读写xml所有节点个人小结和读取xml节点的数据总结

今天药忘吃喽~ 2022-02-02 07:23 201阅读 0赞

![None.gif][]读：  
![None.gif][] // 打开某文件(假设web.config在根目录中)   
![None.gif][] string filename=Server.MapPath("/") + @"WebApplication1\\web.config";  
![None.gif][] XmlDocument xmldoc= new XmlDocument();  
![None.gif][] xmldoc.Load(filename);  
![None.gif][]  
![None.gif][] // 得到顶层节点列表   
![None.gif][] XmlNodeList topM=xmldoc.DocumentElement.ChildNodes;  
![None.gif][] foreach(XmlElement element in topM)  
![ExpandedBlockStart.gif][] ![ContractedBlock.gif][] ![dot.gif][] \{  
![InBlock.gif][] if(element.Name.ToLower()=="appsettings")  
![ExpandedSubBlockStart.gif][] ![ContractedSubBlock.gif][] ![dot.gif][]\{  
![InBlock.gif][]  
![InBlock.gif][] // 得到该节点的子节点   
![InBlock.gif][] XmlNodeList nodelist=element.ChildNodes;  
![InBlock.gif][]  
![InBlock.gif][] if ( nodelist.Count >0 )  
![ExpandedSubBlockStart.gif][] ![ContractedSubBlock.gif][] ![dot.gif][]\{  
![InBlock.gif][] // DropDownList1.Items.Clear();   
![InBlock.gif][]  
![InBlock.gif][] foreach(XmlElement el in nodelist) // 读元素值   
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][] ![dot.gif][]\{  
![InBlock.gif][] // DropDownList1.Items.Add(el.Attributes\["key"\].InnerXml);  
![InBlock.gif][] // this.TextBox2.Text=el.Attributes\["key"\].InnerText;   
![InBlock.gif][] this.TextBox2.Text=el.Attributes\["key"\].Value;  
![InBlock.gif][] this.Label1.Text=el.Attributes\["value"\].Value;  
![InBlock.gif][]  
![InBlock.gif][]  
![InBlock.gif][] // 同样在这里可以修改元素值,在后面save。  
![InBlock.gif][] //  el.Attributes\["value"\].Value=this.TextBox2.Text;   
![ExpandedSubBlockEnd.gif][] \}  
![InBlock.gif][]  
![InBlock.gif][]  
![ExpandedSubBlockEnd.gif][] \}  
![InBlock.gif][]  
![ExpandedSubBlockEnd.gif][] \}  
![InBlock.gif][]  
![ExpandedBlockEnd.gif][] \}  
![None.gif][]  
![None.gif][] xmldoc.Save(filename);  
![None.gif][]  
![None.gif][]在某节点下增加一个元素，并设置值：  
![None.gif][]  
![None.gif][] if(element.Name.ToLower()=="appsettings")  
![ExpandedBlockStart.gif][] ![ContractedBlock.gif][] ![dot.gif][] \{  
![InBlock.gif][]  
![InBlock.gif][] XmlElement elem =xmldoc.CreateElement("add");  
![InBlock.gif][]  
![InBlock.gif][] element.AppendChild(elem);  
![InBlock.gif][] elem.InnerText="ltp";  
![InBlock.gif][]  
![InBlock.gif][] xmldoc.Save(filename);  
![InBlock.gif][]  
![ExpandedBlockEnd.gif][] \}  
![None.gif][]  
![None.gif][]效果：  
![None.gif][] <appSettings>  
![None.gif][] <add key="密码" value="admin" />  
![None.gif][] <add>ltp</add>  
![None.gif][] </appSettings>  
![None.gif][]  
![None.gif][]在某节点下增加一个元素，并增加两个属性：  
![None.gif][] if(element.Name.ToLower()=="appsettings")  
![ExpandedBlockStart.gif][] ![ContractedBlock.gif][] ![dot.gif][] \{  
![InBlock.gif][]  
![InBlock.gif][] XmlElement elem =xmldoc.CreateElement("add");  
![InBlock.gif][] element.AppendChild(elem);  
![InBlock.gif][]  
