How to build a WCF service from an existing WSDL

[Hao]

I have an existing ASMX web service produced WSDL. I am trying to upgrade
the ASMX to WCF. The client side applications are already deployed on
customers sites. We are definitely not able to change the WSDL in any way.
Therefore I am thinking maybe the right approprach is to start a WCF service
from an existing WSDL.
What are the steps then?
I know how to create a WCF from an interface, which is the normal way, but I
cannot make the service talking to the clients, because the generated WSDL
from WCF are very different from the original WSDL that I published to
client application before.
Thanks.
Hao

[Spam Catcher]

Re: How to build a WCF service from an existing WSDL

"Hao" <Hao@newsgroup. nospamwrote in
news:#s2yN5S#HH A.748@TK2MSFTNG P04.phx.gbl:

I have an existing ASMX web service produced WSDL. I am trying to
upgrade the ASMX to WCF. The client side applications are already
deployed on customers sites. We are definitely not able to change the
WSDL in any way. Therefore I am thinking maybe the right approprach is
to start a WCF service from an existing WSDL.
What are the steps then?

I would stick with ASMX.

[Hao]

Re: How to build a WCF service from an existing WSDL

Unfortunately, that is not an option (at least not my favorite one). There
are too many performance hit by using the ASMX, since IIS is involved. We
are developing a data center application and require processing large amout
of data via web services. If we cannot use WCF, we will have to dump .Net
and switch to C++ (too bad).

Thanks.
Hao

"Spam Catcher" <spamhoneypot@r ogers.comwrote in message
news:Xns99AE863 2148C6usenethon eypotrogers@127 .0.0.1...

"Hao" <Hao@newsgroup. nospamwrote in
news:#s2yN5S#HH A.748@TK2MSFTNG P04.phx.gbl:
>

>I have an existing ASMX web service produced WSDL. I am trying to
>upgrade the ASMX to WCF. The client side applications are already
>deployed on customers sites. We are definitely not able to change the
>WSDL in any way. Therefore I am thinking maybe the right approprach is
>to start a WCF service from an existing WSDL.
>What are the steps then?

>
I would stick with ASMX.

[Spam Catcher]

Re: How to build a WCF service from an existing WSDL

"Hao" <Hao@newsgroup. nospamwrote in
news:#MFqUJW#HH A.2752@TK2MSFTN GP06.phx.gbl:

Unfortunately, that is not an option (at least not my favorite one).
There are too many performance hit by using the ASMX, since IIS is
involved.

What sort of performance hit are you experiencing? Are you doing all the
processing on the web server? Also web services are inherently slower
due to the the need to serialize, transmit, receive, deserialize.

You may want to adopt a tiered approach in which you process the data
with a back end service. The web service is merely the front-end to the
service.

Or are you having trouble transmitting large amounts of data? In that
case you should be looking into MTOM - it's part of Microsoft's WSE
pack.

We are developing a data center application and require
processing large amout of data via web services. If we cannot use WCF,
we will have to dump .Net and switch to C++ (too bad).

How will WCF help you? Microsoft recommends hosting WCF in IIS if you
want redundancy and load balacing.

ServiceHost (self-hosting) WCF is not recommended for high volume.
ServiceHost is only good if you need to maintain state or want the
application to be standalone.

Here is a good article describing WCF's hosting options:

http://msdn2.microsoft.com/en-us/library/bb332338.aspx

BTW, if you can host in IIS 7.0, you can host non-HTTP transports as
well.

But in in general, I think you have an issue with your architecture...
not necessarily the technology?