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Whenever a user tries to play a media file, you use a WebClient to invoke the GetCaptionsForMedia() WCF service operation. In the DownloadStringCompleted handler, you check to see if any caption definitions were returned. If there is a valid return from the operation, you perform a LINQ query on the returned XML to extract a collection of the marker values and corresponding XAML fragments. You then save each XAML entry representing a caption into a Dictionary named dictCaptions, keyed with the marker value for later access. After this is done, you start playing the media by setting MediaElement.Source. As the media plays and markers are reached, you handle the MarkerReached event, using the MainVideo_MarkerReached() event handler. Let s look at the if block of the if-else statement in the handler. If the TimelineMarker being reached has a Text property value that corresponds to a key in dictCaptions, you first clear the CaptionContainer. You then load the XAML fragment using XamlReader.Load(). You can find more about XamlReader in 2. When the XAML is loaded, you cast it to a FrameworkElement and add it to CaptionContainer. Using the FrameworkElement base type allows you to use any FrameworkElement derivative in the XAML fragment, and not just a Canvas as it was defined in the XAML fragment. You then acquire the Storyboard named STBD_AnimateCaption from the FrameworkElement.Resources collection and start it. In the Storyboard.Completed handler, you clear the CaptionContainer after the animation completes.

N ote The clearing of the CaptionContainer at the beginning of the if block is for cases where a marker may be

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1. Introduction 2. Question about recent project candidate worked on 3. Easy programming question 4. Pointer/recursion question 5. Are you satisfied 6. Do you have any questions I am very, very careful to avoid anything that might give me some preconceived notions about the candidate. If you think that someone is smart before they even walk into the room, just because they have a PhD from MIT, then nothing they can say in one hour is going to overcome that initial prejudice. If you think they are a bozo because they went to community college, nothing they can say will overcome that initial impression. An interview is like a very, very delicate scale it s very hard to judge someone based on a one-hour interview, and it may seem like a very close call. But if you know a little bit about the candidate beforehand, it s like a big weight on one side of the scale, and the interview is useless. Once, right before an interview, a recruiter came into my office. You re going to love this guy, she said. Boy did this make me mad. What I should have said was,

Also note that the XAML fragments loaded using XamlReader.Load() are evaluated by the XAML parser for validity. Because they are not evaluated in the context of a containing XAML document, they need to be valid on their own. Consequently, if you are cutting and pasting from a containing document, be sure to add the necessary namespace declarations to the top-level element in the fragment to make it independently valid and thus avoid loading exceptions. Now, let s look at the second part of this sample. For the simulated commercials, you create a similarly structured data file named Commercials.xml. Listing 10-25 shows a sample. Listing 10-25. Commercials.xml Sample < xml version="1.0" encoding="utf-8" > <Commercials> <Marker Type="SLMovie"> <![CDATA[<Grid xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"> <MediaElement x:Name="medElem" Opacity="0.0" AutoPlay="true" Source="mms://localhost/SLBook/Ch010RichMedia/Media/sl.wmv" HorizontalAlignment="Left" VerticalAlignment="Top" /> <Border> <Border.Background> <VideoBrush Stretch="Fill" SourceName="medElem"/> </Border.Background> </Border>

When the user clicks the detail link, this page will be redirected to the catalog page for the selected pet ( catalog.zul where ItemID indicates that pet). The following snippet drives the details link; tb.setHref("catalog.zul#"+loc.getItemID()) establishes a hyperlink to catalog.zul# with the appropriate ItemID:

</Grid>]]> </Marker> </Commercials> Each commercial is tied to a marker type (derived from the TimelineMarkerType property discussed earlier) Within each <Marker> element, you again have an XAML snippet defining the commercial The previous sample includes another MediaElement in the snippet that points to a small Silverlight logo animation captured in a Windows media file The slwmv file used here is a part of the Expression Encoder installation and can be found in the StockContent folder under the Expression Encoder installation root But you can replace this with any wmv file or, for that matter, any other XAML snippet You also define another WCF service operation named GetCommercial() and apply another UriTemplate to use the Uri format <serviceaddress>/Commercial Marker={MarkerType} GetCommercial() accepts a marker type string and returns the XML for the matching <Marker> element Again, we encourage you to look at the sample code for the service operation details.

Refer back to Listing 10-23, and notice one more addition to the player XAML: another Grid named adContainer, this time contained in the Border serving as the main display You set adContainer at opacity 05 and align it with the lower-right corner of the containing Border Referring back to the code in Listing 10-24, notice that you attach handlers to the MediaOpened event for both the PIP and the main MediaElements in the Page_Loaded() handler In both those handlers, you invoke AttachClientMarkers() to attach a set of client-side markers to the media right after it opens Although you always display the commercial in the main display only, you attach the markers to both, because in previous recipes you enabled the user to switch media elements between displays using the PIP feature.

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