"cannot serialize interface" error in web service, help please

[n_o_s_p_a__m]

My web service has a webmethod whose return type is declared as an
interface type, for example:

[WebMethod()]
public IBusinessProces s GetBusinessProc ess() {}

which generates the lovely error:

Cannot serialize interface IBusinessProces s

The returned object (which implements IBusinessProces s), however, is
marked Serializable; but I gather that doesn't matter and that this is
some limitation in web services (because of marshalling)?

Please let me know what's up here. Thanks in advance.

-NS

[Robert Jeppesen]

Re: "cannot serialize interface" error in web service, help please

Hi,

I don't think that you can serialize an interface. Here are some ideas for solving it:
1. Replace the interface with a base class. Obviously, this won't work if you need to inherit from other classes.
2. I have no idea if this will work, but:
Have the webmethod return an object (that implements your interface).
Make sure that the client app has a reference to the same interface. You probably need to have the interface in a separate dll that
both client and server has access to.
In the client, just cast the returned object to your interface.

--
Robert Jeppesen
robert.jeppesen %at%durius-dot-se


"n_o_s_p_a_ _m" <n_o_s_p_a__m@m ail.com> wrote in message news:1faa8782.0 310080835.4713b 002@posting.goo gle.com...[color=blue]
> My web service has a webmethod whose return type is declared as an
> interface type, for example:
>
> [WebMethod()]
> public IBusinessProces s GetBusinessProc ess() {}
>
> which generates the lovely error:
>
> Cannot serialize interface IBusinessProces s
>
> The returned object (which implements IBusinessProces s), however, is
> marked Serializable; but I gather that doesn't matter and that this is
> some limitation in web services (because of marshalling)?
>
> Please let me know what's up here. Thanks in advance.
>
> -NS[/color]