[Mono-list] DataRelationCollection

[Alan Tam]

Thank you, Steinar. It is a good start for us to collect more information on
this "hidden" public class.

Regards,
Alan

----- Original Message -----
From: "Steinar Herland" <steinar.herland@gecko.no>
To: "Mono-List" <mono-list@ximian.com>; <Tam@SiuLung.com>
Sent: Thursday, February 06, 2003 1:33 AM
Subject: SV: [Mono-list] DataRelationCollection


Running this on MS.NET:
System.Data.DataSet ds = new System.Data.DataSet();
System.Data.DataRelationCollection drc = ds.Relations;
Console.WriteLine(drc.GetType().FullName);

Returns:
System.Data.DataRelationCollection+DataSetRelationCollection

Which means DataSetRelationCollection is a public class defined inside
DataRelationCollection

brgds, Steinar


-----Opprinnelig melding-----
Fra: Alan Tam [mailto:Tam@SiuLung.com]
Sendt: 5. februar 2003 16:50
Til: Mono-List
Emne: Re: [Mono-list] DataRelationCollection

> Its most likely a private or internal class of DataSet?
I have no idea as well. Just no idea why it has to be abstract. The few
methods
do not seem too special. But since I noticed something called
System.Data.DataTableRelationCollection, I suspect there is something
called
System.Data.DataSetRelationCollection (not even an inner class of
DataSet).
However, they (both DataTableRelationCollection and
DataSetRelationCollection)
are not observed anywhere in Microsoft's documentations.

> Anyways, someone started an implementation called
> DataTableRelationCollection to be internal.  It's at
> mcs/class/System.Data/System.Data/DataTableRelationCollection.cs
Yes, I was referring to it when I write this e-mail. It does not matter
at all
it is internal or not, but that since it is abstract it cannot be
instantiated.
This maybe the root of the problem that we never succeed in implementing
the
DataRelation class.

> It would be returned via the Relations property in a DataSet.
> If you look in DataSet.cs, you will see source code commented for it.
> It was never able to compile though.  So, maybe you could get it to
work?
:-)
Yes, I suppose DataSet would either create an instance in the
constructor, or
in property get of the Relations, a new instance of the
DataRelationCollection.
It seems to me that implementing DataRelation is not an easy task. It
involves
many missing code along many System.Data classes, including DataSet,
DataTable,
DataRow, etc.

Regards,
Alan

----- Original Message -----
From: "Daniel Morgan" <danmorg@sc.rr.com>
To: "Alan Tam" <Tam@siulung.com>; "Mono-List" <mono-list@ximian.com>
Sent: Wednesday, February 05, 2003 11:40 PM
Subject: RE: [Mono-list] DataRelationCollection


Its most likely a private or internal class of DataSet?

Anyways, someone started an implementation called
DataTableRelationCollection to be internal.  It's at
mcs/class/System.Data/System.Data/DataTableRelationCollection.cs

It would be returned via the Relations property in a DataSet.
If you look in DataSet.cs, you will see source code commented for it.
It was never able to compile though.  So, maybe you could get it to
work?  :-)

-----Original Message-----
From: mono-list-admin@lists.ximian.com
[mailto:mono-list-admin@lists.ximian.com]On Behalf Of Alan Tam
Sent: Wednesday, February 05, 2003 10:29 AM
To: Mono-List
Subject: [Mono-list] DataRelationCollection


Dear All,

This maybe a silly question. I noticed that
System.Data.DataRelationCollection
is abstract (with a few abstract members). Then where is the concrete
class
that it really stored? I've looked through the .NET Framework SDK
documentation
but still cannot find a known subclass for DataRelationCollection.
Anyone knows
what it is?

Regards,
Alan

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