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The ability to feed each page separately to account for large documents and to prevent having to download the whole document to the client PC before viewing it.

The basic requirements for building a document viewer using Silverlight would be:

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To extract an image from a PDF and set it as the source for a Silverlight image object would require extracting the image into a temporary file on the server and setting the source of the image as the temporary URL: a solution that is not feasible in any real-life situation. The only way to specify the source for an image is by using a URL.

The image object provided by Silverlight is limited in that it does not allow for inline image data.

To access the ImageSource, the right syntax is the ImageBrush element should be skipped altogether, which did not make sense to me. To access the Opacity, one can simply use elem.Opacity.

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With complex objects such as the Path object, it is difficult to figure out how to access a specific attribute.

Accessing the left position using elem.Left returns an error and should be replaced with elem.GetValue(“Canvas.Left”).

Accessing the width of a canvas object is done using elem.Width, assuming that elem is an object of type Canvas.

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Inconsistencies in the Silverlight object model made trial and error the most time-consuming part of building the sample.

This precludes the ability to dynamically stream a document from a server to a client, which is a basic requirement of most applications. Silverlight provides no neat way of packaging a document the same way that PDF and XPS do, but requires all the bits and pieces of a document to be created separately on the server and downloaded programmatically using the calling application. There is no mechanism by which one can feed multiple pages separately, nor is there a way to feed all the resources such as images and fonts used by that page.

Silverlight supports reading only a single XAML file.

I was, however, faced with a number of challenges: Converting a PDF, or any document for that matter, into an XPS can easily be achieved with the Amyuni PDF Creator all that was needed is a way to feed the XPS into the Silverlight control. It would be sufficient to convert the PDF document into an XPS, which is a derivative of XAML, feed the XPS to the Silverlight control, add some bells and whistles and be done. No additional components need to be downloaded or run on the client PC.Īt first glance, viewing PDF documents within a Silverlight control looked like a 15-minute job. Requirements (Client Side)Īny web browser running on any operating system with the Silverlight control version 1.0 or higher. The sample that is given is based on ASP, but any programming environment that supports either ActiveX or. The sample can also be run directly from the same location. The Amyuni PDF Creator and Converter versions 4.0 components are needed to run the sample and can be found here. The framework that is presented can be easily expanded to add inter-activity when the PDF files contain interactive form fields.

The documents are located on the server and viewed by the client within a Silverlight control without having to download any files or components to the client. I will adapt the page turn framework to viewing PDF, XPS or any type of document rather than JPEG images. In this article, I will show how to use the Amyuni PDF components to dynamically view PDF documents within a Silverlight control. Now that PDF has become the standard format for document storage and forms processing in most corporations, I thought that Silverlight applications would benefit from the ability to natively serve PDF documents and forms. A more natural choice for me would be to use high-quality PDF documents that would have been easily readable by the users. It struck me that the author had converted his sample documents into poor quality JPEG images in order to demonstrate the "Page-Turn" Silverlight application. While reading some MSDN articles about the power of Silverlight and the types of applications that can be built with it, I came across Jeff Prosise’s article in the May 2008 MSDN issue. Using Microsoft Silverlight, developers can provide their users with content-rich web applications that are not limited to text and images, and which can now include complex graphics and better interaction with the users. Read the latest advertorial from Amyuni here

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