Hi,

I attempted to perform an async call to a WCF service, using the same
technique for calling an async webservice method (Begin/End
AsyncPattern). This seems to be working ok.

BUT, it works only if I generate and use a proxy using WSDL. This
generates from the contract a single method which appears to the client
as if it is executing synchroniously on the server (which is great).

I prefer *not* to use the generated proxy (i.e. I use ChannelFactory<T>
and the CreateChannel() method), so I cannot use the AsyncPattern (on
the client side) because the interface of my server (which is available
to the client) has only a Begin/End OperationContract exposed.

For example:
Server's interface:

<code>
[ServiceContract]
public interface IServer
{
[OperationContract(AsyncPattern = true)]
IAsyncResult BeginDoSomething(int data, AsyncCallback callback,
object state);

// runtime throws error if the OperationContractAttribute is
placed here, unlike the earlier
// documentation - but it doesn't matter now...
void EndDoSomething(IAsyncResult result);
}
</code>

Client code:

<code>
ChannelFactory<IServer> factory = new ChannelFactory<IServer>(new
BasicHttpBinding(), new EndpointAddress(serverAddress));

IServer server = factory.CreateChannel();

// i want to be able to do this, just like when i use the proxy,
// but naturally i cannot because the IServer doesn't have this method.
server.DoSomething(2);
</code>

Using Reflector and reviewing the generated proxy, I saw that the proxy
inherits from a ClientBase<T>, and performs the call on a
base.InnerProxy, which eventually is created using CreateChannel() -
which seems to me pretty much what I am doing so far. What I'm missing
is how to perform the method call for DoSomething().



BTW: I don't mind a solution which uses "dirty" invocation (such as
reflection etc'). It just when I've iterated over the different methods
available from the remote object on the server, I've received the
Begin/End methods, but no sign of the DoSomething method.

Finally, please don't post answers such as "just use the proxy" etc'. I
know I can use the proxy, but I have my reasons and its quite
reasonable that its possible to invoke a remote async method not
necessarily using the proxy class generated by WSDL.

Thanks.

I got it working.

I figured that the difference between the generated proxy solution and
my solution was simply the Interface. The generated interface contained
a single DoSomething method whereas my original interface had the
Begin/End methods (as explained in my original post).

So I simply created a new IServer2 interface, which contains the single
DoSomething method, along with the Action property which identifies it
uniquely (otherwise there's a "contract mismatched" exception - the
specific type is ActionNotSupportedException).

This solved the problem, so my understanding is simply that we have to
dispatch a remote invocation of the single signatured method
(DoSomething), and that Indigo does the rest for us on the server side
(i.e. splits the calls to Begin/End). This sounds logical to me as the
client should not be aware of the server side implementation.

Just for the sake of it, I iterated over the Type once more (the
Transparent proxy), and this time I got the DoSomething method instead
of the two Begin/End methods. This is a bit weird, because it looks
like the reflection is affected by the interface and doesn't actually
reflect the object. I must be missing something here, but its a fact.

So my new client code looks something like this:
<code>
[ServiceContract]
public interface IServer2 // comes as an addition to IServer
{
[OperationContract(Action =
"http://tempuri.org/IServer/DoSomething")]
void DoSomething(int data);
}

ChannelFactory<IServer2> factory = new ChannelFactory<IServer2>(new
BasicHttpBinding(), new EndpointAddress(serverAddress));

IServer2 server = factory.CreateChannel();

// works !
server.DoSomething(2);
</code>

OTOH you do can use proxy but generate it with "svcutil /async ..." which
create async proxy so you can use async client in this case , using and use
async behavior of your server
Arkady

"ewolfman" <ewolfman@yahoo.com> wrote in message
news:1151959693.104920.110200@a14g2000cwb.googlegroups.com...
>I got it working.
>
> I figured that the difference between the generated proxy solution and
> my solution was simply the Interface. The generated interface contained
> a single DoSomething method whereas my original interface had the
> Begin/End methods (as explained in my original post).
>
> So I simply created a new IServer2 interface, which contains the single
> DoSomething method, along with the Action property which identifies it
> uniquely (otherwise there's a "contract mismatched" exception - the
> specific type is ActionNotSupportedException).
>
> This solved the problem, so my understanding is simply that we have to
> dispatch a remote invocation of the single signatured method
> (DoSomething), and that Indigo does the rest for us on the server side
> (i.e. splits the calls to Begin/End). This sounds logical to me as the
> client should not be aware of the server side implementation.
>
> Just for the sake of it, I iterated over the Type once more (the
> Transparent proxy), and this time I got the DoSomething method instead
> of the two Begin/End methods. This is a bit weird, because it looks
> like the reflection is affected by the interface and doesn't actually
> reflect the object. I must be missing something here, but its a fact.
>
> So my new client code looks something like this:
> <code>
> [ServiceContract]
> public interface IServer2 // comes as an addition to IServer
> {
> [OperationContract(Action =
> "http://tempuri.org/IServer/DoSomething")]
> void DoSomething(int data);
> }
>
> ChannelFactory<IServer2> factory = new ChannelFactory<IServer2>(new
> BasicHttpBinding(), new EndpointAddress(serverAddress));
>
> IServer2 server = factory.CreateChannel();
>
> // works !
> server.DoSomething(2);
> </code>
>

Obviously, you don't need proxy in WCF but you can read meta data
programmatically and behave in advance
Arkady


"Arkady Frenkel" <arkadyf@hotmailxdotx.com> wrote in message
news:%23cVGMDznGHA.956@TK2MSFTNGP03.phx.gbl...
> OTOH you do can use proxy but generate it with "svcutil /async ..." which
> create async proxy so you can use async client in this case , using and
> use async behavior of your server
> Arkady
>
> "ewolfman" <ewolfman@yahoo.com> wrote in message
> news:1151959693.104920.110200@a14g2000cwb.googlegroups.com...
>>I got it working.
>>
>> I figured that the difference between the generated proxy solution and
>> my solution was simply the Interface. The generated interface contained
>> a single DoSomething method whereas my original interface had the
>> Begin/End methods (as explained in my original post).
>>
>> So I simply created a new IServer2 interface, which contains the single
>> DoSomething method, along with the Action property which identifies it
>> uniquely (otherwise there's a "contract mismatched" exception - the
>> specific type is ActionNotSupportedException).
>>
>> This solved the problem, so my understanding is simply that we have to
>> dispatch a remote invocation of the single signatured method
>> (DoSomething), and that Indigo does the rest for us on the server side
>> (i.e. splits the calls to Begin/End). This sounds logical to me as the
>> client should not be aware of the server side implementation.
>>
>> Just for the sake of it, I iterated over the Type once more (the
>> Transparent proxy), and this time I got the DoSomething method instead
>> of the two Begin/End methods. This is a bit weird, because it looks
>> like the reflection is affected by the interface and doesn't actually
>> reflect the object. I must be missing something here, but its a fact.
>>
>> So my new client code looks something like this:
>> <code>
>> [ServiceContract]
>> public interface IServer2 // comes as an addition to IServer
>> {
>> [OperationContract(Action =
>> "http://tempuri.org/IServer/DoSomething")]
>> void DoSomething(int data);
>> }
>>
>> ChannelFactory<IServer2> factory = new ChannelFactory<IServer2>(new
>> BasicHttpBinding(), new EndpointAddress(serverAddress));
>>
>> IServer2 server = factory.CreateChannel();
>>
>> // works !
>> server.DoSomething(2);
>> </code>
>>
>
>