How do I refresh a custom provider?

[Jason D]

When my data changes, is there a way to force a refresh of a TiledProvider or TiledMapSource, short of removing the provider and adding it again?

[Andrey]

Hi Jason,

I think this is the correct way, but you can just reassign the provider instead of removing it and adding it again. The sample code is below.

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.Windows.RoutedEventArgs) Handles Button1.Click
    Dim loVedaProvider As New VedaProvider
    RadMap1.Providers.Item(1) = loVedaProvider
End Sub

The alternative is to invalidate tiles which are returned from the GetTile method using the InvalidateTileLayer method of the Tiled Map Source. Its implementation is more difficult and it will take more time than the above approach, because the InvalidateTileLayer method should be called for each tile.

Best wishes,
Andrey Murzov
the Telerik team

[Jason D]

I've tried re-assigning the layer a couple of times now, but with no success. It would be really nice to have a method to force a provider to refresh. For example, I found a bug (ticket coming later), where the provider wasn't being drawn. They only way I found to force it to redraw was by doing something that caused the layout to change:

moMap.Margin = New Windows.Thickness(1)
moMap.UpdateLayout()
moMap.Margin = New Windows.Thickness(0)

[Andrey]

Hi Jason,

Thank you for the feedback. We have created a PITS issue to fix the problem. You can track it using the following link:
http://www.telerik.com/support/pits.aspx#/public/wpf/7298

The map should be drawn automatically. As a workaround you can change the Center property of RadMap to re-draw the map. The sample code is below.

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.Windows.RoutedEventArgs) Handles Button1.Click
    Dim loVedaProvider As New VedaProvider
    RadMap1.Providers.Add(loVedaProvider)

    Dim center As Location = RadMap1.Center
    RadMap1.Center = New Location(0, 0)
    RadMap1.Center = center
End Sub

Best wishes,
Andrey Murzov
the Telerik team