Part III in .NET

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Part III
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Programming Silverlight Applications
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The content that can be downloaded can be XAML, text, or media and can be downloaded as a single file or as a package that is zipped together as a ZIP file. The following sections discuss using the Downloader object to download and render content dynamically.
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Understanding the Downloader object
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The Downloader object provides functionality to initiate data transfer, monitor the progress of the download, and retrieve the downloaded contents. Downloader objects can be created by using the createObject() function of the Silverlight application and passing the string downloader, as shown in the following code:
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function makeDownloader(sender, eventArgs) { var plugin = sender.getHost(); var dLoader = plugin.createObject( downloader ); }
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The Downloader object exposes several additional methods, properties, and events that provide a means to initiate the download, monitor the progress, and access the content that is downloaded. Table 9.5 lists the Downloader-specific properties that are exposed by a Downloader object.
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TABLE 9.5
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Downloader-Speci c Properties That Are Exposed through a Downloader Object
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Property Description
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DownloadProgress
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Double between 0 and 1. Represents the amount of the total content that has been downloaded. You can determine the percentage of the total content that has been downloaded by multiplying this value by 100. String. Specifies the name of the XAML object. This value is read-only in JavaScript and write-only in XAML. String. Represents a string version of the downloaded content. This property is only valid inside the Completed event handler. This value is only used if you are downloading a single file; if you are downloading a ZIP package, then use the GetResponseText() method. Integer. Specifies the current state of the Downloader request. This value defaults to 0. A value of 200 designates OK meaning the request was successful. A value of 204 designates no content meaning that the server could not find the content specified in the request. String. A string representation of the value of the Status property. String. Specifies a string corresponding to the URI of the Downloader object request.
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Name ResponseText
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Status
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StatusText Uri
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Table 9.6 lists the Downloader-specific methods that are exposed by a Downloader object.
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TABLE 9.6
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Downloader-Speci c Methods That Are Exposed through a Downloader Object
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Attribute Description
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Abort()
Cancels the current Downloader request and resets the DownloadProgress, Status, and StatusText properties to their initial state. Accepts two arguments. The first argument specifies a string representation of the downloader event. The second argument specifies an event handler function that handles the event. This method attaches the event handler to the Downloader object. Accepts an object as the only argument and compares it to the Downloader object. True is returned if the objects match; otherwise, false is returned. Accepts a string specifying an object name as the only argument and returns the object if it can be found referencing the object s x:Name attribute. If the object is not found, null is returned. Returns a reference to the Silverlight plug-in instance that contains the Downloader object. Accepts a string specifying a package part name as the only argument and returns a string representation of the part if it is found. For example, if you are downloading a ZIP package containing a text file named config.txt, the following call to GetResponseText() would retrieve the content: myDownloader.GetResponseText( config.txt ); Accepts a string representing a Silverlight property name as the only argument and returns the value of the Silverlight property. Most properties can be accessed using standard dot syntax; however, this can be useful if you need to access properties such as Canvas.Top. Accepts two arguments. The first argument is a string representing the verb used in the Downloader (currently only GET is supported). The second argument specifies the URI of the content file or package to download. The Open() function initializes the Downloader object; however, the request is not sent until the Send() method is called. Note: Backslashes are not permitted in the URI; use forward slashes. Also, cross domain addresses are not permitted. Executes the Downloader request specified in the Open() function asynchronously. Accepts a string representing a Silverlight property name as the first argument and a value as the second argument. SetValue() sets the value of the Silverlight property to the value argument. Most properties can be accessed using standard dot syntax; however, this can be useful if you need to access properties such Canvas.Top.
AddEventListener (event, handler)
Equals(object) FindName(name)
GetHost() GetResponseText(part)
GetValue (property)
Open(verb, uri)
Send() SetValue (property, value)