Grouping with VirtualQueryableCollectionView not working

[Denis]

Hi!
I use VirtualQueryableCollectionView in my project (WPF Q3 2010).

public MainWindow()
{
    InitializeComponent();

    OraContext ctx = new OraContext();
    var view = new VirtualQueryableCollectionView(ctx.OSTs) { LoadSize = 5 };
    DataContext = view;
}

I get error, when grouping in GridView

Unable to cast object of type 'Telerik.OpenAccess.Query.GroupKeyAccessT' к типу 'OpenAccessRuntime.DataObjects.query.Node'

Thank you.

[Vlad]

Hello,

 Is this only with OpenAccess or you get the same problems with EF and/or Linq to SQL?

Best wishes,
Vlad
the Telerik team

[Denis]

Yes, this problem only with OpenAccess

[Petko_I]

Hello Denis,

Please, accept our apologies for the inconvenience caused. The query generated by the RadGridView for the grouping is one that we currently do not support with our LINQ implementation. However, we are addressing this issue and you can expect to see a fix in the next distribution of OpenAccess.  

For the time being, you can invoke the ToList() method of the IQueryable collection and proceed with development and experimentation:

var view = new VirtualQueryableCollectionView(ctx.OSTs.ToList()) { LoadSize = 5 };

You will have to work temporarily with an in-memory collection until we deliver our fix.

Do not hesitate to contact us, should you have any questions.

All the best,
Petko_I
the Telerik team

[Denis]

Thanks