load-file-async-coroutine.cpp

future<shared_ptr<GraphNode>> RootPageViewModel::LoadFileAsync()
{
    auto fop = ref new FileOpenPicker();
    fop->FileTypeFilter->Append(".glb");
    fop->FileTypeFilter->Append(".gltf");

    auto file = co_await fop->PickSingleFileAsync();

    if (file == nullptr)
        co_return nullptr;

    auto ret = co_await ModelFactory::Instance().CreateFromFileAsync(file->Path);

    co_return ret;
}