转自：http://www.silverlightchina.net/html/study/WPF/2012/0808/17980.html
最近真是写博客写的不可收拾,今天再来一篇.
因为做一些程序频繁的要使用Xml,因此要频繁的写Xml读写类,这不,索性写两个通用类,把它们包装在Dll中,实现了简化Xml操作操作的目的.
现公布Xml读取和写入代码.我记得在最新的一篇博客中也提到了Xml的读取代码,这个读取代码就是以那个作为基础,更加通用,由于只是我自个测试的,难免有不完善之处,希望大家能给我指出来,我继续改进.
Xml读取类：
using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Xml; namespace XmlReaderAndWriter { public class XmlReader { private static XmlDocument doc=new XmlDocument(); private static string fileurl; //文件路径 public static string FileUrl { set{fileurl=value; } get { return fileurl; } } /// <summary> /// 载入Xml文件 /// </summary> /// <param name="url">Xml文件路径</param> public static void LoadXml(string url) { doc.Load(url); } /// <summary> /// 获取XmlDocument的根节点 /// </summary> /// <returns>返回的XmlElement元素根节点</returns> public static XmlElement GetXmlDocumentRoot() { return doc.DocumentElement; } /// <summary> /// 获取指定元素的指定Attribute值 /// </summary> /// <param name="xe">表示一个XmlElement</param> /// <param name="attr">表示Attribute的名字</param> /// <returns>返回获取的Attribute的值</returns> public static string GetAttribute(XmlElement xe, string attr) { return xe.GetAttribute(attr); } /// <summary> /// 获取指定节点的指定Attribute值 /// </summary> /// <param name="xn">表示一个XmlNode</param> /// <param name="attr"></param> /// <returns>返回获取的Attribute的值</returns> public static string GetAttribute(XmlNode xn, string attr) { XmlElement xe= ExchangeNodeElement(xn); return xe.GetAttribute(attr); } /// <summary> /// XmlElement对象转换成XmlNode对象 /// </summary> /// <param name="xe">XmlElement对象</param> /// <returns>返回XmlNode对象</returns> public static XmlNode ExchangeNodeElement(XmlElement xe) { return (XmlNode)xe; } /// <summary> /// XmlNode对象转换成XmlElement对象 /// </summary> /// <param name="xe">XmlNode对象</param> /// <returns>返回XmlElement对象</returns> public static XmlElement ExchangeNodeElement(XmlNode xn) { return (XmlElement)xn; } /// <summary> /// 获取节点的文本 /// </summary> /// <param name="xn"></param> /// <param name="nodename">节点的名称</param> /// <returns></returns> public static string GetXmlNodeInnerText(XmlNode xn,string nodename) { XmlNode childxn = xn.SelectSingleNode(nodename); return childxn.InnerText; } /// <summary> /// 获取指定节点的子节点 /// </summary> /// <param name="xn">节点对象</param> /// <returns>返回子节点数</returns> public static int GetXmlNodeCount(XmlNode xn) { return xn.ChildNodes.Count; } /// <summary> /// 获取元素的文本 /// </summary> /// <param name="xn">XmlElement元素</param> /// <param name="nodename">元素的名称</param> /// <returns></returns> public static string GetXmlElementInnerText(XmlElement xn, string nodename) { XmlNode childxn = xn.SelectSingleNode(nodename); return childxn.InnerText; } /// <summary> /// 获取XmlNode是否具有指定Attribute值 /// </summary> /// <param name="xn">XmlNode对象</param> /// <param name="attr">Attribute的名称</param> /// <param name="compare">Attribute的值</param> /// <returns>返回bool值</returns> public static bool GetXmlNodeByArrtibute(XmlNode xn, string attr, string compare) { if (GetAttribute(xn, attr) == compare) { return true; } return false; } /// <summary> /// 获取XmlElement是否具有指定Attribute值 /// </summary> /// <param name="xn">XmlElement对象</param> /// <param name="attr">Attribute的名称</param> /// <param name="compare">Attribute的值</param> /// <returns>返回bool值</returns> public static bool GetXmlNodeByArrtibute(XmlElement xe, string attr, string compare) { if (GetAttribute(xe, compare) == attr) { return true; } return false; } /// <summary> /// 获取一个具有指定Attrtibute的XmlNode子节点 /// </summary> /// <param name="xn">XmlNode对象</param> /// <param name="attr">Attrtibute的名称</param> /// <param name="compare">Attrtibute的值</param> /// <returns>返回相应的子节点</returns> public static XmlNode GetXmlChildNodeByAttrtibute(XmlNode xn, string attr, string compare) { foreach (XmlNode cxn in xn.ChildNodes) { if (GetXmlNodeByArrtibute(cxn, attr, compare)) { return cxn; } } return null; } } }
