在.net的项目开发中，经常会对XML文件进行操作，由于XML文件可以实现跨平台传输，较多的应用在数据传输中，特总结以下几种常用的XML操作方法：

1.创建XML文档：

/// <summary> /// 创建XML文档 /// </summary> /// <param name="name">根节点名称</param> /// <param name="type">根节点的一个属性值</param> /// <returns>XmlDocument对象</returns> public static XmlDocument CreateXmlDocument(string name, string type) { XmlDocument doc; try { doc = new XmlDocument(); doc.LoadXml("<" + name + "/>"); var rootEle = doc.DocumentElement; rootEle"type", type); } catch (Exception er) { throw new Exception(er.ToString()); } return doc; }

2.读取XML文档中的数据：

/// <summary> /// 读取数据 /// </summary> /// <param name="path">路径</param> /// <param name="node">节点</param> /// <param name="attribute">属性名，非空时返回该属性值，否则返回串联值</param> /// <returns>string</returns> public static string Read(string path, string node, string attribute) { var value = ""; try { var doc = new XmlDocument(); doc.Load(path); var xn = doc.SelectSingleNode(node); if (xn != null && xn.Attributes != null) value = (attribute.Equals("") ? xn.InnerText : xn.Attributes[attribute].Value); } catch (Exception er) { throw new Exception(er.ToString()); } return value; }

3.对XML文档插入数据：

/// <summary> /// 插入数据 /// </summary> /// <param name="path">路径</param> /// <param name="node">节点</param> /// <param name="element">元素名，非空时插入新元素，否则在该元素中插入属性</param> /// <param name="attribute">属性名，非空时插入该元素属性值，否则插入元素值</param> /// <param name="value">值</param> /// <returns></returns> public static void Insert(string path, string node, string element, string attribute, string value) { try { var doc = new XmlDocument(); doc.Load(path); var xn = doc.SelectSingleNode(node); if (element.Equals("")) { if (!attribute.Equals("")) { var xe = (XmlElement)xn; xe?.SetAttribute(attribute, value); //xe?.SetAttribute(attribute, value); } } else { var xe = doc.CreateElement(element); if (attribute.Equals("")) xe.InnerText = value; else xe.SetAttribute(attribute, value); xn?.AppendChild(xe); } doc.Save(path); } catch (Exception er) { throw new Exception(er.ToString()); } }

4.修改XML文档中的数据：

/// <summary> /// 修改数据 /// </summary> /// <param name="path">路径</param> /// <param name="node">节点</param> /// <param name="attribute">属性名，非空时修改该节点属性值，否则修改节点值</param> /// <param name="value">值</param> /// <returns></returns> public static void Update(string path, string node, string attribute, string value) { try { var doc = new XmlDocument(); doc.Load(path); var xn = doc.SelectSingleNode(node); var xe = (XmlElement)xn; if (attribute.Equals("")) { if (xe != null) xe.InnerText = value; } else { xe?.SetAttribute(attribute, value); } doc.Save(path); } catch (Exception er) { throw new Exception(er.ToString()); } }

5.删除XML文档中数据：

/// <summary> /// 删除数据 /// </summary> /// <param name="path">路径</param> /// <param name="node">节点</param> /// <param name="attribute">属性名，非空时删除该节点属性值，否则删除节点值</param> /// <returns></returns> public static void Delete(string path, string node, string attribute) { try { var doc = new XmlDocument(); doc.Load(path); var xn = doc.SelectSingleNode(node); var xe = (XmlElement)xn; if (attribute.Equals("")) { xn?.ParentNode?.RemoveChild(xn); } else { xe?.RemoveAttribute(attribute); } doc.Save(path); } catch (Exception er) { throw new Exception(er.ToString()); } }

6.读取XML文档中指定节点数据：

/// <summary> /// 获得xml文件中指定节点的节点数据 /// </summary> /// <param name="path"></param> /// <param name="nodeName"></param> /// <returns></returns> public static string GetNodeInfoByNodeName(string path, string nodeName) { var xmlString = string.Empty; try { var xml = new XmlDocument(); xml.Load(path); var root = xml.DocumentElement; if (root == null) return xmlString; var node = root.SelectSingleNode("//" + nodeName); if (node != null) { xmlString = node.InnerText; } } catch (Exception er) { throw new Exception(er.ToString()); } return xmlString; }

7.获取XML指定节点的属性：

/// <summary> /// 功能:读取指定节点的指定属性值 /// </summary> /// <param name="path"></param> /// <param name="strNode">节点名称</param> /// <param name="strAttribute">此节点的属性</param> /// <returns></returns> public string GetXmlNodeAttributeValue(string path, string strNode, string strAttribute) { var strReturn = ""; try { var xml = new XmlDocument(); xml.Load(path); //根据指定路径获取节点 var xmlNode = xml.SelectSingleNode(strNode); if (xmlNode != null) { //获取节点的属性，并循环取出需要的属性值 var xmlAttr = xmlNode.Attributes; if (xmlAttr == null) return strReturn; for (var i = 0; i < xmlAttr.Count; i++) { if (xmlAttr.Item(i).Name != strAttribute) continue; strReturn = xmlAttr.Item(i).Value; break; } } } catch (XmlException xmle) { throw new Exception(xmle.Message); } return strReturn; }

