C#下读取xml节点的数据总结.doc

读：/打开某文件(假设web.config在根目录中)stringfilename=Server.MapPath(/)+WebApplication1web.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.Count0)/DropDownList1.Items.Clear();foreach(XmlElementelinnodelist)/读元素值/DropDownList1.Items.Add(el.Attributeskey.InnerXml);/this.TextBox2.Text=el.Attributeskey.InnerText;this.TextBox2.Text=el.Attributeskey.Value;this.Label1.Text=el.Attributesvalue.Value;/同样在这里可以修改元素值,在后面save。/el.Attributesvalue.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：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/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);/begindelxmlfileXmlDocumentdoc=newXmlDocument();doc.Load(xmlfile);XmlNodeListtopM=doc.DocumentElement.ChildNodes;foreach(XmlElementelementintopM)if(element.Name=boBox1.Text)/得到该节点的子节点XmlNodeListnodelist=element.ChildNodes;foreach(XmlElementelinnodelist)/读元素值if(el.Attributeskey.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(Codeid=1)intf=0;foreach(XmlNodexnodeinRecord1)/*/*/*/*读取xml数据两种xml方式*/something/bbsomething/cc/aaa/aaa/*/*/*/*第一种方法*/DS.ReadXml(yourxmlfilename);Container.DataItem(bb);Container.DataItem(cc);DS.ReadXmlSchema(yourxmlfilename);/*/*/*/*第二种方法*/aaa如果我要找到123然后取到321应该怎么写呢？usingSystem.XML;XmlDataDocumentxmlDoc=newSystem.Xml.XmlDataDocument();xmlDoc.Load(c:Config.xml);XmlElementelem=xmlDoc.GetElementById(add);stringstr=elem.Attributesvalue.Value/*/*/*/*第三种方法:SelectSingleNode读取两种格式的xml*-/-DataSource=yf;userid=ctm_dbo;password=123-XmlDocumentdoc=newXmlDocument();doc.Load(strXmlName);XmlNodenode=doc.SelectSingleNode(/configuration/appSettings/ConnectionString);if(node!=null)stringk1=node.Value;/nullstringk2=node.InnerText;/DataSource=yf;userid=ctm_dbo;password=123stringk3=node.InnerXml;/DataSource=yf;userid=ctm_dbo;password=123node=null;*-*XmlNodenode=doc.SelectSingleNode(/configuration/appSettings/add);if(node!=null)stringk=node.Attributeskey.Value;stringv=node.Attributesvalue.Value;node=null;*-*XmlNodenode=doc.SelectSingleNode(/configuration/appSettings/add);if(node!=null)