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Asked: 2026-05-13T22:58:36+00:00

I’m retreiving images from a web server directory like this: WebClient webClientImgDownloader = new

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I’m retreiving images from a web server directory like this:

        WebClient webClientImgDownloader = new WebClient();
        webClientImgDownloader.OpenReadCompleted += new OpenReadCompletedEventHandler(webClientImgDownloader_OpenReadCompleted);
        if(uriIndex < uris.Count())
            webClientImgDownloader.OpenReadAsync(new Uri(uris[uriIndex], UriKind.Absolute));

But I’ve noticed if I remove the image, silverlight continues to retrieve the image as if it were there.

When I then type the image URL into FireFox I see the image as well, but then I click Reload and it gives me the appropriate error that the image doesn’t exist. Then when I run my silverlight application again, it also appropriately gives me an error that the image doesn’t exist as if the browser had cleared a cache flag somewhere.

How can I then do a “refresh” via WebClient in code, so that if an image suddenly doesn’t exist on the server, Silverlight doesn’t continue to give me a cached copy of it?

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1 Answer

  1. Editorial Team

    This is a tricky one as the caching is usually being caused by the website’s headers not specifying a no-cache. I’ve found that in the past the easiest way to deal with these caching issues is simply to provide a randomised query string parameters so that the web server interprets each request as a fresh request.

    if you’re currently requesting http://www.domain.com/image.jpg then try http://www.domain.com/image.jpg?rand=XXXX where XXXX is a random value generated in your server side code.

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