static IList testXmlDocument()
{
var doc =new XmlDocument();
doc.Load(xmlStream);
var nodeList = doc.DocumentElement.ChildNodes;
var lstChannel =new List<Object>(nodeList.Count );
foreach (XmlNode node in nodeList)
{
var channel =new
{
Title = node.SelectSingleNode("title").InnerText,
Link = node.SelectSingleNode("link").InnerText,
Description = node.SelectSingleNode("description").InnerText,
Content = node.SelectSingleNode("content").InnerText,
PubDate = node.SelectSingleNode("pubDate").InnerText,
Author = node.SelectSingleNode("author").InnerText,
Category = node.SelectSingleNode("category").InnerText
};
lstChannel.Add(channel);
}
return lstChannel;
}

static IList testXmlNavigator()
{
var doc =new XmlDocument();
doc.Load(xmlStream);
var nav = doc.CreateNavigator();
nav.MoveToRoot();
var nodeList = nav.Select("/channel/item");
var lstChannel =new List<Object>(nodeList.Count);
foreach (XPathNavigator node in nodeList)
{
var channel =new
{
Title = node.SelectSingleNode("title").Value,
Link = node.SelectSingleNode("link").Value,
Description = node.SelectSingleNode("description").Value,
Content = node.SelectSingleNode("content").Value,
PubDate = node.SelectSingleNode("pubDate").Value,
Author = node.SelectSingleNode("author").Value,
Category = node.SelectSingleNode("category").Value
};
lstChannel.Add(channel);
}
return lstChannel;
}

static List<Channel> testXmlReader()
{
var lstChannel =new List<Channel>();
var reader = XmlReader.Create(xmlStream);
while (reader.Read())
{
if (reader.Name =="item"&& reader.NodeType == XmlNodeType.Element)
{
var channel =new Channel();
lstChannel.Add(channel);
while (reader.Read())
{
if (reader.Name =="item") break;
if (reader.NodeType != XmlNodeType.Element) continue;
switch (reader.Name)
{
case"title":
channel.Title = reader.ReadString();
break;
case"link":
channel.Link = reader.ReadString();
break;
case"description":
channel.Description = reader.ReadString();
break;
case"content":
channel.Content = reader.ReadString();
break;
case"pubDate":
channel.PubDate = reader.ReadString();
break;
case"author":
channel.Author = reader.ReadString();
break;
case"category":
channel.Category = reader.ReadString();
break;
default:
break;
}
}
}
}
return lstChannel;
}

static IList testXmlLinq()
{
var xd = XDocument.Load(xmlStream);
var list = from node in xd.Elements("channel").Descendants("item")
select new
{
Title = node.Element("title").Value,
Link = node.Element("link").Value,
Description = node.Element("description").Value,
Content = node.Element("content").Value,
PubDate = node.Element("pubDate").Value,
Author = node.Element("author").Value,
Category = node.Element("category").Value
};
return list.ToList();
}