读写xml所有节点个人小结 和 读取xml节点的数据总结

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

//得到顶层节点列表
XmlNodeListtopM=xmldoc.DocumentElement.ChildNodes;
foreach(XmlElementelementintopM)
{
if(element.Name.ToLower()=="appsettings")
{

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

if(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);

在某节点下增加一个元素,并设置值:

if(element.Name.ToLower()=="appsettings")
{

XmlElementelem
=xmldoc.CreateElement("add");

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

xmldoc.Save(filename);

}


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

在某节点下增加一个元素,并增加两个属性:
if(element.Name.ToLower()=="appsettings")
{

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);

删除一个节点元素
stringitemname=this.listBox1.SelectedItem.ToString();

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

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

XmlNodeListtopM
=doc.DocumentElement.ChildNodes;
foreach(XmlElementelementintopM)
{
if(element.Name==this.comboBox1.Text)
{

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

foreach(XmlElementelinnodelist)//读元素值
{
if(el.Attributes["key"].Value==itemname)
{
element.RemoveChild(el);
}


}
//循环元素

}
//得到组

}
//循环组

doc.Save(xmlfile);
//一定要保存一下,否则不起作用

//筛选数据
privatevoidReader_Xml(stringpathFlie)
{
XmlDocumentXmldoc
=newXmlDocument();
Xmldoc.Load(pathFlie);
XmlNodeListRecord1
=Xmldoc.DocumentElement.SelectNodes(Code[@id='1'])
intf=0;
foreach(XmlNodexnodeinRecord1)
{

}

}

/**/ /*读取xml数据两种xml方式*/
< aaa >
< bb > something </ bb >
< cc > something </ cc >
</ aaa >

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

/**/ /*第一种方法*/
DS.ReadXml(
" yourxmlfilename " );
Container.DataItem(
" bb " );
Container.DataItem(
" cc " );
DS.ReadXmlSchema(
" yourxmlfilename " );

/**/ /*第二种方法*/
< aaa >
< addkey = " 123 " value = " 321 " />
</ aaa >
如果我要找到123然后取到321应该怎么写呢?

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


/**/ /*第三种方法:SelectSingleNode读取两种格式的xml*---/
--------------------------------------------------------------------
<?xmlversion="1.0"encoding="utf-8"?>
<configuration>
<appSettings>
<ConnectionString>DataSource=yf;userid=ctm_dbo;password=123</ConnectionString>
</appSettings>
</configuration>
--------------------------------------------------------------------------
XmlDocumentdoc=newXmlDocument();
doc.Load(strXmlName);

XmlNodenode=doc.SelectSingleNode("/configuration/appSettings/ConnectionString");
if(node!=null)
{
stringk1=node.Value;//null
stringk2=node.InnerText;//DataSource=yf;userid=ctm_dbo;password=123
stringk3=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");
if(node!=null)
{
stringk=node.Attributes["key"].Value;
stringv=node.Attributes["value"].Value;
node=null;
}
*--------------------------------------------------------------------*
XmlNodenode=doc.SelectSingleNode("/configuration/appSettings/add");
if(node!=null)
{
XmlNodeReadernr=newXmlNodeReader(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一个内容节点或文件结尾。
nr.MoveToAttribute("value");
strings=nr.Value;
node=null;
}

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