Add Image

[Javier Gonzalez de Aragon]

Hi.

I have a Listview control populated using a Datadapter. I want to display an image from an ImageList control. The index is based on a value in a column. How can I achieve this?

Thanks,

Javier

[Javier Gonzalez de Aragon]

I have found the way.

Private Sub lvLista_CellFormatting(sender As Object, e As Telerik.WinControls.UI.ListViewCellFormattingEventArgs) Handles lvLista.CellFormatting

    If TypeOf e.CellElement Is DetailListViewHeaderCellElement Then
        Return
    End If

    Dim dataCell As DetailListViewDataCellElement = e.CellElement

    Select Case e.CellElement.Data.HeaderText
        Case "Número"
            e.CellElement.TextAlignment = ContentAlignment.MiddleCenter
            dataCell.Text = Format(dataCell.Row(e.CellElement.Data.Name), "000000")
            e.CellElement.ImageIndex = dataCell.Row("Imagen")
        Case "Fecha"
            e.CellElement.TextAlignment = ContentAlignment.MiddleCenter
            dataCell.Text = Format(dataCell.Row(e.CellElement.Data.Name), "dd/MM/yyyy")
        Case Else
            e.CellElement.TextAlignment = ContentAlignment.MiddleLeft
    End Select

End Sub

[Plamen]

Hi Javier,

Thank you for writing.

While your approach will work and the image will be assigned correctly, I would suggest using the ItemDataBound event to assign your images for better performance. ItemDataBound event is fired when an item is data bound, while the formatting event is constantly fired. 

If you need more information about the control and its functionalities, feel free to take a look at our online documentation: http://www.telerik.com/help/winforms/listview-getting-started.html.

Should you have any further questions, do not hesitate to contact us.

Regards,
Plamen
the Telerik team

[Javier Gonzalez de Aragon]

I had previously tried that approach, but I couldn't find a way to retrieve the values from the columns I needed. Any ideas?

Thanks.

[Plamen]

Hi Javier,

Thank you for writing back.

In order to retrieve the desired value from the column, you can use the DataBoundItem property of the Item, which is in fact the DataRowView of this item. Here is an example:

Private Sub radListView1_ItemDataBound(sender As Object, e As ListViewItemEventArgs)
    Dim rowView As DataRowView = DirectCast(e.Item.DataBoundItem, DataRowView)
    e.Item.ImageIndex = CInt(rowView.Row("Imagen"))
End Sub

I hope that you find this information helpful. Let us know if you need anything else.

Regards,
Plamen
the Telerik team