WP7绑定图像控件到需要cookie的图像URI

Question

I am developing an app that consumes RESTful web services that needs login. This login is verified with session cookies and to download any data with a WebClient , I have used the following extension:

public class CookieWebClient : WebClient
{
    [SecuritySafeCritical]
    public CookieWebClient() : base()
    {
    }

    protected override WebRequest GetWebRequest(Uri address)
    {
        var request = base.GetWebRequest(address);
        if (request is HttpWebRequest)
        {
            (request as HttpWebRequest).CookieContainer = App.GlobalCookieContainer;
        }
        return request;
    }
}

However, some of the data returned is URIs for image thumbnails that are shown in different ListBoxes . Before I had to use login for the web services, I simply just bound the ImageSource to the specified URI in the data:

<Image Source="{Binding Icon_Url}" />

However, now that I have to use login, I have to provide a cookie when fetching the image. I thus thought that an IValueConverter would do the trick, where I would pass in the URI, which would then download the BitmapImage with my extended WebClient , right until I remebered that I can only do asynchronous calls with WebClient on WP7.

So my question is

How do I download images for a Image controls in a LisBoxItem that has to have a cookie in the request?

Thank you!

Answer 1

You can download the image with the http classes and set the image manually:

var stream = httpResponse.GetResponseStream(); 
var bitmap = new BitmapImage();
bitmap.SetSource(stream);
image.Source = bitmap;

But this will not work with simple XAML bindings... (but you can wrap this logic in an attached property)