Xml写入类：
using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Xml; namespace XmlReaderAndWriter { public class XmlWriter { static XmlDocument doc = new XmlDocument(); /// <summary> /// 创建根节点 /// </summary> /// <param name="xn">根节点的名称</param> /// <returns>返回根节点</returns> public static XmlElement CreateRootElement(string xn) { XmlElement xe= doc.CreateElement(xn); doc.AppendChild(xe); return xe; } /// <summary> /// 添加一个Attribute到一个XmlElement元素 /// </summary> /// <param name="xe">被添加的XmlElement元素</param> /// <param name="attrname">Attribute的特证名</param> /// <param name="attrtext">Attribute的值</param> public static void AppendAttributeToElement(XmlElement xe,string attrname,string attrtext) { XmlAttribute xa= CreateAttribute(attrname,attrtext); xe.Attributes.Append(xa); } /// <summary> /// 添加一个Attribute到一个XmlElement元素 /// </summary> /// <param name="xe">被添加的XmlElement元素</param> /// <param name="attr">Attribute对象</param> public void AppendAttributeToElement(XmlElement xe, XmlAttribute attr) { XmlAttribute xa = attr; xe.Attributes.Append(xa); } /// <summary> /// 创建一个Attribute对象 /// </summary> /// <param name="attrname">Attribute的特证名</param> /// <param name="attrtext">Attribute的值</param> /// <returns>返回创建的Attribute对象</returns> public static XmlAttribute CreateAttribute(string attrname,string attrtext) { XmlAttribute xa=doc.CreateAttribute(attrname); xa.InnerText=attrtext; return xa; } /// <summary> /// 创建一个具有指定名称和值的节点 /// </summary> /// <param name="name">XmlNode的名称</param> /// <param name="text">XmlNode的值</param> /// <returns>返回XmlNode对象</returns> public static XmlNode CreateElement(string name, string text) { XmlNode xn= (XmlNode)doc.CreateElement(name); //创建具有指定名称的元素并转换成节点 xn.InnerText = text; //获取节点中的Text return xn; } /// <summary> /// 添加新节点到旧节点之后 /// </summary> /// <param name="oldxn">旧节点</param> /// <param name="newxn">新节点</param> public static void XmlInsertAfter(XmlNode oldxn,XmlNode newxn) { XmlNode parent = oldxn.ParentNode; //获取被添加节点的父节点 parent.InsertAfter(newxn, oldxn); //添加新节点到旧节点之后 } /// <summary> /// 添加新节点到旧节点之前 /// </summary> /// <param name="oldxn">旧节点</param> /// <param name="newxn">新节点</param> public static void XmlInsertBefore(XmlNode oldxn, XmlNode newxn) { XmlNode parent = oldxn.ParentNode; //获取被添加节点的父节点 parent.InsertBefore(newxn, oldxn);//添加新节点到旧节点之前 } /// <summary> /// 添加子节点到指定节点中 /// </summary> /// <param name="parentnode">指定的父节点</param> /// <param name="childnode">要添加进的子节点</param> public static void AppendChild(XmlNode parentnode, XmlNode childnode) { parentnode.AppendChild(childnode); } /// <summary> /// 创建Xml文件声明节点,必须要调用此方法 /// </summary> /// <param name="version">版本号，必须为1.0</param> /// <param name="encoding">字符编码</param> /// <param name="standalone">独立特性的值</param> public static void CreateXmlDeclaration(string version,string encoding, string standalone) { XmlDeclaration xd; xd=doc.CreateXmlDeclaration(version, encoding, standalone); //创建声明节点 if (doc.ChildNodes == null) //如果存在根节点 { doc.AppendChild(xd); //添加根节点 } else { XmlElement root = doc.DocumentElement; //获取文档的根节点 doc.RemoveAll(); //移除所有节点 doc.AppendChild(xd); //添加声明节点 doc.AppendChild(root); ///添加根节点 } } /// <summary> /// 移除指定的节点 /// </summary> /// <param name="childnode"></param> /// <returns>返回移除结果</returns> public static bool RemoveChildNode(XmlNode childnode) { try { XmlNode parentnode = childnode.ParentNode; //获取父节点 parentnode.RemoveChild(childnode); //移除父节点下的指定子节点 return