open System

open System.Diagnostics

open System.Net

open System.Xml

///makes a http request to the given url

let getUrlAsXml (url: string) =

  let request = WebRequest.Create(url)

  let response = request.GetResponse()

  let stream = response.GetResponseStream()

  let xml = new XmlDocument()

  xml.Load(stream)

  xml

///the url we interested in

let url = "http://feeds.bbci.co.uk/news/rss.xml"

///main application function

let main() =

  // read the rss fead

  let xml = getUrlAsXml url

  // write out the tiles of all the news items

  let nodes = xml.SelectNodes("/rss/channel/item/title")

  for i in 0 .. (nodes.Count - 1) do

    printf "%i.%s\r\n" (i+ 1) (nodes.[i].InnerText)

  // read the number the user wants from the console

  let item = int(Console.ReadLine())

  // find the new url

  let newUrl =

    let xpath = sprintf "/rss/channel/item[%i]/link" item

    let node = xml.SelectSingleNode(xpath)

    node.InnerText

  // start the url using the shell, this automaticall opens

  // the default browser

  let procStart = new ProcessStartInfo(UseShellExecute =true,

                                       FileName= newUrl)

  let proc = new Process(StartInfo = procStart)

  proc.Start() |> ignore

do main()

[

1、需要引用 System.Xml.dll

2、url 要改成：

let url = "http://feeds.bbci.co.uk/news/rss.xml"

]