The docs for System.Type claims that you cannot subclass from it in Silverlight. Is this being relaxed in v5?
Keith Rome Senior Consultant and Architect MCPD-EAD, MCSD, MCDBA, MCTS-WPF, MCTS-TFS, MCTS-WSS Wintellect | 770.617.4016 | kr...@wintellect.com www.wintellect.com On Apr 14, 2011, at 6:49 PM, "Tomas Matousek" <tomas.matou...@microsoft.com> wrote: > Couldn't you just subclass Type? It's methods are virtual and can be > overridden. I don't think you need to emit a real RuntimeType. > > Tomas > > -----Original Message----- > From: users-boun...@lists.ironpython.com > [mailto:users-boun...@lists.ironpython.com] On Behalf Of Keith Rome > Sent: Thursday, April 14, 2011 3:30 PM > To: Discussion of IronPython > Subject: Re: [IronPython] IronPython for Silverlight 5? > > After looking into what it takes to implement ICustomTypeProvider it seems > like it would be a nightmare for dynamic object support. You have to produce > actual custom Type instances, presumably using TypeBuilder and emitting IL > opcodes to handle the getter/setter accessors. If the databinding system > caches those dynamically-created Types then it could cause problems because > what happens when we add a new member via expando after binding once (or > remove one that previously existed)? But if they don't cache the Type objects > then it seems like the overhead might be absurd from constructing these > things again and again (and you can't use TypeBuilder without first creating > a dynamic assembly and module). > > I really hope they alter course and go with ICustomTypeDescriptor instead (or > even IDynamicMetaObjectProvider if that is feasible). I really don't > understand how they expect the current system to work for "dynamic > properties" because there is nothing dynamic at all about a System.Type > instance. The best it can hope to be is a snapshot of the metadata from a > dynamic object as of some point in time. > > > Keith Rome > Senior Consultant and Architect > MCPD-EAD, MCSD, MCDBA, MCTS-WPF, MCTS-TFS, MCTS-WSS Wintellect | 770.617.4016 > | kr...@wintellect.com www.wintellect.com > > > -----Original Message----- > From: users-boun...@lists.ironpython.com > [mailto:users-boun...@lists.ironpython.com] On Behalf Of Jeff Hardy > Sent: Thursday, April 14, 2011 4:11 PM > To: Discussion of IronPython > Cc: Chad Brockman > Subject: Re: [IronPython] IronPython for Silverlight 5? > > On Thu, Apr 14, 2011 at 11:03 AM, Dino Viehland <di...@microsoft.com> wrote: >> Jeff wrote: >>> On Wed, Apr 13, 2011 at 11:14 PM, Chad Brockman <cha...@slb.com> >>> wrote: >>>> I see Silverlight 5 now has something besides simple reflection >>>> (ICustomTypeProvider) - >>>> >>>> http://msdn.microsoft.com/en-us/library/gg986857(v=VS.96).aspx#data >>>> >>>> Will we see an update to Iron*/DLR to support binding to dynamic >>>> objects any time soon? This will open fantastic options for using >>>> IronPython in Silverlight. >>> >>> If someone provides a patch, yes. >>> >>> We actually need someone with an interest in Silverlight to keep an >>> eye on it and make sure that we don't break SL support and new >>> features like this. We don't have anyone in that role right now. >> >> If anyone's interested on working on this it'd probably mean adding an >> implementation of this onto OldInstance as well as adding it onto our >> new-style instances whose classes are created by NewTypeMaker. Adding >> the interface is probably pretty easy, making it return useful things may be >> a little more difficult. >> >> I'm a little surprised they didn't go with the already existing >> ICustomTypeDescriptor. > > Are you really surprised? :) > > It is still in Beta. Maybe there's a slight chance their minds could be > changed? I'm guessing they don't have the rest of System.ComponentModel > either, so they didn't want to add just one interface. > > - Jeff > _______________________________________________ > Users mailing list > Users@lists.ironpython.com > http://lists.ironpython.com/listinfo.cgi/users-ironpython.com > > > _______________________________________________ > Users mailing list > Users@lists.ironpython.com > http://lists.ironpython.com/listinfo.cgi/users-ironpython.com > > > > > _______________________________________________ > Users mailing list > Users@lists.ironpython.com > http://lists.ironpython.com/listinfo.cgi/users-ironpython.com > _______________________________________________ Users mailing list Users@lists.ironpython.com http://lists.ironpython.com/listinfo.cgi/users-ironpython.com
