linq to xml 操作sitemap

刚开始用xml去做没有弄好，折腾了好久成功了，先仓促的记一下

protected void btnAdd_Click(object sender, EventArgs e)
{
XElement els = XElement.Load(Server.MapPath(@"~\Student\stu.sitemap"));
XNamespace siteNM = "http://schemas.microsoft.com/AspNet/SiteMap-File-1.0";
XElement eTemp = els.Element(siteNM + "siteMapNode");
var elements = from el in eTemp.Elements(siteNM + "siteMapNode")
where (string)el.Attribute("title") == "课堂学习"
select el;
XElement keTang = null;
foreach (var el in elements)
{
keTang = el;
}
keTang.Add(new XElement(siteNM + "siteMapNode", new XAttribute("url", txtUrl.Text), new XAttribute("title", txtName.Text), new XAttribute("description", ""), new XAttribute("roles", "0")));
els.Save(Server.MapPath(@"~\Student\stu.sitemap"));
}

XElement els = XElement.Load(Server.MapPath(@"~\Student\stu.sitemap"));
XNamespace siteNM = "http://schemas.microsoft.com/AspNet/SiteMap-File-1.0";
XElement eTemp = els.Element(siteNM + "siteMapNode");
var elements = from el in eTemp.Elements(siteNM + "siteMapNode")
where (string)el.Attribute("title") == "课堂学习"
select el;
XElement keTang = null;
foreach (var el in elements)
{
keTang = el;
}
var del = from el in keTang.Elements(siteNM + "siteMapNode")
where (string)el.Attribute("title") == txtName.Text
select el;
XElement delXElement = null;
foreach (var ell in del)
delXElement = ell;

if (delXElement != null)
delXElement.Remove();

els.Save(Server.MapPath(@"~\Student\stu.sitemap"));