如何在C++/WinRT Win2D应用程序中正确调用CanvasBitmap::LoadAsync

#include <winrt/Windows.Foundation.h>
#include <winrt/Windows.Storage.h>
#include <winrt/Windows.Graphics.Imaging.h>
#include <winrt/Windows.UI.Xaml.Controls.h>
#include <winrt/Windows.UI.Xaml.Media.Imaging.h>

using namespace winrt;
using namespace Windows::Foundation;
using namespace Windows::Storage;
using namespace Windows::Graphics::Imaging;
using namespace Windows::UI::Xaml::Controls;
using namespace Windows::UI::Xaml::Media::Imaging;

IAsyncOperation<CanvasBitmap> LoadImageAsync()
{
    StorageFile file = co_await StorageFile::GetFileFromApplicationUriAsync(Uri(L"ms-appx:///Assets/image.jpg"));
    IRandomAccessStream stream = co_await file.OpenAsync(FileAccessMode::Read);
    SoftwareBitmap softwareBitmap = co_await BitmapFactory::ConvertStreamAsync(stream);
    return CanvasBitmap::CreateFromSoftwareBitmap(CanvasDevice::GetSharedDevice(), softwareBitmap);
}

CanvasBitmap bitmap = co_await LoadImageAsync();