asp.net xml操作实例小结

//打开某文件(假设web.config在根目录中)
string filename=Server.MapPath("/") + @"WebApplication1web.config";
XmlDocument xmldoc= new XmlDocument();
xmldoc.Load(filename);

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

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

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

foreach(XmlElement el in nodelist)//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);

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

XmlElement elem =xmldoc.CreateElement("add");

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

xmldoc.Save(filename);
}

<appSettings>
<add key="密码" value="admin" />
<add>ltp</add>
</appSettings>

if(element.Name.ToLower()=="appsettings")
{
XmlElement elem =xmldoc.CreateElement("add");
element.AppendChild(elem);

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

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

elem.SetAttributeNode(xa);
elem.SetAttributeNode(xa2);
xmldoc.Save(filename);
}

<appSettings>
<add key="密码" value="admin" />
<add key="ltp" value="first" />
</appSettings>

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

doc.Save(xmlfile);

string itemname=this.listBox1.SelectedItem.ToString();

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

//begin del xmlfile
XmlDocument doc=new XmlDocument();
doc.Load(xmlfile);

XmlNodeList topM=doc.DocumentElement.ChildNodes;
foreach(XmlElement element in topM)
{
if(element.Name==this.comboBox1.Text)
{

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

foreach(XmlElement el in nodelist)//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
private void Reader_Xml(string pathFlie)
{
XmlDocument Xmldoc=new XmlDocument();
Xmldoc.Load(pathFlie);
XmlNodeList Record1=Xmldoc.DocumentElement.SelectNodes(Code[@id='1'])
int f=0;
foreach(XmlNode xnode in Record1)
{
}
}
/*读取xml数据 两种xml方式*/
<aaa>
<bb>something</bb>
<cc>something</cc>
</aaa>
<aaa>
<add key="123" value="321"/>
</aaa>

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

/*第二种方法*/
<aaa>
<add key="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;
XmlDataDocument xmlDoc = new System.Xml.XmlDataDocument();
xmlDoc.Load(@"c:Config.xml");
XmlElement elem = xmlDoc.GetElementById("add");
string str = elem.Attributes["value"].Value

/*第三种方法: SelectSingleNode 读取两种格式的xml *---/
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<appSettings>
<ConnectionString>Data Source=yf; user id=ctm_dbo;password=123</ConnectionString>
</appSettings>
</configuration>

XmlDocument doc = new XmlDocument();
doc.Load(strXmlName);

XmlNode node=doc.SelectSingleNode("/configuration/appSettings/ConnectionString");
if(node!=null)
{
string k1=node.Value; //null
string k2=node.InnerText;//Data Source=yf; user id=ctm_dbo;password=123
string k3=node.InnerXml;//Data Source=yf; user id=ctm_dbo;password=123
node=null;
}

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<appSettings>
<add key="ConnectionString" value="Data Source=yf; user id=ctm_dbo;password=123" />
</appSettings>
</configuration>

XmlNode node=doc.SelectSingleNode("/configuration/appSettings/add");
if(node!=null)
{
string k=node.Attributes["key"].Value;
string v=node.Attributes["value"].Value;
node=null;
}

XmlNode node=doc.SelectSingleNode("/configuration/appSettings/add");
if(node!=null)
{
XmlNodeReader nr=new 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一个内容节点或文件结尾。
nr.MoveToAttribute("value");
string s=nr.Value;
node=null;
}