Version

2.0.240405.15

Summary

I have a uri with Chinese character and query string that needs to be parsed with Windows.Foundation.Uri. Using C++WinRT, it always returns me an empty result. But equivalent C# code does returns me expected result.

I have tried changing the file encoding to either UTF-8 and UTF-8 BOM, nothing worked.

Reproducible example

With C++WinRT, create a C++WinRT console application:

    winrt::Windows::Foundation::Uri uri{ LR"(myapp://open?file="C:/我.txt")" };
    winrt::Windows::Foundation::WwwFormUrlDecoder parsed{ uri.Query() };
    for (auto entry : parsed)
    {
        std::wcout << entry.Name().data() << L'\t' << entry.Value().data() << L'\n';
    }

With C#, create a UWP project:

            var uri = new Uri("myapp://open?file=\"C:/我.txt\"");
            var parsed = new WwwFormUrlDecoder(uri.Query);
            foreach (var entry in parsed)
            {
                Debug.WriteLine(entry);
            }

Expected behavior

C# result is expected:

Actual behavior

C++WinRT result:

Additional comments

Repro here