/// <summary>
/// Provides example code for the SyndicationDiscoveryUtility.ConditionalGet(Uri, DateTime, string) method
/// </summary>
public static void ConditionalGetExample()
{
Uri source = new Uri("http://www.pwop.com/feed.aspx?show=dotnetrocks&filetype=master");
DateTime lastModified;
string entityTag;
HttpWebRequest httpRequest = (HttpWebRequest)HttpWebRequest.Create(source);
httpRequest.AllowAutoRedirect = true;
httpRequest.KeepAlive = true;
httpRequest.UserAgent = "Some User Agent 1.0.0.0";
HttpWebResponse httpResponse = (HttpWebResponse)httpRequest.GetResponse();
lastModified = httpResponse.LastModified;
entityTag = httpResponse.Headers[HttpResponseHeader.ETag];
/*
* Typically the consumer would store the modification date and entity tag information for the resource,
* and some amount of time passes. Consumer can now use a conditional GET operation to determine if
* the web resource has changed since it was last retrieved. This minimizes bandwidth usage significantly.
*/
WebResponse conditionalResponse = SyndicationDiscoveryUtility.ConditionalGet(source, lastModified, entityTag);
if (conditionalResponse != null)
{
// Web resource has been modified since last retrieval, consumer would process the new data.
}
}
public static void IsTrackbackEnabledExample()
{
Uri source = new Uri("http://blog.oppositionallydefiant.com/post/SystemIOIntuition-Leveraging-human-pattern-recognition.aspx");
if (SyndicationDiscoveryUtility.IsTrackbackEnabled(source))
{
// Parse source for Trackback information
}
}
/// <summary>
/// Provides example code for the SyndicationDiscoveryUtility.UriExists(Uri) method
/// </summary>
public static void UriExistsExample()
{
Uri source = new Uri("http://blog.oppositionallydefiant.com/");
if (SyndicationDiscoveryUtility.UriExists(source))
{
// Perform some action based on source existing.
}
}
/// <summary>
/// Provides example code for the SyndicationDiscoveryUtility.SourceReferencesTarget(Uri, Uri) method
/// </summary>
public static void SourceReferencesTargetExample()
{
// Certain syndication scenarios involve verifying that one web resource references or 'links' to another web resource.
Uri source = new Uri("http://blog.oppositionallydefiant.com/post/SystemIOIntuition-Leveraging-human-pattern-recognition.aspx");
Uri target = new Uri("http://www.wikimindmap.org/");
if (SyndicationDiscoveryUtility.SourceReferencesTarget(source, target))
{
// Perform some action based on source referencing the target.
}
}
/// <summary>
/// Provides example code for the SyndicationDiscoveryUtility.SyndicationContentFormatGet(Uri) method
/// </summary>
public static void SyndicationContentFormatGetExample()
{
SyndicationContentFormat format = SyndicationContentFormat.None;
Uri url = new Uri("http://feeds.feedburner.com/HanselminutesCompleteMP3?format=xml");
format = SyndicationDiscoveryUtility.SyndicationContentFormatGet(url);
if (format != SyndicationContentFormat.None)
{
// Do something based on the determined content format
}
}
//============================================================
// PUBLIC METHODS
//============================================================
#region ProcessRequest(HttpContext context)
/// <summary>
/// Enables processing of HTTP Web requests for syndicated content.
/// </summary>
/// <param name="context">
/// An <see cref="HttpContext"/> object that provides references to the intrinsic server objects
/// (for example, <b>Request</b>, <b>Response</b>, <b>Session</b>, and <b>Server</b>) used to service HTTP requests.
/// </param>
/// <exception cref="ArgumentNullException">The <paramref name="context"/> is a null reference (Nothing in Visual Basic).</exception>
public void ProcessRequest(HttpContext context)
{
//------------------------------------------------------------
// Local members
//------------------------------------------------------------
ISyndicationResource syndicationResource = null;
//------------------------------------------------------------
// Validate parameter
//------------------------------------------------------------
Guard.ArgumentNotNull(context, "context");
//------------------------------------------------------------
// Initialize handler state using query string parameters
//------------------------------------------------------------
if (context.Request.QueryString["format"] != null && !String.IsNullOrEmpty(context.Request.QueryString["format"]))
{
SyndicationContentFormat format = SyndicationDiscoveryUtility.SyndicationContentFormatByName(context.Request.QueryString["format"]);
if (format != SyndicationContentFormat.None)
{
this.Format = format;
}
}
if (context.Request.QueryString["id"] != null && !String.IsNullOrEmpty(context.Request.QueryString["id"]))
{
this.Id = context.Request.QueryString["id"];
}
//------------------------------------------------------------
// Get syndication resource using provider model
//------------------------------------------------------------
if (this.Id != null)
{
syndicationResource = SyndicationManager.GetResource(this.Id);
}
else if (this.Format != SyndicationContentFormat.None)
{
Collection <ISyndicationResource> resources = SyndicationManager.GetResources(this.Format);
if (resources != null && resources.Count > 0)
{
syndicationResource = resources[0];
}
}
//------------------------------------------------------------
// Write syndication resource data and header details
//------------------------------------------------------------
if (syndicationResource != null)
{
this.WriteResource(context, syndicationResource);
}
}
public static void LocateTrackbackNotificationServersExample()
{
Uri source = new Uri("http://blog.oppositionallydefiant.com/post/SystemIOIntuition-Leveraging-human-pattern-recognition.aspx");
Collection <TrackbackDiscoveryMetadata> endpoints = SyndicationDiscoveryUtility.LocateTrackbackNotificationServers(source);
foreach (TrackbackDiscoveryMetadata endpoint in endpoints)
{
Argotic.Net.TrackbackClient client = new Argotic.Net.TrackbackClient(endpoint.PingUrl);
Argotic.Net.TrackbackMessage message = new Argotic.Net.TrackbackMessage();
// Build Trackback url-encoded message to be sent
client.Send(message);
}
}
public static void LocatePingbackNotificationServerExample()
{
Uri source = new Uri("http://blog.oppositionallydefiant.com/post/SystemIOIntuition-Leveraging-human-pattern-recognition.aspx");
Uri pingbackServer = SyndicationDiscoveryUtility.LocatePingbackNotificationServer(source);
if (pingbackServer != null)
{
Argotic.Net.XmlRpcClient client = new Argotic.Net.XmlRpcClient(pingbackServer);
Argotic.Net.XmlRpcMessage message = new Argotic.Net.XmlRpcMessage();
// Build the Pingback XML-RPC message to be sent
client.Send(message);
}
}
/// <summary>
/// Provides example code for the SyndicationDiscoveryUtility.LocateDiscoverableSyndicationEndpoints(Uri) method
/// </summary>
public static void LocateDiscoverableSyndicationEndpointsExample()
{
Uri source = new Uri("http://www.dotnetrocks.com/");
Collection <DiscoverableSyndicationEndpoint> endpoints;
endpoints = SyndicationDiscoveryUtility.LocateDiscoverableSyndicationEndpoints(source);
foreach (DiscoverableSyndicationEndpoint endpoint in endpoints)
{
if (endpoint.ContentFormat == SyndicationContentFormat.Rss)
{
RssFeed feed = RssFeed.Create(endpoint.Source);
if (feed.Channel.HasExtensions)
{
// Process feed extensions
}
}
}
}