ASP.NET RSS Toolkit

New Post: RssHttpHandlerBase.cs

gcthompson — Thu, 26 Jun 2008 16:23:31 GMT

Is there a good reason why ProcessRequest isn't virtual?

I don't see a way to retrieve the query parameters without overriding it and calling the base function in my handler

It could just be that i'm missing something of course and stepping outside of the .NET patterns box ..

NEW POST: Sort problem

pash — Wed, 04 Jun 2008 12:38:26 GMT

Hi.
i met strange problem consuming rss: http://www.finextra.com/rss/channel.asp?channel=cards
In browser rss is displayed with sorting by date
But when i use RssDataSource or RssDocument sorting order is reverse thus recent news go at bottom.
I tried to use rss.SelectItems(5,true/false) but received the same result.

Can someone help me with this problem?

Thanx in advance.

Patch Uploaded

HeroicLife — Mon, 26 May 2008 00:04:05 GMT

HeroicLife has uploaded a patch.

Description:
This patch contains various fixes suggested in the discussions and issues list. Also, I removed the default namespaces from XmlSerializer.
I have referenced specific work items in the code.

NEW POST: Updates for the next version of RSS Toolkit

HeroicLife — Fri, 23 May 2008 03:31:22 GMT

RSS Toolkit has a number of outstanding bugs and issues, and the current developers told me that they don't have time to work on it right now.

They suggested that I submit the changes for the next release, so am I doing just that. I am currently going through the discussions and issues and collecting various changes and fixes. If you have something to submit, and want to make sure that it's included, please contact me or post it below.

NEW POST: The Futur of ASP.NET RSS Toolkit

HeroicLife — Fri, 23 May 2008 03:13:28 GMT

I emailed the coordinators, and they suggested that I send them a patch set.

I am currently going through the discussions and issues and collecting various changes and fixes. If anyone would like to send me suggested changes (or post them below), I'll be sure to include them.

COMMENTED ISSUE: Updates Needed to Fix Support for Atom Feeds

urbandude — Wed, 14 May 2008 15:59:35 GMT

Symptoms when consuming Atom feeds:
- <pubDate/> is empty
- <link/> links to the <channel/> URL and not the <item/> URL

Fixes in AtomToRss20.xsl
- LINE 25: <xsl:value-of select="//*[name()='modified']"/> should be <xsl:value-of select="//*[name()='updated']"/>
- LINE 43: <xsl:value-of select="//*[name()='link']/@href"/>should be <xsl:value-of select="child::*[name()='link']/@href"/>
- LINE 55: <xsl:value-of select="//*[name()='modified']"/> should be <xsl:value-of select="//*[name()='updated']"/>

Attached is a compiled version that incorporates these changes.
Comments: ** Comment from web user: urbandude **

thanks for that!

COMMENTED ISSUE: PubDateParsed is inefficient

ericrod — Mon, 12 May 2008 21:10:54 GMT

PubDateParsed recompiles the rfc2822 regular expression on every call. Compiling regular expressions is very costly and when PubDateParsed is within a loop, there are major performance issues.

A quick fix is to make the regular expression an array of RssXmlHelper.
Comments: ** Comment from web user: ericrod **

JIT compilation occurs every time Match() is called in the PubDateParsed getter, and the compiled regular expression is never cached. The compiled regex will be cached if the static method for RegEx.Match() is called instead.

NEW POST: Generated RSS is not recognized as RSS feed By most browsers !

mjda — Mon, 05 May 2008 07:42:34 GMT

Edit boldRssHttpHandlerBase.csbold and change
boldcontext.Response.ContentType = "text/xml";bold
for
boldcontext.Response.ContentType = "application/rss+xml";bold
On line 104 (give 1 or take 1 line).

Regards,
Manuel Alves

NEW POST: Problem getting response from hosting company

ad5qa — Tue, 29 Apr 2008 03:21:38 GMT

This works fine locally but when I upload it I get the below error in trace.axd. Any suggestions?

Trace.axd Dump:
The remote name could not be resolved: 'twitter.com'
at System.Net.HttpWebRequest.GetResponse()
at System.Xml.XmlDownloadManager.GetNonFileStream(Uri uri, ICredentials credentials)
at System.Xml.XmlDownloadManager.GetStream(Uri uri, ICredentials credentials)
at System.Xml.XmlUrlResolver.GetEntity(Uri absoluteUri, String role, Type ofObjectToReturn)
at System.Xml.XmlTextReaderImpl.OpenUrlDelegate(Object xmlResolver)

COMMENTED ISSUE: Add Error Handling inside Toolkit

dreamlusion — Tue, 15 Apr 2008 22:45:56 GMT

If the feed the toolkit is connecting to goes down or is moved, a 404 error will result; similarly, if the server hosting the feed is having problems a 500 error can result. Either of these two scenarios will result in an error being thrown and the page consuming the RSStoolkit data will fail. This renders the entire page unusable, where ideally the toolkit would provide an elegant fail-over handler that would allow the non-RSStoolkit portions of the page to load with some sort of error condition notification in the RSStoolkit areas.
Comments: ** Comment from web user: dreamlusion **

@blueocean this is not a commercial product. I even appreciate the fact that it exists.

