With the {x:Bind}
markup syntax you can bind to events provided the method meets the following requirements:
This works perfectly fine outside of a DataTemplate. Once the binding happens inside the DataTemplate the compiler generates the following error:
Xaml Internal Error error WMC9999: Object reference not set to an instance of an object.
What is the fix for binding to events inside DataTemplates?
Full example code here.
Snippet of the example code below - note the first button (line 2) is fine and the second button (line 6) is also fine. If you comment out line 6 and and comment in line 7, the error occurs.
<StackPanel Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
<Button Tapped="{x:Bind Click}" Content="WORKING"/>
<ListView ItemsSource="{x:Bind Names}">
<ListView.ItemTemplate>
<DataTemplate x:DataType="local:Customer">
<Button Content="{x:Bind Title}"/>
<!--<Button Tapped="{x:Bind Clicky}" Content="{x:Bind Title}"/>-->
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
</StackPanel>
I was able to get it to work with the following code:
<DataTemplate x:DataType="local:Customer">
<StackPanel Orientation="Vertical">
<Button Tapped="{x:Bind Clicky}" Content="{x:Bind Title}" />
</StackPanel>
</DataTemplate>
It seems as though you need to have it inside a container for it work. I have no idea why I am guessing magic.