基于C#实现XML文件读取工具类
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2023-11-20 22:19:10
本文实例讲述了基于c#实现xml文件读取工具类。分享给大家供大家参考。具体如下:
这是我去年写的一个xml文件读取工具类,现在做了一些调整
基本能满足一般的xml文件...
本文实例讲述了基于c#实现xml文件读取工具类。分享给大家供大家参考。具体如下:
这是我去年写的一个xml文件读取工具类,现在做了一些调整
基本能满足一般的xml文件读取需求。
更新:
2013年6月26日19:37 fix了几个bug,为所有方法添加单元测试,并运行通过;同时调整了几个方法的位置。
/// <summary> /// author: jiangxiaoqiang /// </summary> public class xmlreader { //========================================================= // #region 获取xmldocument对象 /// <summary> /// 根据xml文件内容获取xmldocument对象 /// </summary> /// <param name="xmlfilecontent"></param> /// <returns></returns> public static xmldocument getxmldocbyxmlcontent(string xmlfilecontent) { if (string.isnullorempty(xmlfilecontent)) { return null; } var xdoc = new xmldocument(); try { xdoc.loadxml(xmlfilecontent); } catch { xdoc = null; } return xdoc; } /// <summary> /// 根据xml文件路径获取xmldocument对象 /// </summary> /// <param name="xmlfilepath"></param> /// <returns></returns> public static xmldocument getxmldocbyfilepath(string xmlfilepath) { if (string.isnullorempty(xmlfilepath) || !file.exists(xmlfilepath)) { return null; } var xdoc = new xmldocument(); try { xdoc.load(xmlfilepath); } catch { throw new exception(string.format("请确认该xml文件格式正确,路径为:{0}", xmlfilepath)); } return xdoc; } #endregion //========================================================= // //========================================================= // #region 获取xml节点(或节点列表) /// <summary> /// 获取父节点下指定节点名称的第一个子节点 /// </summary> /// <param name="parentxmlnode"></param> /// <param name="childnodename"></param> /// <returns></returns> public static xmlnode getfirstchildnodebyname(xmlnode parentxmlnode, string childnodename) { var childxmlnodes = getchildnodesbyname(parentxmlnode, childnodename); if (childxmlnodes != null && childxmlnodes.count > 0) { return childxmlnodes[0]; } return null; } /// <summary> /// 获取父节点下指定节点名称的子节点列表 /// </summary> /// <param name="parentxmlnode">父节点</param> /// <param name="nodename">节点名称</param> /// <returns></returns> public static xmlnodelist getchildnodesbyname(xmlnode parentxmlnode, string nodename) { if (parentxmlnode == null || string.isnullorempty(nodename)) { return null; } return getchildnodesbyxpathexpr(parentxmlnode, string.format(".//{0}", nodename)); } /// <summary> /// 获取父节点下满足xpathexpr表达式的xml子节点列表 /// </summary> /// <param name="parentxmlnode">父节点</param> /// <param name="xpathexpr"></param> /// <returns></returns> public static xmlnodelist getchildnodesbyxpathexpr(xmlnode parentxmlnode, string xpathexpr) { if (parentxmlnode == null || string.isnullorempty(xpathexpr)) { return null; } return parentxmlnode.selectnodes(xpathexpr); } /// <summary> /// 获取父节点下的第一个子节点 /// </summary> /// <param name="parentxmlnode"></param> /// <returns></returns> public static xmlnode getfirstchildnode(xmlnode parentxmlnode) { var childxmlnodes = getchildnodes(parentxmlnode); if (childxmlnodes != null && childxmlnodes.count > 0) { return childxmlnodes[0]; } return null; } /// <summary> /// 获取父节点的子节点列表 /// </summary> /// <param name="parentxmlnode">父节点</param> /// <returns></returns> public static xmlnodelist getchildnodes(xmlnode parentxmlnode) { return parentxmlnode == null ? null : parentxmlnode.childnodes; } #endregion //========================================================= // //========================================================= // #region 读取节点属性值 /// <summary> /// 读取某个xml节点的属性值(根据属性名) /// </summary> /// <param name="xmlnode"></param> /// <param name="attrname"></param> /// <returns></returns> public static string readattrvalue(xmlnode xmlnode, string attrname) { var xmlelement = xmlnode as xmlelement; return xmlelement == null ? null : xmlelement.getattribute(attrname); } /// <summary> /// 