public async Task <ActionResult> File(int contentId)
{
if (await IsGrantedAsync(PermissionNames.ContentChange))
{
CurrentUnitOfWork.DisableFilter(AbpDataFilters.SoftDelete, FilterNames.Approved);
}
var file = await _bookservice.GetFileAsync(contentId);
await _bookservice.AddViewerAsync(contentId);
return(file);
}