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    <p>I too am struggling with the bi-directional sync of two collections for use with WPF via MVVM. I blogged <a href="http://blog.alner.net/archive/2010/02/09/mvvm-to-wrap-or-not-to-wrap.aspx" rel="nofollow noreferrer">MVVM: To Wrap or Not to Wrap? How much should the ViewModel wrap the Model? (Part 1)</a> and <a href="http://blog.alner.net/archive/2010/02/09/mvvm-to-wrap-or-not-to-wrap-should-viewmodels-wrap.aspx" rel="nofollow noreferrer">MVVM: To Wrap or Not to Wrap? Should ViewModels wrap collections too? (Part 2)</a> regarding the question, including some sample code that shows a two way sync. However, as noted in the posts, the implementation is not ideal. I would qualify it as a proof of concept.</p> <p>I like the <a href="http://clinq.codeplex.com/" rel="nofollow noreferrer">BLINQ</a>, <a href="http://clinq.codeplex.com/" rel="nofollow noreferrer">CLINQ</a>, and <a href="http://obtics.codeplex.com/" rel="nofollow noreferrer">Obtics</a> frameworks that Alex_P posted about. These are a very nice way to get one side of the sync behvaior. Maybe the other side (from VM to Model) can be implemented via an alternate path? I just posted <a href="http://blog.alner.net/archive/2010/02/09/mvvm-to-wrap-or-not-to-wrap-blinq-and-clinq.aspx" rel="nofollow noreferrer">part 3</a> on my blog that discusses some of this. </p> <p>From what I can see, bi-directional via BLINQ and CLINQ is not supported in cases where the LINQ statement projects the data to a new structure. </p> <p>However, it does look like CLINQ may support Bi-Directional syncing in cases where the LINQ query returns the same datatype as the underlying collection. This is more of a filtering scenario, which doesn't match the use case of a ViewModel wrapping the data in the Model.</p>
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    1. COglad to see I am not the only person wrestling with this issue :) I am coming to the conclusion that VM collections should be readonly, and then use another mechanism such as command to add/remove. I have yet to POC this though
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