private async Task ZoomPdf()
{
    if (_pdfViewerRef == null) return;
    var type = _pdfViewerRef.GetType();
    var parameterTypes = new[] { typeof(PdfViewerZoomLevelDescriptor) };
    var dynMethod = type.GetMethod("ZoomAsync", BindingFlags.NonPublic | BindingFlags.Instance, parameterTypes);
    
    await (dynMethod?.Invoke(_pdfViewerRef, new object[] { GetZoomLevelDescriptor(_pdfViewerRef, type, "Fit to width") }) as Task ?? Task.CompletedTask);
}

private static PdfViewerZoomLevelDescriptor GetZoomLevelDescriptor(object? instance, IReflect type, string valueToFind)
{
    // Use reflection to get the ZoomLevels property
    var zoomLevelsProperty = type.GetProperty("ZoomLevels", BindingFlags.NonPublic | BindingFlags.Instance);

    if (zoomLevelsProperty == null)
    {
        throw new InvalidOperationException("ZoomLevels property not found.");
    }

    // Get the value of the ZoomLevels property
    var zoomLevelsValue = zoomLevelsProperty.GetValue(instance);

    // Ensure the value is of the correct type (List<PdfViewerZoomLevelDescriptor>)
    if (zoomLevelsValue is List<PdfViewerZoomLevelDescriptor> zoomLevels)
    {
        // Search for the descriptor with the specified value
        var descriptor = zoomLevels.FirstOrDefault(z => z.Value == valueToFind);

        return descriptor;
    }

    throw new InvalidOperationException("ZoomLevels property is not of the expected type.");
}