Comments on: WCF – IIS Hosted Duplex Service & Winforms

By: savij

savij — Wed, 09 Dec 2009 22:12:13 +0000

I think he meant on the form, just make sure it implements the callback interface or the service wont be able to see the form. Also, if you are using VS 2008 you can just create a WCF class and host it in a web project. It’s way easier now than when this article was written. Still, it’s nice to understand how it all works and how to manually do it.

I also updated the article to use IsOneWay on the OperationContract attribute. This is needed for the callback to work now.
-Jeff

By: YoG

YoG — Wed, 09 Dec 2009 21:41:13 +0000

I’m getting the same exception as fhirzall, but I don’t get the resolution… what does it means “implement my interface on the form”?

By: savij

savij — Fri, 12 Jun 2009 22:10:12 +0000

Really not sure on this one. I have not messed with WPF to be an authority on it. I will leave your post up here and perhaps others can help shed some insight.

By: Hetal

Hetal — Thu, 11 Jun 2009 16:01:25 +0000

Is that possible to use Duplex Service with XBAP (WPF browser app)?
I am getting error for security. when I set up full trust and add temp certificate on IE. it works fine.

By: savij

savij — Thu, 20 Nov 2008 13:41:13 +0000

Pavan,

How the hell do you expect me to reply to that one? You give no details, no exceptions and no insight. I really get annoyed with postings like this on forums and blogs. We are here to help, but come on!

-J

By: Pavan Kumar G

Pavan Kumar G — Thu, 20 Nov 2008 11:16:47 +0000

Hi,

I am uanble to recieve a callback from server.I am getting timeout exception.

Thanks
Pavan

By: savij

savij — Wed, 22 Oct 2008 02:32:55 +0000

Sorry I didnt get back to you. I was on vacation in Orlando and didnt get a chance to see the post. Glad you got it figured out!!!

-J

By: fhirzall

fhirzall — Sat, 18 Oct 2008 17:40:55 +0000

I figured it out. I forgot to implement my interface on the form!

Thanks!

By: fhirzall

fhirzall — Thu, 16 Oct 2008 03:27:36 +0000

Great article, one of the simpler ones on WCF for starters. I’m getting this exception on button click when I try to register a client, any ideas? I’m using .net 3.5 if anything changed there. Thank you.

An unhandled exception of type ‘System.InvalidOperationException’ occurred in System.ServiceModel.dll

Additional information: The InstanceContext provided to the ChannelFactory contains a UserObject that does not implement the CallbackContractType ‘WCFClient.ServiceReference1.IHelloWorldServiceCallback’.

By: savij

savij — Tue, 18 Mar 2008 12:54:35 +0000

That depends on what type of security you are trying to provide. You can use HTTPS to encrypt the stream, but I don’t really have enough information to know if that covers the bases enough for your needs. There are many resources available to you on this subject.

I would start with these two links:
http://msdn2.microsoft.com/en-us/library/ms735093.aspx
http://msdn2.microsoft.com/en-us/library/ms731925.aspx

Hope that helps!

-Jeff