filtering and grouping ria services

2 posts, 0 answers
  1. David Ocasio
    David Ocasio avatar
    161 posts
    Member since:
    Nov 2009

    Posted 26 Jul 2010 Link to this post

    Ive copied the code from the q2 2010 silverlight 4 demo   for syncing the filters between the domain data source and the grid.

    I also see some code there for loading a collection with distinct values. it seems to me that this a bit of a cheat and the code is consuming the results of a query that is returning the distinct values. am i mistaken or is there some hidden functionality for gathering all the distinct values irregardless of the paging

    Private collection As New RadObservableCollection(Of String)()
            Private Sub RadGridView1_DistinctValuesLoading(sender As Object, e As Controls.GridView.GridViewDistinctValuesLoadingEventArgs)
                e.ItemsSource = collection
                Dim context As NorthwindDomainContext = DirectCast(DomainDataSource1.DomainContext, NorthwindDomainContext)
                Dim loadOperation As System.ServiceModel.DomainServices.Client.LoadOperation(Of DistinctValue) = context.Load(context.GetDistinctValuesQuery(e.Column.UniqueName))
                AddHandler loadOperation.Completed, AddressOf Me.Completed
            End Sub
            Private Sub Completed(sender As Object, e As EventArgs)
                Dim context As NorthwindDomainContext = DirectCast(DomainDataSource1.DomainContext, NorthwindDomainContext)
                Dim values As IEnumerable(Of String) = From i In context.DistinctValues.OfType(Of DistinctValue)() _
                    Select i.Value
            End Sub
            Private Sub DomainDataSource1_LoadedData(sender As Object, e As System.Windows.Controls.LoadedDataEventArgs)
                If e.HasError Then
                    'Avoid showing exceptions when data exceeds URI length limitations /e.g adding too many filter descriptors/
                End If
            End Sub
        End Class
    End Namespace
  2. Vlad
    Vlad avatar
    11100 posts

    Posted 27 Jul 2010 Link to this post


    The idea of this code is to call a server side method which will return all distinct values for specific column no matter of the paging. 

    Sincerely yours,
    the Telerik team
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