Collection View Source

Discussion created by jaykappy on Feb 1, 2011
Latest reply on Feb 4, 2011 by meconfused
I am trying to Sort the results from a buffer using Collection View Source...I think I am on the right path here but cant seem to get the sort to perform or refresh the listbox.
In this case I am trying to sort by the Buffer Distance being created fro each selected feature found inside the buffer
Note: BUFFER_DISTANCE is not a field in the feature...its being created or set below in blue

Any quick thoughts?

    Private Sub QueryTask_ExecuteCompletedBuffer2(ByVal sender As Object, ByVal args As QueryEventArgs)

      ' Set up the collection View Source in order to Sort the results of the query by DISTANCE      
                Dim cs As New CollectionViewSource
                cs.SortDescriptions.Add(New SortDescription("BUFFER_DISTANCE", ListSortDirection.Ascending))
                cs.Source = args.FeatureSet.Features       
     ' Apply the sort to the listbox      
                imageListBuffer.ItemsSource = cs.View       
     ' refresh the listbox       

        Dim featureSet As FeatureSet = args.FeatureSet
        imageListBuffer.ItemsSource = args.FeatureSet.Features

        ' Set the Buffer Variable for the Center Point of the buffer to a MAPPOINT not String to the variable being set
        ' in the GeometryService_BufferCompleted2...the Variable is globally define at the to of the code page
        Dim _XYLocationBuffer As MapPoint = Nothing
        _XYLocationBuffer = _XYLocation

        If args.FeatureSet.Features.Count < 1 Then
            MessageBox.Show("No features found")
        End If
        For Each selectedGraphic As Graphic In args.FeatureSet.Features
            selectedGraphic.Symbol = TryCast(LayoutRoot.Resources("DefaultMarkerSymbol"), ESRI.ArcGIS.Client.Symbols.Symbol)

            ' Get the center point of each selected graphic found in the buffer
            Dim c As ESRI.ArcGIS.Client.Geometry.MapPoint = selectedGraphic.Geometry.Extent.GetCenter()
            ' Call the GetDistance Function...Set the Distance to the BUFFER_DISTANCE variable for each graphic, for display in the listbox           
             selectedGraphic.Attributes("BUFFER_DISTANCE") = GetDistance(_XYLocationBuffer, c)
Next selectedGraphic

    End Sub