WPF Object Reference not set to Instance of Object

Question

In Windows Presentation Foundation I am getting errors in the designer on this line:

<WindowsPresentation:GMapControl x:Name="MainMap" Zoom="13" MaxZoom="24" MinZoom="1" Margin="0,145,0,0" Height="Auto" VerticalAlignment="Stretch" HorizontalAlignment="Stretch" Width="Auto" />

However, the program runs just fine. I'm totally stumped. The designer also renders perfectly. It's just an error in the errors list.

The F in WPF is Foundation not Forms ;)

Miklós Balogh
– Miklós Balogh

2012-09-19 05:44:27 +00:00
Commented Sep 19, 2012 at 5:44 — Miklós Balogh
– Miklós Balogh, Commented Sep 19, 2012 at 5:44

John Saunders · Accepted Answer · 2014-05-15 19:08:09Z

3

Well, already found the solution.

It turns out that the amazing GMaps Control has a bug in which declaring Zoom in the WPF XAML syntax will raise a NullReferenceException. Removing this tag has fixed the issue:

<WindowsPresentation:GMapControl x:Name="MainMap" CanDragMap="True"  MaxZoom="24" MinZoom="1"  Margin="0,145,0,0" Height="Auto" VerticalAlignment="Stretch" HorizontalAlignment="Stretch" Width="Auto" />

I hope this helps someone with the same problem.

edited May 15, 2014 at 19:08

John Saunders

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answered Sep 19, 2012 at 4:12

Christian Stewart

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