针对XML文件的操作是C#程序设计中非常常见的功能。本文即以实例展示了C#操作XML文件的几个常见的示例。具体如下：

1.返回节点下标

public static XmlDocument getDoc(String path)//加载xml文档{ XmlDocument doc = new XmlDocument(); doc.Load(path); return doc;} /// <summary>/// 返回找到的节点下标/// </summary>/// <param name="path">xml文件路径</param>/// <param name="bname">书名</param>/// <returns></returns>public static int getPosition(String path,string node, String bname){ int i; XmlDocument doc = new XmlDocument(); doc.Load(path); XmlNodeList nodeList = doc.SelectSingleNode(node).ChildNodes; for (i = 0; i < nodeList.Count; i++) { if (nodeList[i].ChildNodes[0].InnerText == bname) { return i; } } return -1;}

2.遍历数据

/// <summary>/// 遍历数据/// </summary>/// <param name="sender"></param>/// <param name="e"></param>protected void btnRead_Click(object sender, EventArgs e){ XmlDocument doc = getDoc("books.xml");//加载xml文档，books文件存放于 foreach (XmlElement root in doc.DocumentElement.ChildNodes)//遍历根的子节点 { Response.Write("<script>document.write('<br/>');</script>"); Response.Write("<script>document.write('" + root.Name + "');</script>");//节点名root.Name book foreach (XmlElement item in root.ChildNodes) { Response.Write("<script>document.write('" + item.Name + "'+':'+'" + item.InnerText + "');</script>");//输出节点名和文本节点的值 Response.Write("<script>document.write('<br/>');</script>"); } }}

3.查找

/// <summary>/// 查找/// </summary>/// <param name="path">文件路径</param>/// <param name="node">节点</param>/// <param name="bname">查找关键字</param>/// <returns>XmlNode</returns>public static XmlNode Find(string path,string node,string bname){ XmlDocument doc = new XmlDocument(); doc.Load(path);//加载xml文档 XmlNodeList nodeList = doc.SelectSingleNode(node).ChildNodes; int i = getPosition(path, node, bname);// if (i >= 0) return nodeList[i]; else return null;}

4.删除节点

/// <summary>/// 删除元素、属性/// </summary>/// <param name="path">文件</param>/// <param name="node">指定节点的父节点</param>/// <param name="attribute">为空时删除节点，否则删除属性</param>/// <param name="bname"></param>public static void Delete(string path,string node,string attribute,string bname){ XmlDocument doc = new XmlDocument(); doc.Load(path); XmlNode root = doc.SelectSingleNode(node); XmlNodeList nodeList = doc.SelectSingleNode(node).ChildNodes; int i = getPosition(path, node, bname);//返回指定的节点下标 if (i >= 0) { if (attribute.Equals("")) { root.RemoveChild(nodeList[i]); } else { XmlElement xn = (XmlElement)nodeList[i]; xn.RemoveAttribute(attribute); } } doc.Save(path);}

5.添加

/// <summary>/// 添加元素值/// </summary>/// <param name="path"></param>/// <param name="node"></param>/// <param name="element"></param>/// <param name="value"></param>/// <param name="i">插入的下标，如果为负，默认从最后一个节点插入</param>/// <returns></returns>public static bool Add(string path,string node,string element,string value,int i){ XmlDocument doc = new XmlDocument(); doc.Load(path); XmlNodeList nodeList = doc.SelectNodes(node); XmlNode newNode = doc.SelectSingleNode(node).LastChild; if (i < 0 || i > nodeList.Count-1)//如果小于0或者大于节点长度，默认从最后一个节点添加 { XmlElement newElement = doc.CreateElement(element);//创建元素 newElement.InnerText = value;//赋值 newNode.AppendChild(newElement); } else { XmlElement newElement = doc.CreateElement(element); newElement.InnerText = value; nodeList[i - 1].AppendChild(newElement); } doc.Save(path); return true;}

希望本文所述方法对大家的C#程序设计能有所帮助。