Comments on: Display Images with the Silverlight Downloader in Alpha 1.1

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By: Sander

Sander — Wed, 28 May 2008 11:45:16 +0000

I didn’t like the idea of opening up a proxy on my server, so I’ve worked around this. It turns out that after loading an image through HTML, it’s available like any local resource. This means you can dynamically add a new HTML tag, wait until it’s loaded, then use it in a Silverlight Image. Here’s what it looks like:

img = System.Windows.Browser.HtmlPage.Document.CreateElement(“img”);

System.Windows.Browser.HtmlPage.Document.Body.AppendChild(img);

img.AttachEvent(“onload”, ImageLoaded);
img.SetStyleAttribute(“visibility”, “hidden”); // hide the
img.SetAttribute(“height”, “0″); // required
img.SetAttribute(“width”, “0″); // required
img.SetAttribute(“id”, “tempdownloader”);
img.SetAttribute(“src”, “http://hirise-pds.lpl.arizona.edu/PDS/EXTRAS/RDR/TRA/ORB_000800_000899/TRA_000873_1780/TRA_000873_1780_RED.NOMAP.browse.jpg”);

… and the callback:

private void ImageLoaded(object source, System.Windows.Browser.HtmlEventArgs e)
{
MyImage.SetValue(Image.SourceProperty, (source as HtmlElement).GetAttribute(“src”));
}

By: Natasha

Natasha — Sun, 11 May 2008 19:29:03 +0000

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By: Marc Roussel

Marc Roussel — Sun, 17 Feb 2008 13:04:37 +0000

Hi,

I have multiple images on my page. I’ using the downloader in C# so I can download IMAGE per IMAGE. That means, I’m trying to download an image and add it to another xaml (Object instantiated that containt an Image object)

The problem is that when I issue the Send() for each image, I just get the last one because it gets in the Completed event only at the last image. I don’t understand this behavior.

Anybody can help on this ?

See this thread for more info :
http://silverlight.net/forums/t/9916.aspx

Thank you

By: Peter Kellner

Peter Kellner — Mon, 31 Dec 2007 15:25:20 +0000

Hi Andrew,

I wish I knew javascript better. I struggled for a long time trying to figure out how to get the data passed and my encoding mechanism does not feel like a good solution, but it does work and it was the best I could come up with. If you write up a better way, I’ll be happy to blog about and point to your solution.

By: Andrew Arnott

Andrew Arnott — Mon, 31 Dec 2007 04:37:30 +0000

Apologies… it looks like ASP.NET (arguably incorrectly) decodes the amperstand before splitting the variables, so the URL’s variables are split up instead of remaining with the single var.

By: Andrew Arnott

Andrew Arnott — Mon, 31 Dec 2007 04:33:07 +0000

Why are you inventing your own encoding mechanism? You can use Javascript’s escape() function on the client, and then ASP.NET will automatically decode it (internally using HttpUtility.UrlDecode) for you just by calling Request.QueryString["somevar"].
In fact, the encoding done by the escape function is the “right” way to do it according to the URL spec.

By: Justin-Josef Angel [MVP]

Justin-Josef Angel [MVP] — Mon, 16 Jul 2007 10:31:15 +0000

That’s a great solution, good job.

In your opinion should we compensate for the lack of Classes/framework/”Options” in the silverlight CLR by transfering work the server which has an fully-blown .Net CLR & Framework?
Do you consider this a viable solution?