Current behavior 🐛

The targetType the IValueConverter received is null when bind back with a enum type.
EnumBindBack.zip

Expected behavior 🎯

No response

How to reproduce it (as minimally and precisely as possible) 🔬

No response

Workaround 🛠️

Use {Binding} instead of x:Bind

Renderer 🎨

• Skia
• Native

Implementation info

The issue stems from the fact that the x:Bind expression generates the following C# code:

global::Uno.UI.Xaml.BindingHelper.SetBindingXBindProvider(___b, ___t, ___ctx => ___ctx is global::EnumBindBack.MainPage ___tctx ? ((true, ___tctx.SelectedItem)) : (false, default), (___ctx, __value) => { if(___ctx is global::EnumBindBack.MainPage ___tctx) ___tctx.SelectedItem = (global::EnumBindBack.ItemEnum)global::Microsoft.UI.Xaml.Markup.XamlBindingHelper.ConvertValue(typeof(global::EnumBindBack.ItemEnum), __value); } , new [] {"SelectedItem"})

This code uses lambdas for value retrieval and bind back, but does not include information about the source property type.

Ultimately it seems we will need to add an additional parameter like sourceType, which will then flow to SetBindingXBindProvider method and will be used as the targetType for ConvertBack method.