Add project files.

DiaryApp/Controllers/DiaryEntriesController.cs

@@ -0,0 +1,104 @@
+using DiaryApp.Data;
+using DiaryApp.Models;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.AspNetCore.Mvc.ModelBinding;
+
+namespace DiaryApp.Controllers
+{
+    public class DiaryEntriesController : Controller
+    {
+        private readonly ApplicationDbContext _db;
+
+        public DiaryEntriesController(ApplicationDbContext db) {
+            _db = db;
+        }
+        public IActionResult Index()
+        {
+            List<DiaryEntry> objDiaryEntryList = _db.DiaryEntries.ToList();
+
+            return View(objDiaryEntryList);
+        }
+
+        public IActionResult Create()
+        {
+            return View();
+        }
+
+        [HttpPost]
+        public IActionResult Create(DiaryEntry obj)
+        {
+            if (obj != null && obj.Title.Length < 3)
+            {
+                ModelState.AddModelError("Title", "The Title must be at least 3 characters long.");
+            }
+            if(ModelState.IsValid)
+            {
+                _db.DiaryEntries.Add(obj);
+                _db.SaveChanges();
+                return RedirectToAction("Index");
+            }
+            return View(obj);
+        }
+
+        [HttpGet]
+        public IActionResult Edit(int? id)
+        {
+            if(id== null || id == 0)
+            {
+                return NotFound();
+            }
+
+
+            DiaryEntry? diaryEntry = _db.DiaryEntries.Find(id);
+            if (diaryEntry == null)
+            {
+                return NotFound();
+            }
+
+            return View(diaryEntry);
+        }
+
+        [HttpPost]
+        public IActionResult Edit(DiaryEntry obj)
+        {
+            if (obj != null && obj.Title.Length < 3)
+            {
+                ModelState.AddModelError("Title", "The Title must be at least 3 characters long.");
+            }
+            if (ModelState.IsValid)
+            {
+                _db.DiaryEntries.Update(obj);
+                _db.SaveChanges();
+                return RedirectToAction("Index");
+            }
+            return View(obj);
+        }
+
+        [HttpGet]
+        public IActionResult Delete(int? id)
+        {
+            if (id == null || id == 0)
+            {
+                return NotFound();
+            }
+
+
+            DiaryEntry? diaryEntry = _db.DiaryEntries.Find(id);
+            if (diaryEntry == null)
+            {
+                return NotFound();
+            }
+
+            return View(diaryEntry);
+        }
+
+        [HttpPost]
+        public IActionResult Delete(DiaryEntry obj)
+        {
+            _db.DiaryEntries.Remove(obj);
+            _db.SaveChanges();
+            return RedirectToAction("Index");
+        }
+
+    }
+}

DiaryApp/Controllers/HomeController.cs

@@ -0,0 +1,30 @@
+using System.Diagnostics;
+using DiaryApp.Models;
+using Microsoft.AspNetCore.Mvc;
+
+namespace DiaryApp.Controllers
+{
+    public class HomeController : Controller
+    {
+        public IActionResult Index()
+        {
+            return View();
+        }
+
+        public IActionResult MyPage()
+        {
+            return View();
+        }
+
+        public IActionResult Privacy()
+        {
+            return View();
+        }
+
+        [ResponseCache(Duration = 0, Location = ResponseCacheLocation.None, NoStore = true)]
+        public IActionResult Error()
+        {
+            return View(new ErrorViewModel { RequestId = Activity.Current?.Id ?? HttpContext.TraceIdentifier });
+        }
+    }
+}