public async Task <IActionResult> Comment([Bind("ID, ArticleID, CreateTime, NickName, Content")] Comment comment)
        {
            if (ModelState.IsValid)
            {
                comment.CreateTime = DateTime.Now;

                _context.Add(comment);
                await _context.SaveChangesAsync();
            }
            return(RedirectToAction(nameof(ReadArticle), new { id = comment.ArticleID }));
        }
        public async Task <IActionResult> Create([Bind("ID,Title,CreateTime,LastModifyTime,MarkdownContent,HTMLContent")] Article article)
        {
            if (ModelState.IsValid)
            {
                // 设置时间
                DateTime now = DateTime.Now;
                article.CreateTime     = now;
                article.LastModifyTime = now;

                // 生成 HTML
                BuildArticle(article);

                _context.Add(article);
                await _context.SaveChangesAsync();

                return(RedirectToAction(nameof(Index)));
            }
            return(View(article));
        }