m

Controllers/CategoriesController.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using demoMvcCore.Models;
+using Microsoft.AspNetCore.Mvc;
+
+// For more information on enabling MVC for empty projects, visit https://go.microsoft.com/fwlink/?LinkID=397860
+
+namespace demoMvcCore.Controllers
+{
+    public class CategoriesController : Controller
+    {
+        // GET: /<controller>/
+        public IActionResult Index()
+        {
+            var categories = CategoryRepository.GetCategories();
+            return View(categories);
+
+        }
+
+        [HttpGet]
+        public IActionResult Edit([FromRoute]int? id)
+        {
+
+            ViewBag.OnClick = "edit";
+            var category = CategoryRepository.GetCategoryById(id ?? 0);
+            return View(category);
+
+
+        }
+
+        [HttpPost]
+        public IActionResult Edit(Category category)
+        {
+            if (ModelState.IsValid)
+            {
+                CategoryRepository.UpdateCategory(category.CategoryId, category);
+                return RedirectToAction(nameof(Index));
+            }
+            return View(category);
+        }
+
+
+        public IActionResult Add()
+        {
+            //ViewData["OnClick"] = "add";
+            ViewBag.OnClick = "add";
+            return View();
+        }
+
+        [HttpPost]
+        public IActionResult Add(Category category)
+        {
+            if(ModelState.IsValid)
+            {
+                CategoryRepository.AddCategory(category);
+                return RedirectToAction(nameof(Index));
+
+            }
+
+            return View(category);
+        }
+
+        [HttpGet]
+        public IActionResult Delete(int categoryId)
+        {
+            CategoryRepository.DeleteCategory(categoryId);
+            return RedirectToAction(nameof(Index));
+        }
+
+    }
+}
+

Controllers/HomeController.cs

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+using System.Diagnostics;
+using Microsoft.AspNetCore.Mvc;
+using demoMvcCore.Models;
+
+namespace demoMvcCore.Controllers;
+
+public class HomeController : Controller
+{
+    private readonly ILogger<HomeController> _logger;
+
+    public HomeController(ILogger<HomeController> logger)
+    {
+        _logger = logger;
+    }
+
+    public IActionResult Index()
+    {
+        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 });
+    }
+}
+

Models/Category.cs

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+using System;
+using System.ComponentModel.DataAnnotations;
+
+namespace demoMvcCore.Models
+{
+
+
+public class Category
+    {
+        public int CategoryId { get; set; }
+        [Required]
+        public string Name { get; set; } = string.Empty;
+
+        public string? Description { get; set; } = string.Empty;
+
+    }
+}
+

Models/CategoryRepositoruy.cs

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+using System;
+namespace demoMvcCore.Models
+{
+	public class CategoryRepository
+	{
+		public CategoryRepository()
+		{ }
+		private static List<Category> _categories = new List<Category>()
+			{ new Category {CategoryId = 1,Name="Beverage",Description="Beverage"},
+			 new Category {CategoryId = 2,Name="Snacks",Description="Snacks" } };
+
+		public static List<Category> GetCategories() => _categories;
+
+		public static void AddCategory(Category category)
+		{
+			var maxId = _categories.Max(x => x.CategoryId);
+			category.CategoryId = maxId + 1;
+			_categories.Add(category);
+		}
+        public static Category? GetCategoryById(int categoryId) =>
+            _categories.FirstOrDefault(x => x.CategoryId == categoryId);
+
+
+
+		public static void UpdateCategory(int id ,Category category)
+		{
+			var Category = _categories.FirstOrDefault(x => x.CategoryId==id);
+			if(Category is not null)
+			{
+				Category.Name = category.Name;
+				Category.Description = category.Description;
+			}
+		}
+
+		public static void DeleteCategory(int id)
+		{
+			var category = GetCategoryById(id);
+			if (category is not null)
+				_categories.Remove(category);
+
+		}
+
+
+
+    }
+	}
+
+

Models/ErrorViewModel.cs

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+namespace demoMvcCore.Models;
+
+public class ErrorViewModel
+{
+    public string? RequestId { get; set; }
+
+    public bool ShowRequestId => !string.IsNullOrEmpty(RequestId);
+}
+

