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Kees
60
Sort rows, move rows with an empty value to the end
posted

 Situation:

    I have a grid with columns "NAME" and "DATE". When sorting (ascending) on date, all rows without a date should be placed at the end of the rowcollection (like when sorting descending).

    This is what i'm currently doing:

    Private Sub gridcandidates_AfterSortChange(ByVal sender As System.Object, ByVal e As Infragistics.Win.UltraWinGrid.BandEventArgs) Handles gridcandidates.AfterSortChange

        Dim col As UltraGridColumn = e.Band.Columns("DATE")
        If col.SortIndicator = SortIndicator.Ascending Then
            For i As Integer = gridcandidates.Rows.Count - 1 To 0 Step -1
            If Not IsDBNull(gridcandidates.Rows(i).Cells("DATE").Value) Then
                gridcandidates.Rows.Move(gridcandidates.Rows(i), 0) 'Move row to beginning
            Else
                gridcandidates.Rows.Move(gridcandidates.Rows(i), gridcandidates.Rows.Count - 1) 'Move row to end
            End If
        Next
        End If

    End Sub

 

Question/problems:

    - It messes up the sort... the columns aren't sorted by date.

    - Is there anyway to improve the code? I'm sure i'm overlooking something!

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  • 469350
    Verified Answer
    Offline posted

    I think the actual sorting process may be asynchronous, so the rows might not actually be sorted by the time AfterSortChange fires. 

    You might be better off applying a SortComparer to the column. Your custom SortComparer class would have to know whether the column is being sorted Ascending or Descending (you could set a property on it from the BeforeSortChange event of the grid) and then sort the null values as higher or lower depending on the sort direction. 

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