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:

<? xmlversion="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:

<? xmlversion="1.0"encoding="utf-8" ?>
<! DOCTYPERolesRoot[
<!ELEMENTRoleANY >
<! ELEMENTRoleNameANY >
<! ELEMENTRoleValueANY >
<! ELEMENTRoleUrlANY >
<! ELEMENTRoleMarkANY >
<! ATTLISTRoleRoleIDID#REQUIRED >
<! ATTLISTRolesRootRoleIDIDREF#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;
}