读取父节点下指定节点名和属性名的第一个子节点的属性值 /// </summary> /// <param name="parentxmlnode">xml父节点</param> /// <param name="childnodename">节点名称</param> /// <param name="attrname">属性名</param> /// <returns></returns> public static string readfirstattrvalue(xmlnode parentxmlnode, string childnodename, string attrname) { var attrvals = readattrvalues(parentxmlnode, childnodename, attrname); return (attrvals == null || attrvals.length == 0) ? null : attrvals[0]; } /// <summary> /// 读取父节点下指定节点名和属性名的所有子节点的该属性值的数组 /// </summary> /// <param name="parentxmlnode">xml文档</param> /// <param name="childnodename">节点名称</param> /// <param name="attrname">属性名</param> /// <returns></returns> public static string[] readattrvalues(xmlnode parentxmlnode, string childnodename, string attrname) { if (parentxmlnode == null || string.isnullorempty(childnodename) || string.isnullorempty(attrname)) { return null; } var xpathexpr = string.format("//{0}[@{1}]", childnodename, attrname); var nodes = getchildnodesbyxpathexpr(parentxmlnode, xpathexpr); if (nodes != null && nodes.count > 0) { var nodecount = nodes.count; var attrvals = new string[nodecount]; for (var i = 0; i < nodecount; i++) { attrvals[i] = ((xmlelement)nodes[i]).getattribute(attrname); } return attrvals; } return null; } #endregion //========================================================= // //========================================================= // #region 读取父节点下的子节点的文本内容 /// <summary> /// 读取父节点下指定节点名的第一个子节点的文本 /// </summary> /// <param name="parentxmlnode"></param> /// <param name="childnodename"></param> /// <returns></returns> public static string readfirstchildnodetextbyname(xmlnode parentxmlnode, string childnodename) { var childnodetexts = readchildnodetextsbyname(parentxmlnode, childnodename); if (childnodetexts != null && childnodetexts.length > 0) { return childnodetexts[0]; } return null; } /// <summary> /// 读取父节点下指定节点名的所有子节点的文本数组 /// </summary> /// <param name="parentxmlnode"></param> /// <param name="childnodename"></param> /// <returns></returns> public static string[] readchildnodetextsbyname(xmlnode parentxmlnode, string childnodename) { if (parentxmlnode == null || string.isnullorempty(childnodename)) { return null; } var xpathexpr = string.format(".//{0}", childnodename); var childnodes = getchildnodesbyxpathexpr(parentxmlnode, xpathexpr); if (childnodes != null && childnodes.count > 0) { var nodecount = childnodes.count; var nodetexts = new string[nodecount]; for (var i = 0; i < nodecount; i++) { nodetexts[i] = childnodes[i].innertext; } return nodetexts; } return null; } /// <summary> /// 读取父节点下的第一个子节点的文本 /// </summary> /// <param name="parentxmlnode"></param> /// <returns></returns> public static string readfirstchildnodetext(xmlnode parentxmlnode) { var childnodetexts = readchildnodetexts(parentxmlnode); if (childnodetexts != null && childnodetexts.length > 0) { return childnodetexts[0]; } return null; } /// <summary> /// 读取父节点下的所有子节点的文本数组 /// </summary> /// <param name="parentxmlnode"></param> /// <returns></returns> public static string[] readchildnodetexts(xmlnode parentxmlnode) { if (parentxmlnode == null) { return null; } var childnodes = getchildnodes(parentxmlnode); if (childnodes != null && childnodes.count > 0) { var nodecount = childnodes.count; var nodetexts = new string[nodecount]; for (var i = 0; i < nodecount; i++) { nodetexts[i] = childnodes[i].innertext; } return nodetexts; } return null; } /// <summary> /// 读取xml节点文本 /// </summary> /// <param name="xmlnode"></param> /// <returns></returns> public static string readnodetext(xmlnode xmlnode) { if (xmlnode == null) { return null; } return xmlnode.innertext; } #endregion //========================================================= // }
希望本文所述对大家的c#程序设计有所帮助。