WP7 - web service calls return null instead of collections

I want to consume a webservice and particulary a method which return a collection. When i consume it by using a console application, it works. But when I try to consume it with a WP7 App, i only get a null object or empty list.

I have try to get a simple string and it works with both apps (console and WP7) so I think that I only get this issue with collections.

With Fiddler i monitor the traffic and i can see that the webservice return the right collections, with many items, but the return is still empty in my WP7 App.

Other details :

• I'm not the owner of the webservice

• I'm using the WP7emulator

• I meet the same issue but his solution doesn't help me: (WP7 consume a WCF Service)

Here is a code sample :

priv开发者_开发知识库ate void LoadData()
{
    client = new Service.WsivPortTypeClient();

    client.getLinesCompleted += new EventHandler<Service.getLinesCompletedEventArgs>(client_getLinesCompleted);
    client.getLinesAsync(null);
}

static void client_getLinesCompleted(object sender, Service.getLinesCompletedEventArgs e)
{
    //e.Results is always null or empty
}

And what do you have in e.Error ? Check if it's not null, you might get useful informations. Regards