SetSource Method

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Sets the source value of an object with downloaded content.

Parameters

Return Value

None

Remarks

The SetSource method can be used as a way of setting downloaded media content to the Source property of the Image and MediaElement objects, or the ImageSource property of the ImageBrush object. The first parameter, downloader, identifies the Downloader object representing the downloaded content. The second parameter, part, identifies the specific part to retrieve within the downloaded content. If the downloaded content does not represent packaged content, such as a Zip file, part must be set to an empty string. The following JavaScript example shows how to use the SetSource method to set the Source property of an Image object to the downloaded content:

// Event handler for the Completed event.
function onCompleted(sender, eventArgs)
{
    // Retrieve the Image object.
    var myImage = sender.findName("myImage");
    // Set the Source property to the contents of the downloaded object,
    // In this case, since the downloaded content represents a single image file, promo.png,
    // the part parameter is set to an empty string.
    myImage.setSource(sender, "");
}

Silverlight provides the ability to download content as a package, which is a collection of independent files containing XAML content, media assets, and other application data. The Zip file format is supported as a download package. The following diagram illustrates a collection of application content contained within a Zip download package:

Once the package is successfully downloaded, you can use methods, such as GetResponseText, SetSource, and CreateFromXamlDownloader, to selectively retrieve a specific named part of the package. In this case, a part reference is the filename reference of the individual content within the package, such as "rotation01_green.png".

You can use the SetSource method to retrieve a specific part within the downloaded content package. When the downloaded content package is a Zip file, the SetSource method allows you to retrieve the contents of a filename within the Zip file. The following JavaScript example shows how to use the SetSource method to set the Source property of an Image object to a specified part within the downloaded content:

function onDownloadCompleted(sender, eventArgs)
{
    // Determine whether the download was successful.
    if (currentDownloadProgress != 1)
    {
    	alert("Failed to succesfully download zip file");
        return;
    }
    // Retrieve the XAML content from the downloaded package file.
    var jacketBrowserXaml = sender.getResponseText("jacketBrowser.xaml");
    // Create the objects from the XAML content.
    var jacketBrowser = control.content.createFromXaml(jacketBrowserXaml);
    // Add downloaded XAML content to the control.
    sender.findName("root").children.insert(0, jacketBrowser);
    // Retrieve a reference to the Image object representing the jacket.
    var jacketImageSlice = sender.findName("jacketSlice");
    // Set the Source property of the Image object to the specific jacket image
    // within the downloaded Zip package file.
    jacketImageSlice.setSource(sender, "rotation01_green.png");
}

Applies To

Image, ImageBrush, MediaElement

See Also

Downloader, Using a Downloader Object