8.设置XML文档中指定节点的属性：

/// <summary> /// 功能:设置节点的属性值 /// </summary> /// <param name="path"></param> /// <param name="xmlNodePath">节点名称</param> /// <param name="xmlNodeAttribute">属性名称</param> /// <param name="xmlNodeAttributeValue">属性值</param> public void SetXmlNodeAttributeValue(string path, string xmlNodePath, string xmlNodeAttribute, string xmlNodeAttributeValue) { try { var xml = new XmlDocument(); xml.Load(path); //可以批量为符合条件的节点的属性付值 var xmlNode = xml.SelectNodes(xmlNodePath); if (xmlNode == null) return; foreach (var xmlAttr in from XmlNode xn in xmlNode select xn.Attributes) { if (xmlAttr == null) return; for (var i = 0; i < xmlAttr.Count; i++) { if (xmlAttr.Item(i).Name != xmlNodeAttribute) continue; xmlAttr.Item(i).Value = xmlNodeAttributeValue; break; } } } catch (XmlException xmle) { throw new Exception(xmle.Message); } }

9.读取XML文档指定节点的值：

/// <summary> /// 读取XML资源中的指定节点内容 /// </summary> /// <param name="source">XML资源</param> /// <param name="xmlType">XML资源类型：文件，字符串</param> /// <param name="nodeName">节点名称</param> /// <returns>节点内容</returns> public static object GetNodeValue(string source, XmlType xmlType, string nodeName) { var xd = new XmlDocument(); if (xmlType == XmlType.File) { xd.Load(source); } else { xd.LoadXml(source); } var xe = xd.DocumentElement; XmlNode xn = null; if (xe != null) { xn= xe.SelectSingleNode("//" + nodeName); } return xn.InnerText; }

10.更新XML文档指定节点的内容：

/// <summary> /// 更新XML文件中的指定节点内容 /// </summary> /// <param name="filePath">文件路径</param> /// <param name="nodeName">节点名称</param> /// <param name="nodeValue">更新内容</param> /// <returns>更新是否成功</returns> public static bool UpdateNode(string filePath, string nodeName, string nodeValue) { try { bool flag; var xd = new XmlDocument(); xd.Load(filePath); var xe = xd.DocumentElement; if (xe == null) return false; var xn = xe.SelectSingleNode("//" + nodeName); if (xn != null) { xn.InnerText = nodeValue; flag = true; } else { flag = false; } return flag; } catch (Exception ex) { throw new Exception(ex.Message); } } 复制代码 11.将对象转化为XML文件，并存入指定目录： 复制代码 /// <summary> /// 将对象转化为xml，并写入指定路径的xml文件中 /// </summary> /// <typeparam name="T">C#对象名</typeparam> /// <param name="item">对象实例</param> /// <param name="path">路径</param> /// <param name="jjdbh">标号</param> /// <param name="ends">结束符号（整个xml的路径类似如下：C:xmltest201111send.xml，其中path=C:xmltest,jjdbh=201111,ends=send）</param> /// <returns></returns> public static string WriteXml<T>(T item, string path, string jjdbh, string ends) { if (string.IsNullOrEmpty(ends)) { //默认为发送 ends = "send"; } //控制写入文件的次数 var i = 0; //获取当前对象的类型，也可以使用反射typeof(对象名) var serializer = new XmlSerializer(item.GetType()); //xml的路径组合 object[] obj = { path, "", jjdbh, ends, ".xml" }; var xmlPath = string.Concat(obj); while (true) { try { //用filestream方式创建文件不会出现“文件正在占用中，用File.create”则不行 var fs = System.IO.File.Create(xmlPath); fs.Close(); TextWriter writer = new StreamWriter(xmlPath, false, Encoding.UTF8); var xml = new XmlSerializerNamespaces(); xml.Add(string.Empty, string.Empty); serializer.Serialize(writer, item, xml); writer.Flush(); writer.Close(); break; } catch (Exception) { if (i < 5) { i++; continue; } break; } } return SerializeToXmlStr<T>(item, true); }

12.向一个已经存在的父节点中插入一个子节点：

/// <summary> /// 向一个已经存在的父节点中插入一个子节点 /// </summary> /// <param name="path"></param> /// <param name="parentNodePath">父节点</param> /// <param name="childnodename">子节点名称</param> public void AddChildNode(string path, string parentNodePath, string childnodename) { try { var xml = new XmlDocument(); xml.Load(path); var parentXmlNode = xml.SelectSingleNode(parentNodePath); XmlNode childXmlNode = xml.CreateElement(childnodename); if ((parentXmlNode) != null) { //如果此节点存在 parentXmlNode.AppendChild(childXmlNode); } else { //如果不存在就放父节点添加 GetXmlRoot(path).AppendChild(childXmlNode); } } catch (XmlException xmle) { throw new Exception(xmle.Message); } }

以上的方法总结采用.net4.5版本和c#6.0语法，希望对大家的学习有所帮助，也希望大家多多支持查字典教程网。