WinRT Data Virtualization implementation in C#

Question

I have asked this question on the MSDN forum (with no success), maybe StackOverflow will prove its strength one more time...

I was attending Hamid Mahmood's session on collection and list apps and was excited to see control-level support for data virtualization. Unfortunately, no details were given on how to implement IVirtualizingVector and IIncrementalLoadingVector, and it is not evident how to do so by looking at the interfaces themselves. Can anybody post a sample?

Additional bonus question for SO - is there an easier way to implement IAsyncOperation (needed by IIncrementalLoadingVector implementation) than coding it "from scratch"?

Your bonus question doesn't seem to be related to the first one at all. Please try to ask one question at a time. — svick, Sep 26 '11 at 19:15
@svick Yes, it does. Implementing IIncrementalLoadingVector requires implementing IAsyncOperation. — Sergey Aldoukhov, Sep 26 '11 at 19:21
There is a sample project that has a class implementing `IVirtualizingVector` in "Basic Media Playback" sample. — Pavel Minaev, Sep 27 '11 at 20:56
@pavel-minaev The one in "Basic Media Playback" seems to be a dummy implementation - it always returns false from IsPlaceholder() — Sergey Aldoukhov, Sep 28 '11 at 04:16

score 3 · Answer 1 · answered Sep 26 '11 at 20:15

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For your bonus question, have a look at the overloaded Create method available in System.Runtime.InteropServices.WindowsRuntime.AsyncInfoFactory, specifically the overloads that take Func<Task<T>>.

answered Sep 26 '11 at 20:15

Pavel Minaev

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score 3 · Answer 2 · answered Dec 22 '11 at 22:33

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I have posted an article on my blog showing how to implement IVirtualizingVector here. It describes an overview of how IVirtualizingVector works, as well as an implementation that you can use released as part of the open-source Cocoon framework. I hope to also show how to use IIncrementalLoadingVector in the future.

answered Dec 22 '11 at 22:33

Andy Wilkinson

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I have used Andy's classes and they work well, btw Andy I posted a question on your blog :) – GONeale Apr 19 '12 at 23:44

WinRT Data Virtualization implementation in C#

2 Answers2