private async Task <bool> IsListedAsync(CatalogEntry entry)
{
var details = await entry.GetPackageDetailsAsync();
var listedProperty = details.Property("listed");
if (listedProperty != null)
{
return((bool)listedProperty.Value);
}
var publishedProperty = details.Property("published");
var published = DateTimeOffset.Parse((string)publishedProperty.Value);
return(published.ToUniversalTime().Year != 1900);
}