Part IV in .NET

Build qrcode in .NET Part IV
Part IV
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Understanding Silverlight Frameworks
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TABLE 14.3
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Properties of the SyndicationFeed Class
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Property Description
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AttributeExtensions BaseUri Description ElementExtensions Items LastUpdateTime Links Title
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Dictionary. Specifies additional attributes for the feed. Uri. Specifies the base URI for the feed.
String. Provides a description of the feed.
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Dictionary. Specifies additional attributes for the feed. List<SyndicationItem>. List of SyndicationItem objects in the feed. DateTimeOffset. Specifies the last time the feed was updated. Collection<SyndicationLink>. Collection of SyndicationLink objects.
String. Specifies the title of the feed.
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The SyndicationItem class provides functionality to work with individual items in the feed. SyndicationItem classes represent an RSS <item> or an Atom <entry> element. Table 14.4 lists some of the important property variables of SyndicationItem class objects.
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TABLE 14.4
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Properties of the SyndicationItem Class
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Property Description
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AttributeExtensions BaseUri Content ElementExtensions Links PublishedDate SourceFeed Summary
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Dictionary. Specifies additional attributes for the feed item. Uri. Specifies the base URI for the feed item.
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String. Specifies the SyndicationContent object that is associated with this item.
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Dictionary. Specifies additional attributes for the feed item. Collection<SyndicationLink>. Collection of SyndicationLink objects associated with the item. DateTimeOffset. Specifies the date that the item was published. SyndicationFeed. Specifies the SyndicationFeed object this item belongs to.
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TextSyndicationContent. Specifies a summary of the content of the item.
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The SyndicationContent class is actually an abstract for the following content classes: n TextSyndicationContent: SyndicationContent class that provides content to SyndicationItem classes as HTML, XHTML, or plain text.
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n UrlSyndicationContent: SyndicationContent class that provides content to SyndicationItem classes as a URL that points to another resource. n XmlSyndicationContent: SyndicationContent class that provides content to SyndicationItem classes as XML data. This type of content is not intended to be displayed in a Web browser. The code in Listings 14.7 and 14.8 shows an example Silverlight application that implements an RSS feed. The code in Listing 14.7 defines a simple interface with a Button control, getBtn, to initiate retrieval of the RSS feed. A ListBox control, titleList, is defined in a ScrollViewer to store a list of feed item titles. A TextBlock, feedSummary is defined in a ScrollViewer to display the Summary attribute of a list item. A TextBlock, dateText is defined to display the publication date of the feed item.
LISTING 14.7
Page.xaml File That Defines an Interface to Retrieve and Display the Summaries of Items in an RSS Feed
<UserControl x:Class= RssFeedsApp.Page xmlns= http://schemas.microsoft.com/client/2007 xmlns:x= http://schemas.microsoft.com/winfx/2006/xaml Width= 640 Height= 300 > <Grid x:Name= LayoutRoot Background= LightBlue > <TextBlock Text= RSS Feed Items HorizontalAlignment= Left Margin= 100,10 /> <TextBlock Text= Item Summary HorizontalAlignment= Right Margin= 110,10 /> <ScrollViewer Background= White Height= 200 Width= 280 VerticalAlignment= Top HorizontalAlignment= Left Margin= 20, 40 > <ListBox x:Name= titleList /> </ScrollViewer> <ScrollViewer Background= White Height= 200 Width= 280 VerticalAlignment= Top HorizontalAlignment= Right Margin= 0,40,20,0 > <TextBlock x:Name= feedSummary TextWrapping= Wrap /> </ScrollViewer> <Button x:Name= getBtn Content= Get Feed VerticalAlignment= Bottom HorizontalAlignment= Left
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Part IV
Understanding Silverlight Frameworks
LISTING 14.7
(continued)
Margin= 20 Height= 30 Width= 100 /> <TextBlock x:Name= dateText Text= Published: VerticalAlignment= Bottom HorizontalAlignment= Left Margin= 340, 0, 0, 30 /> </Grid> </UserControl>
The code in Listing 14.6 first implements the System.Net library for the HttpWebRequest class, the System.Xml library for the XmlReader class, and the System.ServiceModel. Syndication library for the SyndicationFeed and SyndicationItem classes. Inside the Page() constructor, the code attaches a Click event handler, doGetFeed(), to the getBtn control defined in Listing 14.7. The code also attaches a SelectionChanged event handler, doShowSummary(), to the titleList Listbox. Inside the doGetFeed()event handler, an HttpWebRequest object, request, is created using the following code:
HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(new Uri(feedURL));
NOTE
The URL specified by the feedURL argument when creating the HttpWebRequest points to an aspx file located in the same project as the code in Listings 14.7 and 14.8. If you try to access an RSS feed that is across domains, the RSS server needs to implement a cross-domain policy as discussed earlier in this chapter.
Once the HttpWebRequest object is created, the code uses the following code to send the request and wait for the response in the AsyncCallback handler function responseHandler():
request.BeginGetResponse(new AsyncCallback(responseHandler), request);
Inside the responseHandler() function, the code uses the following lines of code to get the request from the IAsyscResult argument asyncResult and create an HttpWebResponse object response:
HttpWebRequest request = (HttpWebRequest)asyncResult.AsyncState; HttpWebResponse response = (HttpWebResponse)request.EndGetResponse(asyncResult);
The code uses the GetResponseStream() function of the response object to read the XML data from the RSS feed into an XmlReader object reader. The contents of the RSS feed are read as XML and loaded into the SyndicationFeed object rssFeed using the following code: