src/NetCoreBBS/Areas/Admin/Controllers/TopicRepliesController.cs

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.Rendering;
using Microsoft.EntityFrameworkCore;
using NetCoreBBS.Infrastructure;
using Microsoft.AspNetCore.Authorization;

namespace NetCoreBBS.Areas.Admin.Controllers
{
    [Area("Admin")]
    [Authorize("Admin")]
    public class TopicRepliesController : Controller
    {
        private readonly DataContext _context;

        public TopicRepliesController(DataContext context)
        {
            _context = context;    
        }

        // GET: TopicReplies
        public async Task<IActionResult> Index(int id)
        {
            var topicreplys = _context.TopicReplys.Where(r => r.TopicId == id).ToListAsync();
            return View(await topicreplys);
        }
        // GET: TopicReplies/Delete/5
        public async Task<IActionResult> Delete(int? id)
        {
            if (id == null)
            {
                return NotFound();
            }

            var topicReply = await _context.TopicReplys.SingleOrDefaultAsync(m => m.Id == id);
            if (topicReply == null)
            {
                return NotFound();
            }
            var topic = await _context.Topics.SingleOrDefaultAsync(r => r.Id == topicReply.TopicId);
            topic.ReplyCount -= 1;
            _context.Topics.Update(topic);
            _context.TopicReplys.Remove(topicReply);
            await _context.SaveChangesAsync();
            return NoContent();
        }
    }
}