C#读取XML文档

下面是一个读取XML文档的比较通用的方法,可以很方便地读取XML文档格式.XML文档如下:

<?xml version="1.0" encoding="utf-8" ?>
<RolesRoot ID="0"  RoleName="应用权限配置" RoleValue="" RoleUrl="" RoleMark="">
  <Roles ID="CLGL" RoleName="车辆管理" RoleValue="" RoleUrl="" RoleMark="">
    <Role ID="CLGL_CLXX" RoleName="车辆基本信息" RoleValue="" RoleUrl="车辆管理/车辆基本信息" RoleMark="">
      <RoleChild ID="" RoleName="编辑" RoleValue="" RoleUrl="" RoleMark="clbjqx"></RoleChild>
      <RoleChild ID="" RoleName="修改" RoleValue="" RoleUrl="" RoleMark="clxgqx"></RoleChild>
      <RoleChild ID="" RoleName="删除" RoleValue="" RoleUrl="" RoleMark="clscqx"></RoleChild>
    </Role>
    <Role ID="CLGL_SJXX" RoleName="司机基本信息" RoleValue="" RoleUrl="车辆管理/司机基本信息" RoleMark="">
      <RoleChild ID="" RoleName="编辑" RoleValue="" RoleUrl="" RoleMark="sjbjqx"></RoleChild>
      <RoleChild ID="" RoleName="修改" RoleValue="" RoleUrl="" RoleMark="sjxgqx"></RoleChild>
      <RoleChild ID="" RoleName="删除" RoleValue="" RoleUrl="" RoleMark="sjscqx"></RoleChild>
    </Role>
  </Roles>
  <Roles ID="HYGL" RoleName="" RoleValue="" RoleUrl="" RoleMark="">
    <Role ID="" RoleName="" RoleValue="" RoleUrl="" RoleMark=""></Role>
    <Role ID="" RoleName="" RoleValue="" RoleUrl="" RoleMark=""></Role>
    <Role ID="" RoleName="" RoleValue="" RoleUrl="" RoleMark=""></Role>
  </Roles>
</RolesRoot> 读取该文档的C#代码如下所示:

   /// <summary>
    /// 获取XML文档中元素的值
    /// </summary>
    /// <param name="parentNodePath">父级节点位置，如RolesRoot/Roles</param>
    /// <param name="childNodeName">子节点名称，如要在Role节点下找相关元素值</param>
    /// <param name="matchElementName">要进行匹配的元素名称,如通过ID元素值来找匹配</param>
    /// <param name="id">ID元素值</param>
    /// <param name="elementName">需要获取的元素名称</param>
    /// <returns></returns>
    public static string GetXmlElementValue(string parentNodePath, string childNodeName,string matchElementName, string id, string elementName)
    {
        string outPut = string.Empty;
        try
        {
            string xmlpath = ConfigurationManager.AppSettings["RolesConfig"];
            XmlDocument doc = new XmlDocument();
            doc.Load(xmlpath);

            XmlNodeList nodes = doc.SelectSingleNode(parentNodePath).ChildNodes;
            foreach (XmlElement node in nodes)
            {
                if (node.Name == childNodeName)
                {
                    if (node.Attributes[matchElementName].Value == id)
                    {
                        outPut = node.Attributes[elementName].Value;
                    }
                }
            }
        }
        catch (Exception ex)
        {
            Response.Write(ex.Message);
        }
        return outPut;
    }
上面介绍了读取一般格式的XML文档的方法,下面介绍读取特殊XML文件属性的方法,该XML文档定义了ID属性,如下:

<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE RolesRoot [
  <!ELEMENT Role ANY>
  <!ELEMENT RoleName ANY>
  <!ELEMENT RoleValue ANY>
  <!ELEMENT RoleUrl ANY>
  <!ELEMENT RoleMark ANY>
  <!ATTLIST Role RoleID ID #REQUIRED>
  <!ATTLIST RolesRoot RoleID IDREF #REQUIRED>
]>

<RolesRoot RoleID="0"  RoleName="应用权限配置" RoleValue="" RoleUrl="" RoleMark="">
  <Role RoleID="CLGL" RoleName="车辆管理" RoleValue="" RoleUrl="" RoleMark="">
    <Role RoleID="CLGL_CLXX" RoleName="车辆基本信息" RoleValue="" RoleUrl="车辆管理/车辆基本信息" RoleMark="">
      <Role RoleID="CLGL_CLXX_BJ" RoleName="编辑" RoleValue="" RoleUrl="" RoleMark="clbjqx"></Role>
      <Role RoleID="CLGL_CLXX_XG" RoleName="修改" RoleValue="" RoleUrl="" RoleMark="clxgqx"></Role>
      <Role RoleID="CLGL_CLXX_SC" RoleName="删除" RoleValue="" RoleUrl="" RoleMark="clscqx"></Role>
    </Role>
    <Role RoleID="CLGL_SJXX" RoleName="司机基本信息" RoleValue="" RoleUrl="车辆管理/司机基本信息" RoleMark="">
      <Role RoleID="" RoleName="编辑" RoleValue="" RoleUrl="" RoleMark="sjbjqx"></Role>
      <Role RoleID="" RoleName="修改" RoleValue="" RoleUrl="" RoleMark="sjxgqx"></Role>
      <Role RoleID="" RoleName="删除" RoleValue="" RoleUrl="" RoleMark="sjscqx"></Role>
    </Role>
  </Role>
</RolesRoot>我们通过ID属性读取该XML文档,获取元素的值.

    /// <summary>
    /// 通过ID获取元素值
    /// </summary>
    /// <param name="id">XML文档中定义的唯一ID属性</param>
    /// <param name="elementName">对应ID元素下要查找的元素名称</param>
    /// <returns></returns>
    public static string GetXmlElementValueById(string id, string elementName)
    {
        string outPut = string.Empty;
        try
        {
            string xmlpath = ConfigurationManager.AppSettings["RolesConfig"];
            XmlDocument doc = new XmlDocument();
            doc.Load(xmlpath);

            XmlElement elem = doc.GetElementById(id);
            outPut = elem.Attributes[elementName].Value;
        }
        catch (Exception ex)
        {
            Response.Write(ex.Message);
        }
        return outPut;
    }

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