Vista - Async WCF and InvokeRequired

All,

I have a smart client that talks to an WCF service, all my calls are ASYNC,
I have noticed that InvokeRequired never gets sent to true.

When I look at the threads in the debugger, I can see that the async call
backs use the same thread as the form, is this always going to be the case?

Steve

Steve,

Can you be a bit more specific on the scenario?

Thanks,

Juval Lowy.


"Steve Drake" <Steve@_NOSPAM_Drakey.co.uk> wrote in message
news:eca1R9TFGHA.1676@TK2MSFTNGP09.phx.gbl...
> All,
>
> I have a smart client that talks to an WCF service, all my calls are
> ASYNC, I have noticed that InvokeRequired never gets sent to true.
>
> When I look at the threads in the debugger, I can see that the async call
> backs use the same thread as the form, is this always going to be the
> case?
>
> Steve
>

I assume you are using a proxy with



[OperationContract(AsyncPattern = true,.]



Yes, this is by design.

If Begin<operation name> is dispatched by a UI thread (actually, any thread
that has Windows Forms context), the callback will automatically be
marshaled to UI thread so that you could access windows and controls
directly.



A similar feature is available with ASMX proxies in .NET 2.0 without WCF, as
well as PictureBox.LoadAsync(), SoundPlayer, Ping.Send(), etc.



Hope that helps,



Juval Lowy.



"Steve Drake" <Steve@_NOSPAM_Drakey.co.uk> wrote in message
news:eggCA7fFGHA.648@TK2MSFTNGP14.phx.gbl...
> This is not an issue eg is not causing me a problem.
>
> I have a windows form application, I run a remote method asynchronously,
> eg
>
> thing.BeginGetNodes(treeParent, new AsyncCallback(endAddNodes), new
> statething(tn, treeParent));
>
> In my endAddNodes I would expect me to need to todo code like :
>
> if (InvokeRequired)
> {
> // Never gets called
> this.BeginInvoke(new AsyncCallback(endAddNodes), new object[] { ar });
> }
>
> but, as InvokeRequired never gets set to true, i dont need this code, i
> have check the Thread number in Debug, and the endAddNodes is getting
> called by the correct thread, eg is the thread that is used to create the
> form.
>
> So, my question is, is this by design and is it going to remain.
>
> Steve
>
>
>
>
>
> "Juval Lowy" <juval.lowy_remove_this@idesign.net> wrote in message
> news:OP3qTOXFGHA.524@TK2MSFTNGP09.phx.gbl...
>> Steve,
>>
>> Can you be a bit more specific on the scenario?
>>
>> Thanks,
>>
>> Juval Lowy.
>>
>>
>> "Steve Drake" <Steve@_NOSPAM_Drakey.co.uk> wrote in message
>> news:eca1R9TFGHA.1676@TK2MSFTNGP09.phx.gbl...
>>> All,
>>>
>>> I have a smart client that talks to an WCF service, all my calls are
>>> ASYNC, I have noticed that InvokeRequired never gets sent to true.
>>>
>>> When I look at the threads in the debugger, I can see that the async
>>> call backs use the same thread as the form, is this always going to be
>>> the case?
>>>
>>> Steve
>>>
>>
>>
>
>