Question

My WPF program uses a third party map package which has a WPF map control. My program needs to be able to run on a system which does not have this software installed, and it needs to be smart enough to recognize when the software is installed and use it. This means that I can’t include any XAML for the map control in my form’s XAML file or XAML parse exceptions are thrown.

I have a technique for determining if the software is installed. In my program’s initialization code, I set a property of the Application object called MapsAreInstalled to true if the mapping software is installed, and I set it to false if it is not.

In my form, which is a UserControl, I’ve added an override of the OnApplyTemplate method. This checks the value of the MapsAreInstalled property and creates a new map control if the value is true. Here’s the XAML that I was using to create this control before it became obvious that I had to change my approach:

<telogis:MapControl ButtonBase.Click="CarImage_Click"
                    Canvas.Left="0"
                    Canvas.Top="0"
                    Center="41.366674544084,-73.6112966322899"
                    DragBehavior="None"
                    Heading="0"
                    Height="{Binding ElementName=ChannelCanvas, Path=ActualHeight}"
                    MapQuality="Perfect"
                    Name="ReadMap"
                    Perspective="TwoD"
                    RenderLabels="True"
                    UiEnable="True"
                    Width="{Binding ElementName=ChannelCanvas, Path=ActualWidth}"
                    Zoom="50" />

I know how to initialize all of these properties in the code behind EXCEPT the ButtonBase.Click event handler. How do I set this up in the code-behind?

Tony

Answer 1

I found the answer to this one:

RoutedEventHandler clickHandler = MyClickHandler;
mapCtrl.AddHandler( ButtonBase.ClickEvent, clickHandler );

Thanks anyway.