Question

I’ve to download an image from the server on button click.
The code is:

private void Button_Click(object sender, RoutedEventArgs e)
    {
        (sender as Button).IsEnabled = false;
        progressbar.IsIndeterminate = true;
        WebClient w = new WebClient();
        w.OpenReadAsync(new Uri("http://example.com/xxx/image.png"));
        w.OpenReadCompleted += new OpenReadCompletedEventHandler(w_OpenReadCompleted);
    }

    void w_OpenReadCompleted(object sender, OpenReadCompletedEventArgs e)
    {
        progressbar.IsIndeterminate = false;
        BitmapImage b = new BitmapImage();
        b.SetSource(e.Result);
        Image img = new Image();
        img.Source = b;
        LayoutRoot.Children.Add(img);
    }

The problem which I’m facing is that for the first time the data is being downloaded from the server and shown correctly. However, if I quit the application and again start it, it downloads the old image even if I have deleted the image from the server or changed the image. I think the image is getting cached somewhere but don’t know how to solve this problem.

Answer 1

I think this will be the same as your issue:

How do you disable caching with WebClient and Windows Phone 7

I haven’t noticed this behaviour when using the HttpWebRequest to get data. But I’am not sure about it.

Update: HttpWebRequest has by default the same behaviour but can be disabled. This blogpost is talking about the options you have:
http://www.nickharris.net/2010/10/windows-phone-7-httpwebrequest-returns-same-response-from-cache/