Image.Source using proxy

Question

On my WPF page I have, for example, an image (one or more) like this:

<Image Source="{Binding Path=PicURL}"/>

Also, I have a Settings page with an option to switch ON/OFF the usage of Internet Proxy Settings globally inside my entire Application. If to speak about manual web requests, I can solve it, for example, like this:

HttpWebRequest request = ( HttpWebRequest )WebRequest.Create( ... );
if( UseProxy ) request.Proxy.Credentials = CredentialCache.DefaultCredentials; 
               else req.Proxy = null;

But it doesn`t work on WPF controls like Image where content is based on URLs and Internet Proxy Settings are used.

Is there a way to switch proxy globally inside entire app at run-time?

Answer 1

You might be able to modify WebRequest.DefaultWebProxy

• How should I set the default proxy to use default credentials?

• system.net default proxy c# .Net 4

If those dont work in your situation then a workaround is you can download the "resource" from the Web yourself using WebRequest with/or without the Proxy settings.

You can use that data returned by the web request as a stream to initialise a BitmapImage which you can then set into the Source, or you could save to a temporary file and make the Source point to that local file.

• WPF Image UriSource and Data Binding using http:\\ URL

You would write and use a "Converter" on your Binding which does the downloading/conversion from image Url to BitmapImage, or maybe a MarkupExtension might be possible depending on your situation.

You'd probably want to use Aynchronous bindings, because the download of the image resource might take a while, and you don't want that to block your main UI thread.

• Loading image in thread with WPF

Answer 2

Try this one if you want the proxy settings to be config file

<?xml version="1.0" encoding="utf-8" ?>
     <configuration>
          <system.net>
              <defaultProxy enabled="true" useDefaultCredentials="true">
                <proxy proxyaddress="http://proxyaddress:port" 
                       usesystemdefault="False" 
                       bypassonlocal="True" 
                       autoDetect="False" />
              </defaultProxy>
          </system.net>
</configuration>

Cheers