Custom item objects are unusable in AutoSuggestBox from C++ about microsoft-ui-xaml HOT 3 OPEN

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Open similar issues:

• ToString() is not called for custom ComboBox item (C++) (#8981), similarity score: 0.76
• [C++/WinRT] Two way binding from String to IInspectable not compiling (#4787), similarity score: 0.71

Closed similar issues:

• DisplayMemberPath not work when ComboBox items binded to DependencyObject (#8502), similarity score: 0.72
• AutoSuggestBox TextChanged reports reason as UserInput when programmatically setting AutoSuggextBox.Text in SuggestionChosen handler in C++ (and in C# as well under certain circumstances) (#3539), similarity score: 0.72

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from microsoft-ui-xaml.

Ah, for the *MemberPath properties there's an undocumented requirement to implement ICustomPropertyProvider, which is not implemented by default for C++/WinRT structs (perhaps it should be?)

This interface can also be used as a workaround for the buggy ToString() behavior, e.g.:

  auto Type() const {
    // Not just `YourClass` as you don't want the implementation namespace
    return xaml_typename<YourNamespace::YourClass>();
  }

  auto GetCustomProperty(const auto&) {
    return ICustomProperty {nullptr};
  }

  auto GetIndexedProperty(const auto&, const auto&) {
    return ICustomProperty {nullptr};
  }
  
  // Implement ToString() here
  hstring GetStringRepresentation();

from microsoft-ui-xaml.

For those who want DisplayMemberPath to work, you just need to add [bindable] to your runtimeclass. This would cause XC to generate all of the lookup code in XamlTypeInfo.g.cpp for your class.

Documentation says you only need bindable when you use Binding expression, which is false. Documentation needs to be updated to include use cases like this.

from microsoft-ui-xaml.