CREATED ISSUE: PubDateParsed is inefficient

mcalliph — Fri, 11 Apr 2008 16:17:39 GMT

NEW POST: how to catch exception

huela — Wed, 02 Apr 2008 19:58:53 GMT

I have RssToolkit to do the RssFeed. I could catch exception if the feed is not exist RssToolkit throw exception. then I could handle the errors.

But, I had one feed http://xml.weather.yahoo.com/forecastrss?p=USPA0081&u=f
it won't throw exception and give back the xml files. But I think the date is not match my system.
So it always give me error:
he string was not recognized as a valid DateTime. There is a unknown word starting at index 25.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.FormatException: The string was not recognized as a valid DateTime. There is a unknown word starting at index 25.

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:

FormatException: The string was not recognized as a valid DateTime. There is a unknown word starting at index 25.
System.DateTimeParse.Parse(String s, DateTimeFormatInfo dtfi, DateTimeStyles styles) +2291962
System.DateTime.Parse(String s, IFormatProvider provider) +26
RssToolkit.Rss.RssXmlHelper.Parse(String dateTime) +1455
RssToolkit.Rss.RssItem.get_PubDateParsed() +36
Microsoft.Xml.Serialization.GeneratedAssembly.XmlSerializationWriterRssDocument.Write8_RssItem(String n, String ns, RssItem o, Boolean isNullable, Boolean needType) +815
Microsoft.Xml.Serialization.GeneratedAssembly.XmlSerializationWriterRssDocument.Write13_RssChannel(String n, String ns, RssChannel o, Boolean isNullable, Boolean needType) +923
Microsoft.Xml.Serialization.GeneratedAssembly.XmlSerializationWriterRssDocument.Write14_RssDocument(String n, String ns, RssDocument o, Boolean isNullable, Boolean needType) +302
Microsoft.Xml.Serialization.GeneratedAssembly.XmlSerializationWriterRssDocument.Write15_rss(Object o) +125

InvalidOperationException: There was an error generating the XML document.
System.Xml.Serialization.XmlSerializer.Serialize(XmlWriter xmlWriter, Object o, XmlSerializerNamespaces namespaces, String encodingStyle, String id) +647
System.Xml.Serialization.XmlSerializer.Serialize(XmlWriter xmlWriter, Object o, XmlSerializerNamespaces namespaces, String encodingStyle) +43
System.Xml.Serialization.XmlSerializer.Serialize(XmlWriter xmlWriter, Object o, XmlSerializerNamespaces namespaces) +39
System.Xml.Serialization.XmlSerializer.Serialize(TextWriter textWriter, Object o, XmlSerializerNamespaces namespaces) +93
System.Xml.Serialization.XmlSerializer.Serialize(TextWriter textWriter, Object o) +35
RssToolkit.Rss.RssXmlHelper.ToRssXml(T rssDocument) +249
RssToolkit.Rss.RssDocumentBase.ToXml(DocumentType outputType, T rssDocument) +75
RssToolkit.Rss.RssDocument.ToXml(DocumentType outputType) +35
RssToolkit.Rss.RssDocument.ToDataSet() +29
RssToolkit.Rss.RssDocument.SelectItems(Int32 maxItems, Boolean reverseOrder) +51
RssToolkit.Rss.RssDocument.SelectItems(Int32 maxItems) +32
RssToolkit.Web.Design.RssDataSourceView.ExecuteSelect(DataSourceSelectArguments arguments) +59
System.Web.UI.WebControls.BaseDataList.GetData() +54
System.Web.UI.WebControls.DataList.CreateControlHierarchy(Boolean useDataSource) +381
System.Web.UI.WebControls.BaseDataList.OnDataBinding(EventArgs e) +75
System.Web.UI.WebControls.BaseDataList.DataBind() +85
System.Web.UI.WebControls.BaseDataList.EnsureDataBound() +82
System.Web.UI.WebControls.BaseDataList.CreateChildControls() +91
System.Web.UI.Control.EnsureChildControls() +133
System.Web.UI.Control.PreRenderRecursiveInternal() +109
System.Web.UI.Control.PreRenderRecursiveInternal() +233
System.Web.UI.Control.PreRenderRecursiveInternal() +233
System.Web.UI.Control.PreRenderRecursiveInternal() +233
System.Web.UI.Control.PreRenderRecursiveInternal() +233
System.Web.UI.Control.PreRenderRecursiveInternal() +233
System.Web.UI.Control.PreRenderRecursiveInternal() +233
System.Web.UI.Control.PreRenderRecursiveInternal() +233
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +4421

I try to use try catch block. But it didn't go into catch block.

