public ActionResult LikeMethod(string userId, int postId)
        {
            var userLike = _context.Publications.FirstOrDefault(u => u.UserId == userId);
            if (ModelState.IsValid)
            {
                if (userLike != null)
                {
                    userLike.Like = userLike.Like + 1;
                    userLike.UserId = userId;
                    userLike.Id = postId;

                    _context.Update(userLike);
                    _context.SaveChangesAsync();
                    return RedirectToAction(nameof(Index));
                }
            }

            return View();
        }

public ActionResult SubscriptionMethod(string userId, int postId)
        {
            var userLike = _context.Publications.FirstOrDefault(u => u.UserId == userId);
            if (ModelState.IsValid)
            {
                if (userLike != null)
                {
                    userLike.Subscription = userLike.Subscription + 1;
                    userLike.UserId = userId;
                    userLike.Id = postId;

                    _context.Update(userLike);
                    _context.SaveChangesAsync();
                    return RedirectToAction(nameof(Index));
                }
            }

            return View();
        }

[HttpPost]
        public async Task<IActionResult> Comment(int postId, string userId, string content, Comment comment)
        {
            var publ = _context.Publications.FirstOrDefault(c => c.Id == comment.PostId);
            if (publ != null) comment.ImageUrl = publ.ImageUrl;

            if (ModelState.IsValid)
            {
                var user = await _userManager.GetUserAsync(User);
                var comm = new Comment
                {
                    UserId = userId,
                    PostId = postId,
                    Content = content,
                    CommentDate = DateTime.Now
                };
                comm.UserId = user.Id;
                _context.Add(comm);
                await _context.SaveChangesAsync();
                return RedirectToAction(nameof(Index));
            }

            return View();
        }

<table>
    <tbody>
    <div class="row">
        <div class="col-lg-12">
            <a onclick="openCommentForm(@Model.Id)" style="cursor: pointer; color: darkslategray;">Оставить комментарий</a>
        </div>
        <div class="col-md-12" id="postdiv-@Model.Id" style="display: none; color: darkslategray;">
            <textarea id="posttext-@Model.Id"></textarea> <br/>
            <input type="button" id="postComment" onclick="sendComment('@Model.Id', '@Model.UserId')" value="Отправить"/>
        </div>
    </div>
    </tbody>
</table>

<script>
    function openCommentForm(postId) {
        $('#postdiv-' + postId).show();
    }

    function sendComment(postId, userId) {
        $.ajax({
            url: '@Url.Action("Comment", "Comments")',
            type: 'POST',
            data: { 'postId': postId, 'userId': userId, 'content': $('#posttext-' + postId).val() },
            success: function(data) {
                setTimeout(function() {
                        alert('Ваш комментарий ' + '(' + $('#posttext-' + postId).val() + ')' + ' добавлен!!!',
                            data)
                    },
                    500);
            },
            error: function() {
                console.log('Ошибка во время отправки комментария', this);
            }
        });
    }
</script>

<div id="postdiv-@Model.Id">
    <form>
        <input id="LikeId" type="button" value="Like" class="btn btn-default" onclick="sendLike('@Model.UserId', '@Model.Id')"
               style="color: aliceblue; background-color: darksalmon;"/>
        <input id="DisLikeId" type="button" value="Dislike" class="btn btn-default" onclick="sendDislike('@Model.UserId', '@Model.Id')"
               style="color: aliceblue; background-color: darksalmon;"/>
        <input id="subscribers-@Model.User" type="button" value="Subscribers" class="btn btn-default" onclick="SubScribers('@Model.UserId', '@Model.Id')"
               style="color: aliceblue; background-color: cadetblue;"/>
        <input id="unsubscribers-@Model.User" type="button" value="UnSubscribers" class="btn btn-default" onclick="UnSubScribers('@Model.UserId', '@Model.Id')"
               style="color: aliceblue; background-color: cadetblue;"/>
    </form>

</div>


<script>
    function SubScribers(userId, postId) {
        $.ajax({
            url: '@Url.Action("SubscriptionMethod", "Publications")',
            type: 'POST',
            data: { 'postId': postId, 'userId': userId },
            success: function(data) {
                setTimeout(function() {
                        alert('Вы подписались :)', data)},
                    500);
            },
            error: function() {
                console.log('Ошибка во время отправки комментария', this);
            }
        });
    }
</script>


<script>
    function sendLike(userId, postId) {
        $.ajax({
            url: '@Url.Action("LikeMethod", "Publications")',
            type: 'POST',
            data: { 'postId': postId, 'userId': userId },
            success: function(data) {
                setTimeout(function() {
                        alert('Вы поставили Like!', data)
                    },
                    500);
            },
            error: function() {
                console.log('Ошибка во время отправки комментария', this);
            }
        });
    }
</script>

public class Publication
    {
        public int Id { get; set; }

        [Display(Name = "Изображение")] public string ImageUrl { get; set; }
        [Display(Name = "Описание")] public string Description { get; set; }
        [Display(Name = "Нравиться!")] public int Like { get; set; }
        [Display(Name = "Подписка!")] public int Subscription { get; set; }

        public string UserId { get; set; }
        public ApplicationUser User { get; set; }

        [Display(Name = "Количество  комментариев")]
        public int ComentCount { get; set; }

        public List<Comment> CommentsList { get; set; }

    }

public class Comment
    {
        [Key] public int CommentId { get; set; }

        public string UserId { get; set; }
        public ApplicationUser User { get; set; }
        public int PostId { get; set; }
        public Publication Post { get; set; }
        public string Content { get; set; }
        public DateTime CommentDate { get; set; }

        [Display(Name = "Изображение")] public string ImageUrl { get; set; }
    }

[HttpPost]
        [ValidateAntiForgeryToken]
        public async Task<IActionResult> Create([Bind("CommentId,PostId,CommentDate")] Comment comment)
        {
            var publ = _context.Publications.FirstOrDefault(c => c.Id == comment.PostId);
            if (publ != null) comment.ImageUrl = publ.ImageUrl;


            if (ModelState.IsValid)
            {
                _context.Add(comment);
                await _context.SaveChangesAsync();
                return RedirectToAction(nameof(Index));
            }

            return View(comment);
        }

// GET: Comments/Details/5
        public async Task<IActionResult> Details(int id, PublicationVM model)
        {
            ViewBag.Comment = _context.Comments.Where(c => c.PostId == id);

            if (id == null)
            {
                return NotFound();
            }
            var comment = await _context.Comments
                .Include(c => c.Post)
                .Include(c => c.User)
                .SingleOrDefaultAsync(m => m.CommentId == id);
            if (comment == null)
            {
                return NotFound();
            }
            return View(comment);
        }

<td>
            <img src="~/@Model.ImageUrl" width="700" height="450"/>
        </td>

public class FileUploadService
    {
        public FileUploadService()
        {

        }
        public async void Upload(string path, string fileName, IFormFile file)
        {
            Directory.CreateDirectory(path);
            using (var stream = new FileStream(Path.Combine(path, fileName), FileMode.Create))
            {
                await file.CopyToAsync(stream);
            }
        }
    }