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Turning a Datagrid DataItem into an array.

Posted on 2004-09-24
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Last Modified: 2012-05-05
I have used this method to create an array of items from a datagrid row:

        Dim dg As DataGrid = CType(Page.FindControl("dgCharges"), DataGrid)
        Dim rowView As DataRowView = CType(dg.SelectedItem.DataItem, DataRowView)
        If Not rowView Is Nothing Then
            Dim itemArray As Array = rowView.Row.ItemArray

When running the code, the datagrid and it's selectedItem are found
but the DataItem is Nothing.  Why is this?  

If this won't work, how can I create an array of the cells from the DataGridItem?

Thanks.
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Question by:JeffDrummond
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Expert Comment

by:boulder_bum
ID: 12145188
I believe the way to do this is to get the DataKeys from the grid item, then search your DataSource for the proper row (assuming you've set up the primary key stuff properly):

Dim keyID As Integer = CType( MyDataGrid.DataKeys(dg.SelectedItem.ItemIndex), Integer )
myDataTable.Rows.Find( 'use key to find row

As to why dg.SelectedItem.DataItem is null, I vaguely remember something about it only being available during binding, but I have about 10% certainty on that memory, so don't take my word for it.
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boulder_bum earned 2000 total points
ID: 12145268
And if you want to use only the DataGrid cells, you can simply have a method to get the values from the controls (or access the values directly without a method):

Private Sub GetValues() As ArrayList
     Dim al As ArrayList = New ArrayList()
   
     al.Add( CType( dg.SelectedItem.Cells(0).Controls(1), TextBox ).Text )
     al.Add...
     etc...
End Sub
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Author Comment

by:JeffDrummond
ID: 12145513
The ArrayList works well for my purposes.  Thanks!
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Author Comment

by:JeffDrummond
ID: 12145524
And you may be right too about the DataItem only being available during databinding.
That's the only other time I've used it.
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