Anybody knows how do I catch exception and handle it ???
Appreciate

COMMENTED ISSUE: Add Error Handling inside Toolkit

blueocean — Sun, 30 Mar 2008 06:40:47 GMT

Same problem. Sometimes I get this error message: "An existing connection was forcibly closed by the remote host." This happens on the page which is consuming the RSS.

I'm very curious why there are still no error handling on this component till date!

CREATED ISSUE: Generated RSS is not valid

Salar — Thu, 27 Mar 2008 04:39:03 GMT

The feeds validator reports some error for generated RSS document.
http://feedvalidator.org/

The most worst error is "Use of unknown namespace: http://www.w3.org/2001/XMLSchema-instance" and Use of unknown namespace: http://www.w3.org/2001/XMLSchema

CREATED ISSUE: Generated rss bad content encoding

Salar — Wed, 26 Mar 2008 19:58:03 GMT

The generated RSS xml document has Unicode encoding and Firefox can't read the document.
I have taken a look at the source codes and found that this problem is because of StringWriter which its default encoding is Unicode.
So I have changed that code and it works (In "AspNetRssToolkit-V2.0-Sources" package).
In the RssXmlHelper.cs class, the ToRssXml<T> method:

public static string ToRssXml<T>(T rssDocument) where T : RssDocumentBase
{
if (rssDocument == null)
{
throw new ArgumentNullException("rssDocument");
}

using (MemoryStream mem = new MemoryStream())
{
XmlSerializer serializer = new XmlSerializer(typeof(T));
serializer.Serialize(mem, rssDocument);

mem.Capacity = Convert.ToInt32(mem.Length);
return Encoding.UTF8.GetString(mem.GetBuffer());
}

//using (StringWriter output = new StringWriter(new StringBuilder(), CultureInfo.InvariantCulture))
//{
// XmlSerializer serializer = new XmlSerializer(typeof(T));
// serializer.Serialize(output, rssDocument);
// return output.ToString();
//}
}

CREATED ISSUE: Add Error Handling inside Toolkit

joelevi — Mon, 24 Mar 2008 21:56:33 GMT

NEW POST: Aggregating RSS feeds, is it possible?

jwendl — Mon, 24 Mar 2008 18:50:32 GMT

Check out the OpmlDocument class. It will generate a feed if used in combination with the RssDocument.Load method.

NEW POST: Paging with RSS Toolkit

jwendl — Mon, 24 Mar 2008 18:49:30 GMT

You can use the PagedDataSource class as long as you are on .NET 2.0 or greater. http://www.devhood.com/tutorials/tutorialdetails.aspx?tutorialid=97 has a good example of it.

NEW POST: Paging with RSS Toolkit

radiogeneris — Sat, 22 Mar 2008 19:31:49 GMT

This code loads all data from RSS feed:

//TODO: Load here only page number pageIndex, load only numRows for that page
//Now it is loading all records!
d = RssToolkit.Rss.RssDocument.Load(new Uri(url));
dv1 = (DataView)d.SelectItems();

I would like to load only specific page of data, so not all data are loaded. What if RSS Feed has 10,000 rows??? How to do it? Here is my whole method for loading data:

DataTable GetDataSource(string keyWord, int pageIndex, int numRows)
{
DataTable retValue = new DataTable();
XmlDocument xDoc = new XmlDocument();
xDoc.Load(Server.MapPath(_xmlUrlsFileName));

XmlNode xNode = xDoc.SelectSingleNode("RSSURLS");
foreach (XmlNode xUrlNode in xNode.ChildNodes)
{
string url = string.Format(xUrlNode.Attributes"URL".Value, keyWord);
RssToolkit.Rss.RssDocument d;
DataView dv1;
try
{
//TODO: Load here only page number pageIndex, load only numRows for that page
//Now it is loading all records!
d = RssToolkit.Rss.RssDocument.Load(new Uri(url));
dv1 = (DataView)d.SelectItems();
}
catch { continue; }
if (retValue.Rows.Count == 0)
{
retValue = dv1.Table.Copy();
retValue.PrimaryKey = null;
}
else
{
foreach (DataRow dr in dv1.Table.Rows)
{
retValue.ImportRow(dr);
}
}
}

return retValue;
}

NEW POST: how to create rss feed with prefixed namespace

ioue — Fri, 21 Mar 2008 04:57:18 GMT

Thank you akayau!

I could define custom namespaces!!