![InBlock.gif][] XmlAttribute xa=xmldoc.CreateAttribute("key");  
![InBlock.gif][] xa.Value="ltp";  
![InBlock.gif][]  
![InBlock.gif][] XmlAttribute xa2=xmldoc.CreateAttribute("value");  
![InBlock.gif][] xa2.Value="first";  
![InBlock.gif][]  
![InBlock.gif][] elem.SetAttributeNode(xa);  
![InBlock.gif][] elem.SetAttributeNode(xa2);  
![InBlock.gif][]  
![InBlock.gif][]  
![InBlock.gif][] xmldoc.Save(filename);  
![InBlock.gif][]  
![ExpandedBlockEnd.gif][] \}  
![None.gif][]  
![None.gif][]效果：  
![None.gif][] <appSettings>  
![None.gif][] <add key="密码" value="admin" />  
![None.gif][] <add key="ltp" value="first" />  
![None.gif][] </appSettings>  
![None.gif][]  
![None.gif][] // 添加空元素：   
![None.gif][] XmlNode node=doc.CreateElement(groupname);  
![None.gif][] node.InnerText="";  
![None.gif][] doc.LastChild.AppendChild(node);  
![None.gif][]  
![None.gif][] doc.Save(xmlfile);  
![None.gif][]  
![None.gif][]删除一个节点元素  
![None.gif][] string itemname= this.listBox1.SelectedItem.ToString();  
![None.gif][]  
![None.gif][] this.listBox1.Items.Remove( this.listBox1.SelectedItem);  
![None.gif][]  
![None.gif][] // begin del xmlfile   
![None.gif][] XmlDocument doc= new XmlDocument();  
![None.gif][] doc.Load(xmlfile);  
![None.gif][]  
![None.gif][] XmlNodeList topM=doc.DocumentElement.ChildNodes;  
![None.gif][] foreach(XmlElement element in topM)  
![ExpandedBlockStart.gif][] ![ContractedBlock.gif][] ![dot.gif][] \{  
![InBlock.gif][] if(element.Name== this.comboBox1.Text)  
![ExpandedSubBlockStart.gif][] ![ContractedSubBlock.gif][] ![dot.gif][]\{  
![InBlock.gif][]  
![InBlock.gif][] // 得到该节点的子节点   
![InBlock.gif][] XmlNodeList nodelist=element.ChildNodes;  
![InBlock.gif][]  
![InBlock.gif][] foreach(XmlElement el in nodelist) // 读元素值   
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][] ![dot.gif][]\{  
![InBlock.gif][] if(el.Attributes\["key"\].Value==itemname)  
![ExpandedSubBlockStart.gif][] ![ContractedSubBlock.gif][] ![dot.gif][]\{  
![InBlock.gif][] element.RemoveChild(el);  
![ExpandedSubBlockEnd.gif][] \}  
![InBlock.gif][]  
![ExpandedSubBlockEnd.gif][] \} // 循环元素   
![InBlock.gif][]  
![ExpandedSubBlockEnd.gif][] \} // 得到组   
![InBlock.gif][]  
![ExpandedBlockEnd.gif][] \} // 循环组   
![None.gif][]  
![None.gif][] doc.Save(xmlfile); // 一定要保存一下，否则不起作用  
![None.gif][]  
![None.gif][] // 筛选数据   
![None.gif][] private void Reader\_Xml( string pathFlie)  
![ExpandedBlockStart.gif][] ![ContractedBlock.gif][] ![dot.gif][] \{  
![InBlock.gif][] XmlDocument Xmldoc= new XmlDocument();  
![InBlock.gif][] Xmldoc.Load(pathFlie);  
![InBlock.gif][] XmlNodeList Record1=Xmldoc.DocumentElement.SelectNodes(Code\[@id='1'\])  
![InBlock.gif][] int f=0;  
![InBlock.gif][] foreach(XmlNode xnode in Record1)  
![ExpandedSubBlockStart.gif][] ![ContractedSubBlock.gif][] ![dot.gif][]\{  
![InBlock.gif][]  
![ExpandedSubBlockEnd.gif][] \}  
![ExpandedBlockEnd.gif][]\}

