asp.net获取xml属性的值两种方法

private string GetAttributename(string filename, string selNodeName, string attributename)
{
string value = string.Empty;
XmlDocument doc = new XmlDocument();
doc.Load(Server.MapPath(filename));
//第一种:可根据GetElementsByTagName(节点名称)
// XmlElement root = doc.DocumentElement;
//XmlNodeList nodelist = root.GetElementsByTagName(selNodeName);
//第二种;获取当前xml文档 选中根节点的值selNodeName根节点名称
XmlNodeList nodelist =
doc.SelectSingleNode(selNodeName).ChildNodes;
foreach (XmlNode node in nodelist)
{
XmlElement xl = node as XmlElement;
value = xl.GetAttribute(attributename).ToString();
}
return value;
}