Listview templates not applying

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WPF

DataTemplate

Hi guys,

So I am working on a routine that validates and imports some data between two systems.

both routines output their results into a list of objects and I am trying to bind to this list in my GUI.

What I would like to achieve is that each type of result, be it a validation result or an import result to have its own data template.

For example:

Validation result should look like this:

 Number : Result

And import result should look like this:

Source No: Imported No: Printed

The issue I have is that my data template does not appear to be selected and I'm not sure why.

<ListView ItemsSource="{Binding Path=Results}">
	<ListView.Resources>
		<DataTemplate DataType="{x:Type customTypes:ValidationResult}">
			<StackPanel Orientation="Horizontal">
				<TextBlock Text="{Binding Path=InvoiceNumber}" />
				<TextBlock Text="{Binding Path=ResultString}" />
			</StackPanel>
		</DataTemplate>
	</ListView.Resources>
</ListView>

I'm sure I am missing something obvious, but I'm not sure what.

At this time I have only devised the data template for the ValidationResult, but this is because only validation is currently adding its results to the Results collection.


-----------------------------------------
Refinement

Just to add some additional information here.

I might have a results list that looks like this:

ValidationResult
ValidationResult
ImportResult
ImportResult

My list view is bound to a property of type ReadOnlyCollection<object>
which contains the result list.

My data template shown above is one of two different templates I want to use when displaying the items. However, at this time, even that single template is not displaying data. I have a listview, that clearly has items in as there are selectable items shown on screen, however they do not use the templates and I'm not sure why.