Can someone show me a system-enumerable that I can access quickly as an ItemsSource to get test-data. I do not care what type it returns. The amount of data is also not very relevant, 100 or 10000 items, I do not care.
The desired markup would then look something like the code below and idealy does not need any namespace-declaration:
<ListBox ItemsSource="{x:Static ASystemEnumerableThatReturnsSomeObjects}"/>