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。
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