/// <summary>
/// 获取新闻评论。
/// </summary>
/// <param name="newsDetail">新闻内容。</param>
/// <param name="pageIndex">第几页，从 1 开始。</param>
/// <param name="pageSize">每页条数。</param>
/// <returns>新闻评论。</returns>
/// <exception cref="ArgumentNullException">新闻内容为 null。</exception>
public static async Task <IEnumerable <NewsComment> > CommentAsync(this NewsDetail newsDetail, int pageIndex, int pageSize)
{
if (newsDetail == null)
{
throw new ArgumentNullException(nameof(newsDetail));
}
return(await NewsService.CommentAsync(newsDetail.Id, pageIndex, pageSize));
}