RE: Type fidelity - reusing mechanism used by framework to serialize Datasets ??

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From: Dan Rogers (danro_at_microsoft.com)
Date: 11/24/04 

Date: Wed, 24 Nov 2004 17:44:35 GMT

Hi Matt,

The best advice I can offer here is to use datasets inside of your own
applicaiton domains, but not across your web service boundaries. This is
advice centered in maximizing cross-platform, cross tool-version interop
based on well defined data contracts.

As for specific questions about how to decode a dataset, my advice is to
use a dataset to decode a dataset. The WSDL for a contract that involves a
dataset describes an "any" (e.g. an untyped object) - making this a loosely
coupled interface that is not suitable for tool-supported cross platform
interop.

You may wish to consider the WS-I.org basic profile 1.0 guidelines, which
steer you away from using framework specific "smart types" such as the .NET
dataSet, the java Hash table, etc. These require specific implementations
to work with, and thus impede the goals that one would use a web service
interface to solve.

I hope this helps

Dan Rogers
Microsoft Corporation
--------------------
>From: matt_randle@yahoo.com (Matt)
>Newsgroups: microsoft.public.dotnet.framework.aspnet.webservices
>Subject: Type fidelity - reusing mechanism used by framework to serialize
Datasets ??
>Date: 24 Nov 2004 04:20:10 -0800
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>
>Hi,
>
>Can anyone please tell me if you can use the same method that
>Microsoft uses to ensure the client/server type fidelity of 'Dataset'
>for custom types ?
>
>i.e. Wsdl.exe somehow knows not to generate a proxy class for the
>Dataset type. Can you use attributes or interfaces on your own
>serialized types that force the same behavior ??
>
>I know that you can edit the wsdl generated proxy to achieve the same
>effect. I also know that using Datasets is not a good thing to do
>from an interoperability view point.
>
>I cannot find any explanation of how this is done. There are plenty
>of explanations of XML serialization over Web Services but the
>mechanism used to ensure type fidelity of Datasets is glossed over.
>
>Surely there is not code hardwired into wsdl.exe and the Remoting
>Framework to specifically handle Datasets?? This would seem to be
>inconsistent with the design of the rest of .net that allows
>extensibility/reuse wherever possible ??
>
>Thanks in advance,
>
>Matt.
>

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