Is it possible to access a Silverlight control via the COM automation model?

What I'm trying to attempt is to access methods on a Silverlight control via the COM automation model. Theoretically it should be possible, as exposing the Silverlight control's methods as scriptable members exposes them through an IDispatch interface. I have been able to access the IDispatch interface through the automation model correctly but when I attempt to call a method on the exposed interface via Invoke it crashes.

I was wondering if anyone knew whether this was expected behaviour, i.e. I'm violating some basic sandboxi开发者_StackOverflow中文版ng requirement, or whether this should work and it is just something in my implementation that needs correcting? Cheers.

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There is an alternate hosting model available, details on MSDN: http://msdn.microsoft.com/en-us/library/dd550717(v=VS.95).aspx

It is very involved to use these methods, but you might just need to do that.

Here's the Silverlight agcore COM reference: http://msdn.microsoft.com/en-us/library/cc296246(v=VS.95).aspx

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To answer my question, yes this is possible and exactly as per my question's description. The caveat turned out to be that Silverlight doesn't provide an event corresponding to when a call to the IDispatch interface will succeed, e.g. when it's initialized "enough" to correctly respond.

Upon stopping my attempts on load events (e.g. OnLoad, OnPageComplete, etc) and making it a manual step off a button or similar I could successfully access the IDispatch interface.