>
如果我要找到123然后取到321应该如何写呢？

using.XML;
XmlDataDocumentxmlDoc=.Xml.XmlDataDocument;
xmlDoc.Load(@\"c:\\Config.xml\");
XmlElementelem=xmlDoc.GetElementById(\"add\");
str=elem.Attributes[\"value\"].Value


/*第 3种思路方法:SelectSingleNode读取两种格式xml*---/
--------------------------------------------------------------------
<?xmlversion=\"1.0\"encoding=\"utf-8\"?>
<configuration>
<appSettings>
<ConnectionString>DataSource=yf;userid=ctm_dbo;password=123</ConnectionString>
</appSettings>
</configuration>
--------------------------------------------------------------------------
XmlDocumentdoc=XmlDocument; [Page]
doc.Load(strXmlName);

XmlNodenode=doc.SelectSingleNode(\"/configuration/appSettings/ConnectionString\");
(node!=null)
{
k1=node.Value;//null
k2=node.InnerText;//DataSource=yf;userid=ctm_dbo;password=123
k3=node.InnerXml;//DataSource=yf;userid=ctm_dbo;password=123
node=null;
}

********************************************************************
<?xmlversion=\"1.0\"encoding=\"utf-8\"?>
<configuration>
<appSettings>
<addkey=\"ConnectionString\"value=\"DataSource=yf;userid=ctm_dbo;password=123\"/>
</appSettings>
</configuration>
**--------------------------------------------------------------------**
XmlNodenode=doc.SelectSingleNode(\"/configuration/appSettings/add\");
(node!=null)
{
k=node.Attributes[\"key\"].Value;
v=node.Attributes[\"value\"].Value;
node=null;
}
*--------------------------------------------------------------------*
XmlNodenode=doc.SelectSingleNode(\"/configuration/appSettings/add\");
(node!=null)


{
XmlNodeReadernr=XmlNodeReader(node);
nr.MoveToContent;
//检查当前节点是否是内容节点如果此节点不是内容节点则读取器向前跳至下个内容节点或文件结尾
nr.MoveToAttribute(\"value\");
s=nr.Value;
node=null;
}

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