true; } catch { return false; } } /// <summary> /// 移除所有的节点 /// </summary> /// <param name="xmlnode">节点名称</param> /// <returns></returns> public static bool RemoveChildAllNode(XmlNode xmlnode) { xmlnode.RemoveAll(); //移除所有节点 if (xmlnode.ChildNodes.Count == 0) { return true; } else { return false; } } /// <summary> /// 选择具有指定名称的一个节点 /// </summary> /// <param name="xn">父节点对象</param> /// <param name="xname">要查找节点的Name</param> /// <returns>返回查找结果</returns> public static XmlNode SelectSingleNode(XmlNode xn, string xname) { return xn.SelectSingleNode(xname); } /// <summary> /// 选择具有指定名称的多个节点 /// </summary> /// <param name="xn">父节点对象</param> /// <param name="xname">要查找节点的Name</param> /// <returns>返回查找结果</returns> public static XmlNodeList SelectNodes(XmlNode xn, string xname) { return xn.SelectNodes(xname); } /// <summary> /// 移除节点中指定的Attribute /// </summary> /// <param name="xn">XmlNode对象</param> /// <param name="xan">Attribute的名称</param> /// <returns>返回移除结果</returns> public static bool RemoveXmlAttribute(XmlNode xn,string xan) { int ac=xn.Attributes.Count; XmlNode xmlnode= xn.Attributes.RemoveNamedItem(xan); if (xmlnode.Attributes.Count == ac - 1) { return true; } else { return false; } } /// <summary> /// 移除节点中所有的Attribute /// </summary> /// <param name="xn">XmlNode对象</param> /// <returns>返回移除结果</returns> public static bool RemoveXmlAttribute(XmlNode xn) { xn.Attributes.RemoveAll(); if (xn.Attributes.Count == 0) { return true; } else { return false; } } /// <summary> /// 替换节点的值 /// </summary> /// <param name="xn">XmlNode对象</param> /// <param name="text">新的XmlNode的值</param> public static void ReplaceText(XmlNode xn, string text) { xn.InnerText = text; } /// <summary> /// 替换指定节点 /// </summary> /// <param name="nxn">新节点</param> /// <param name="oxn">正在被替换的节点</param> /// <returns>返回新节点</returns> public static XmlNode ReplaceChild(XmlNode nxn ,XmlNode oxn) { return doc.ReplaceChild(nxn, oxn); } /// <summary> /// 保存Xml文件 /// </summary> public static void SavaXml(string url) { doc.Save(url); } } }
关于Xml声明节点的创建方法，加入了一个是否有根节点(即XmlDocument中是否有子节点，因为只允许有一个根节点)判断，这是因为必须要在根节点创建之前创建声明节点,否则会提示出错.此判断可以解决这个问题,无论何时添加Xml声明节点都可以,而解决的方法就是将根节点移到声明节点的后边,具体鉴代码.如果大家仔细阅读的话相信不久就能够掌握,为了大家更好地理解特奉上一个读写示例(简单的 ),
下边是xml读写的示例:
using System; using System.Collections.Generic; using System.IO; using System.Linq; using System.Text; using System.Threading.Tasks; using XmlReaderAndWriter; namespace XmlTest { class Program { static void Main(string[] args) { Console.Write("选择读取写入操作(W/R):"); string s=Console.ReadLine(); if (s == "W") { WriteXml(); } else if (s == "R") { if(!File.Exists("xml.xml")) { Console.WriteLine("您还未写入呢"); Main(null); } ReadXml(); } else { Console.Write("请重新选择"); } Console.WriteLine("完成,按任意键继续"); Console.ReadKey(); Main(null); } static void WriteXml() { System.Xml.XmlElement root = XmlWriter.CreateRootElement("Countries"); string[] countrys = new string[] { "中国", "美国", "俄罗斯" }; for (int i = 0; i < countrys.Count(); i++) { System.Xml.XmlNode country = XmlWriter.CreateElement("Country", countrys[i]); XmlWriter.AppendAttributeToElement((System.Xml.XmlElement)country, "Name", countrys[i]); XmlWriter.AppendChild(root, country); // XmlWriter.RemoveXmlAttribute(country, "Name"); } XmlWriter.CreateXmlDeclaration("1.0", "UTF-8", null); XmlWriter.SavaXml("xml.xml"); } static void ReadXml() { XmlReader.LoadXml("xml.xml"); System.Xml.XmlElement xe = XmlReader.GetXmlDocumentRoot(); System.Xml.XmlNode xn = XmlReader.ExchangeNodeElement(xe); string s = XmlReader.GetXmlChildNodeByAttrtibute(xe, "Name", "中国").InnerText; Console.WriteLine(s); } } }
怎么样,是不是写入xml变得方便多了?(没加注释,因为很简单)此示例中特意将声明节点放在后边,也是可以正常运行的。