Program.cs

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+var builder = WebApplication.CreateBuilder(args);
+
+// Add services to the container.
+builder.Services.AddControllersWithViews();
+
+var app = builder.Build();
+
+// Configure the HTTP request pipeline.
+if (!app.Environment.IsDevelopment())
+{
+    app.UseExceptionHandler("/Home/Error");
+    // The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
+    app.UseHsts();
+}
+
+app.UseHttpsRedirection();
+app.UseStaticFiles();
+
+app.UseRouting();
+
+app.UseAuthorization();
+
+app.MapControllerRoute(
+    name: "default",
+    pattern: "{controller=Home}/{action=Index}/{id?}");
+
+app.Run();
+

Properties/launchSettings.json

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+{
+  "$schema": "http://json.schemastore.org/launchsettings.json",
+  "iisSettings": {
+    "windowsAuthentication": false,
+    "anonymousAuthentication": true,
+    "iisExpress": {
+      "applicationUrl": "http://localhost:51613",
+      "sslPort": 44388
+    }
+  },
+  "profiles": {
+    "http": {
+      "commandName": "Project",
+      "launchBrowser": true,
+      "applicationUrl": "http://localhost:5285",
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      },
+      "dotnetRunMessages": true
+    },
+    "https": {
+      "commandName": "Project",
+      "launchBrowser": true,
+      "applicationUrl": "https://localhost:7030;http://localhost:5285",
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      },
+      "dotnetRunMessages": true
+    },
+    "IIS Express": {
+      "commandName": "IISExpress",
+      "launchBrowser": true,
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      }
+    }
+  }
+}

Views/Categories/Add.cshtml

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+@using demoMvcCore.Models
+@model Category
+@section title
+{
+    <h3>Add Category</h3>
+
+}
+
+<partial name="_Categories" model="@Model" />

Views/Categories/Edit.cshtml

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+@using demoMvcCore.Models
+@model Category
+@section title
+{
+    @if (Model is not null)
+    {
+        <h3>Category: @Model.Name </h3>
+        <p> Description: @Model.Description</p>
+    }
+}
+
+@if (Model is not null)
+    {
+    <partial name="_Categories" model="@Model" />
+    }
+
+
+
+
+

Views/Categories/Index.cshtml

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+
+@section title
+{
+    <h3>Categories</h3>
+}
+
+@model List<Category>
+@addTagHelper *,Microsoft.AspNetCore.Mvc.TagHelpers
+@if (Model is not null && Model.Count() > 0)
+{
+<table class="table table-striped">
+<thead>
+        <tr>
+<th> Name</th>
+<th> Description </th>
+<th></th>
+<th></th>
+</tr>
+</thead>
+<tbody>
+@foreach (var category in Model)
+    {
+    <tr>
+<td>@category.Name</td>
+<td>@category.Description</td>
+<td><a class="btn btn-link" asp-controller="categories" asp-action="edit" asp-route-id="@category.CategoryId">Edit</a></td>
+<td><a class="btn btn-link" asp-controller="categories" asp-action="delete" asp-route-categoryId="@category.CategoryId" onclick="return confirmDelete()">Delete</a></td>
+    </tr>
+    }
+</tbody>
+</table>
+
+<br/>
+
+<a class="btn btn-primary" asp-controller="categories" asp-action="add">Add</a>
+}
+    @section Scripts
+{
+<script>
+    function confirmDelete() {
+        return confirm("U sure you want to confirm?");
+    }
+</script>
+}

Views/Categories/_Categories.cshtml

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+@model Category
+
+@{
+    string onclick = ViewBag.OnClick ?? string.Empty;
+}
+
+
+<form method="post" asp-controller="categories" asp-action="@onclick">
+
+    @if (onclick?.ToLower() == "edit")
+        {
+    <input type="hidden" asp-for="@Model.CategoryId" />
+        }
+    <div class="tet-danger" asp-validation-summary="ModelOnly"></div>
+    <div class="row mb-3">
+        <div class="col-2">
+            <label asp-for="Name" class="col-form-label"></label>
+        </div>
+        <div class="">
+            <input type="text" asp-for="Name" class="form-control" />
+        </div>
+        <div class="col">
+            <span class="text-danger" asp-validation-for="Name"></span>
+
+        </div>
+
+    </div>
+    <div class="row mb-3">
+        <div class="col-2">
+            <label asp-for="Description" class="col-form-label"></label>
+        </div>
+        <div class="">
+            <input type="text" asp-for="Description" class="form-control" />
+        </div>
+        <div class="col">
+            <span class="text-danger" asp-validation-for="Description"></span>
+
+        </div>
+
+    </div>
+
+    <div class="row mb-3">
+        <div class="col-2">
+            <input type="submit" class="btn btn-primary" value="Save"></input>
+        </div>
+        <div class="">
+
+        </div>
+
+    </div>
+
+</form>