exoticpop.
New Member
I have a question regarding polling or detecting changes in XML files on websites. I have a pretty hard-coded system below that reads an XML file from the NY Fed about their daily securities lending. It's working well, and I have no issues with that. My main question is how I poll the website for changes every weekday. I understand that I can check the "Last Modified" field on the XML file (or in this case, the "Prepared" field), but I'm curious about how I go about doing this so that when a change is actually made to the XML site, my computer automatically loads and parses the new XML file. Getting this information as soon as it comes out is extremely important to me, so polling it every X minutes doesn't really work as well as I would like. Any ideas?using System;using System.Collections.Generic;using System.Linq;using System.Xml;using System.IO;using System.Xml.Linq;using System.Diagnostics;namespace ConsoleApplication2 { class Program { static void Main(string[] args) { // XML text reader stuff //XmlReader textReader = XmlReader.Create("http://www.newyorkfed.org/markets/seclend/xml/v3_0/secLendingXML.cfm"); XmlTextReader textReader = new XmlTextReader("http://www.newyorkfed.org/markets/seclend/xml/v3_0/secLendingXML.cfm"); //SyndicationFeed feed = SindicationFeed.Load(textReader); //XmlTextReader textReader = new XmlTextReader("LOCATION"); //string[] Fed_Array = new string[] {"Actual Available to Borrow", "Outstanding Loans", //"Par Submitted", "Par Accepted", "WTD Average Rate"}; int j = 0; int icount = 0; using(StreamWriter writer = new StreamWriter("LOCATION")) //using (StreamWriter writer = new StreamWriter("LOCATION")) while (textReader.Read()) { switch (textReader.NodeType) { case XmlNodeType.Element: for (int i = 0; i < textReader.AttributeCount; i++) { textReader.MoveToAttribute(i); switch (textReader.Name) { case "securityMaturityDate": string textvalmatd = textReader.Value; if (i == 0 && icount == 0) { writer.Write("N/A,"); Console.Write("N/A,"); icount = 1; i = -1; } else { writer.Write(textvalmatd + ","); Console.Write(textvalmatd + ","); icount = 0; } break; case "couponRate": string textvalcoup = textReader.Value; writer.Write(textvalcoup + ","); Console.Write(textvalcoup + ","); break; case "securityType": string textvalsec = textReader.Value; writer.Write(textvalsec + ","); Console.Write(textvalsec + ","); j = 0; break; case "value": string textval = textReader.Value; writer.Write(textval + ","); Console.Write(textval + ","); j = j + 1; if (j > 4) { writer.Write(Environment.NewLine); Console.Write(Environment.NewLine); } break; } } break; } } } private static IDisposable StreamWriter(string p) { throw new NotImplementedException(); } }}