![ExpandedBlockStart.gif][] ![ContractedBlock.gif][] /\*\*/ /\* 读取xml数据 两种xml方式 \*/  
![None.gif][]<aaa>  
![None.gif][] <bb>something</bb>  
![None.gif][] <cc>something</cc>  
![None.gif][]</aaa>  
![None.gif][]  
![None.gif][]<aaa>  
![None.gif][] <add key="123" value="321"/>  
![None.gif][]</aaa>  
![None.gif][]  
![ExpandedBlockStart.gif][] ![ContractedBlock.gif][] /\*\*/ /\* 第一种方法 \*/  
![None.gif][]DS.ReadXml("your xmlfile name");  
![None.gif][]Container.DataItem("bb");  
![None.gif][]Container.DataItem("cc");  
![None.gif][]DS.ReadXmlSchema("your xmlfile name");  
![None.gif][]  
![ExpandedBlockStart.gif][] ![ContractedBlock.gif][] /\*\*/ /\* 第二种方法 \*/  
![None.gif][]<aaa>  
![None.gif][] <add key="123" value="321"/>  
![None.gif][]</aaa>  
![None.gif][]如果我要找到123然后取到321应该怎么写呢？  
![None.gif][]  
![None.gif][] using System.XML;  
![None.gif][]XmlDataDocument xmlDoc = new System.Xml.XmlDataDocument();  
![None.gif][]xmlDoc.Load(@"c:\\Config.xml");  
![None.gif][]XmlElement elem = xmlDoc.GetElementById("add");  
![None.gif][] string str = elem.Attributes\["value"\].Value  
![None.gif][]  
![None.gif][]  
![ExpandedBlockStart.gif][] ![ContractedBlock.gif][] /\*\*/ /\* 第三种方法: SelectSingleNode 读取两种格式的xml \*---/  
![InBlock.gif][]\--------------------------------------------------------------------  
![InBlock.gif][]<?xml version="1.0" encoding="utf-8" ?>  
![InBlock.gif][]<configuration>  
![InBlock.gif][] <appSettings>  
![InBlock.gif][] <ConnectionString>Data Source=yf; user id=ctm\_dbo;password=123</ConnectionString>  
![InBlock.gif][] </appSettings>  
![InBlock.gif][]</configuration>  
![InBlock.gif][]\--------------------------------------------------------------------------  
![InBlock.gif][]XmlDocument doc = new XmlDocument();  
![InBlock.gif][]doc.Load(strXmlName);  
![InBlock.gif][]  
![InBlock.gif][] XmlNode node=doc.SelectSingleNode("/configuration/appSettings/ConnectionString");  
![InBlock.gif][] if(node!=null)  
![InBlock.gif][] \{  
![InBlock.gif][] string k1=node.Value; //null  
![InBlock.gif][] string k2=node.InnerText;//Data Source=yf; user id=ctm\_dbo;password=123  
![InBlock.gif][] string k3=node.InnerXml;//Data Source=yf; user id=ctm\_dbo;password=123  
![InBlock.gif][] node=null;  
![InBlock.gif][] \}  
![InBlock.gif][]  
![InBlock.gif][]\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*  
![InBlock.gif][]<?xml version="1.0" encoding="utf-8" ?>  
![InBlock.gif][]<configuration>  
![InBlock.gif][] <appSettings>  
![InBlock.gif][] <add key="ConnectionString" value="Data Source=yf; user id=ctm\_dbo;password=123" />  
![InBlock.gif][] </appSettings>  
![InBlock.gif][]</configuration>  
![InBlock.gif][]\*\*--------------------------------------------------------------------\*\*  
![InBlock.gif][] XmlNode node=doc.SelectSingleNode("/configuration/appSettings/add");  
![InBlock.gif][] if(node!=null)  
![InBlock.gif][] \{  
![InBlock.gif][] string k=node.Attributes\["key"\].Value;  
![InBlock.gif][] string v=node.Attributes\["value"\].Value;  
![InBlock.gif][] node=null;  
![InBlock.gif][] \}  
![InBlock.gif][]\*--------------------------------------------------------------------\*  
![InBlock.gif][] XmlNode node=doc.SelectSingleNode("/configuration/appSettings/add");  
![InBlock.gif][] if(node!=null)  
![InBlock.gif][] \{  
![InBlock.gif][] XmlNodeReader nr=new XmlNodeReader(node);  
![InBlock.gif][] nr.MoveToContent();  
![InBlock.gif][] //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。  
![InBlock.gif][] nr.MoveToAttribute("value");  
![InBlock.gif][] string s=nr.Value;  
![InBlock.gif][] node=null;  
![InBlock.gif][] \}  
![InBlock.gif][]  
![InBlock.gif][]

本文转自高海东博客园博客，原文链接：http://www.cnblogs.com/ghd258/archive/2005/12/03/290034.html，如需转载请自行联系原作者

[None.gif]: /images/20220202/34bb55c1af2d4d4290291e1333b2d22a.png
[ExpandedBlockStart.gif]: http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif
[ContractedBlock.gif]: /images/20220202/e0e33a8405804c1a897f19a82197887c.png
[dot.gif]: /images/20220202/fcae5a3317b145ffad986e7d4288741c.png
[InBlock.gif]: /images/20220202/782daf6d64b04faebb1b931f8d78e6b0.png
[ExpandedSubBlockStart.gif]: http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif
[ContractedSubBlock.gif]: http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif
[ExpandedSubBlockEnd.gif]: /images/20220202/f573cb367a9d4409b0f6d74ffbed5fea.png
[ExpandedBlockEnd.gif]: /images/20220202/2716391b298a4f11ba7a34c9fe2bc3d0.png