Using IMap/IObservableMap as ItemsSource for ListView

Also posted here.

I’ve described the problem on StackOverflow already and also filed a docs issue before finding out that the docs are actually technically right.

To summarize, I can bind an IVector<T> to a ListView control just fine, but when I substitute it with an IMap<K,V> or IObservableMap<K,V> I get exceptions. As I’ve found out this is due to IMap<K,V> not implementing IIterable<IInspectable> which is what the ItemsSource property expects.

However, it is possible to use Dictionary in C# and everything works just fine, so there must be something else happening here. Do you know how to CLR handles this and how I can accomplish this in C++?

Steps to reproduce the bug

• Create a XAML ListView and bind an IMap<K, V> to ItemsSource property using x:Bind

Expected behavior The ListView shows key-value pairs the same way as when using a Dictionary in C#

Version Info

Windows 10 version	Saw the problem?
18363.476	Yes

Device form factor	Saw the problem?
Desktop	Yes

[kennykerr]

Here is a simple implementation that implements IIterable<IInspectable>, as has been suggested by the Xaml team. If someone can test this against Xaml and confirm that this provides the desired behavior then we can update C++/WinRT to do the same.

https://gist.github.com/kennykerr/6eace7378a1a06b5e2f21da127be102a

[lawabider]

Has anyone been able to display the Key and Value in a ListView? I’m not sure if my XAML is correct. I can only get a stringification of the KeyValuePair:

My XAML is:

Also the changes (e.g. Clear()) don’t seem to be showing up on the UI.