C# 读写XML

using System.Xml;
try
{
//记录访问数据
String down_file = "";
String count = "";
String page = "";
XmlDocument doc = new XmlDocument();
doc.Load(Server.MapPath("~/cds/news/count.xml"));

XmlNodeList xlist = doc.SelectNodes("total");

if (xlist.Count == 1)
{
XmlElement xe = (XmlElement)xlist.Item(0);
//循环读取从XML中读到的数据
for (int j = 0; j < xe.ChildNodes.Count; j++)
{
if ((xe.ChildNodes.Item(j).Name) == "page")
{
page = xe.ChildNodes.Item(j).InnerText;
}
else if ((xe.ChildNodes.Item(j).Name) == "count_3784")
{
count = xe.ChildNodes.Item(j).InnerText;
}
else if ((xe.ChildNodes.Item(j).Name) == "down_file")
{
down_file = xe.ChildNodes.Item(j).InnerText;
}
}

}

//把每个下载累积数+1

if (down_file != null && !down_file.Equals(""))
{
down_file = System.Convert.ToString(Convert.ToInt32(down_file) + 1);
}

//记录新XML
doc.LoadXml("<?xml version='1.0' encoding='utf-8' ?>" + "<total>" + "<page>" + page + "</page>" + "<count_3784>" + count + "</count_3784>" + "<down_file>" + down_file + "</down_file>" + "</total>");

//保存新数据
doc.Save(Server.MapPath("~/cds/news/count.xml"));

}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
throw;
}