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Version: v1.2

📓 3.2.1.3 To Do List MVC Setup

Now that we've had basic practice with the Model-View-Controller aspect of MVC web apps, let's create a more complex ASP.NET Core MVC application. We'll then continue building upon this codebase throughout the remainder of the C# and .NET course.

Starter Project for To Do List​

We'll call our new project the "To Do List". It will be an application that tracks our to-dos. We'll start simple and just have one Item model that is meant to represent a single task on our To Do List. Later on we'll add a Category model that will represent different to-do lists within our application, like one for "School" or one for "Home Chores".

Since our goal is to practice with the ASP.NET Core MVC framework, we've put together a basic starter project for the "To Do List" app that contains the following:

  • An Item class within the ToDoList.Models namespace.
  • Full testing for the Item class. The tests will all be similar to those we wrote for the Triangle class in the Shape Tracker app.

To begin this walkthrough, clone down the following code from the default branch 1_mvc_setup. Then, take a moment to explore the files and folders and run the tests to make sure they are all passing.

Starter GitHub Repo for the "To Do List" Application

Implementing an MVC Web Interface​

We'll update this project to work with ASP.NET Core MVC. First we'll add the necessary components to our project structure.

  • In the ToDoList production project, create the following file:
    • Program.cs
  • Still within the ToDoList directory, create the following subdirectories:
    • Controllers
    • Views
  • In ToDoList/Controllers create a HomeController.cs file.
  • In ToDoList/Views create a Home subdirectory.
    • In this home subdirectory, create a single Index.cshtml file.
  • Finally, in the uppermost parent directory, ToDoList.Solution, create a .gitignore file.

The resulting structure should look like this:

ToDoList.Solution ├── .gitignore ├── ToDoList │   ├── Controllers │   │   └── HomeController.cs │   ├── Models │   │   └── Item.cs │   ├── Program.cs │   ├── Properties │   │   └── launchSettings.json │   ├── ToDoList.csproj │   └── Views │       └── Home │           └── Index.cshtml └── ToDoList.Tests ├── ModelTests │   └── ItemTests.cs └── ToDoList.Tests.csproj

Add ASP.NET Core MVC​

We'll also add the MVC framework package by updating the production project's .csproj file to include .Web in the Project SDK:

ToDoList/ToDoList.csproj
<Project Sdk="Microsoft.NET.Sdk.Web">
  <PropertyGroup>
    <TargetFramework>net6.0</TargetFramework>
  </PropertyGroup>
</Project>

Navigate to the ToDoList production project in the terminal and run $ dotnet restore.

Program.cs​

We'll populate ToDoList/Program.cs with the same general configuration code we've used so far:

ToDoList/Program.cs
using Microsoft.AspNetCore.Builder;
using Microsoft.Extensions.DependencyInjection;

namespace ToDoList
{
  class Program
  {
    static void Main(string[] args)
    {
      WebApplicationBuilder builder = WebApplication.CreateBuilder(args);

      builder.Services.AddControllersWithViews();

      WebApplication app = builder.Build();

      app.UseHttpsRedirection();

      app.UseRouting();

      app.MapControllerRoute(
        name: "default",
        pattern: "{controller=Home}/{action=Index}/{id?}"
      );

      app.Run();
    }
  }
}

Properties/launchSettings.json​

We'll populate ToDoList/Properties/launchSettings.json with the same general configuration we'll use in all of our projects.

ProjectName.Solution/ProjectName/Properties/launchSettings.json
{
  "profiles": {
    "development": {
      "commandName": "Project",
      "dotnetRunMessages": true,
      "launchBrowser": true,
      "applicationUrl": "https://localhost:5001;http://localhost:5000",
      "environmentVariables": {
        "ASPNETCORE_ENVIRONMENT": "Development"
      }
    },
    "production": {
      "commandName": "Project",
      "dotnetRunMessages": true,
      "launchBrowser": true,
      "applicationUrl": "https://localhost:5001;http://localhost:5000",
      "environmentVariables": {
        "ASPNETCORE_ENVIRONMENT": "Production"
      }
    }
  }
}

.gitignore​

Double check that there's a .gitignore file with the following folders listed within:

.gitignore
obj
bin

Let's also ensure any obj or bin directories already committed are no longer tracked by Git with the following commands in the top level of our project:

$ git rm --cached obj -r
$ git rm --cached bin -r

If you receive a did not match any files response, it means you're already ignoring these directories so there was nothing to remove from Git. This is normal.

Controller​

In the ToDoList/Controllers/HomeController.cs we'll add the standard import statements, namespace, and class:

ToDoList/Controllers/HomeController.cs
using Microsoft.AspNetCore.Mvc;
using ToDoList.Models;

namespace ToDoList.Controllers
{
  public class HomeController : Controller
  {


  }
}

In addition to the Microsoft.AspNetCore.Mvc namespace, we're also using our ToDoList.Models namespace. This grants access to our Item class in the controller.

Now we can add our first route:

ToDoList/Controllers/HomeController.cs
using Microsoft.AspNetCore.Mvc;
using ToDoList.Models;

namespace ToDoList.Controllers
{
  public class HomeController : Controller
  {

    [Route("/")]
    public ActionResult Index()
    {
      Item starterItem = new Item("Add first item to To Do List");
      return View(starterItem);
    }

  }
}

  • We create an Index() route method with a route decorator specifying a URL path of /, which means this is the root route for localhost:5000.

  • When the route is invoked, we create a placeholder Item to populate our To Do List. We can access Items because we are using ToDoList.Models; at the top of this file.

  • We pass starterItem into the View() method. Let's create a corresponding view now.

Views​

Add the following to Index.cshtml:

ToDoList/Views/Home/Index.cshtml
<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title>My To-Do List!</title>
    <link 
      href="https://cdn.jsdelivr.net/npm/bootstrap@5.2.3/dist/css/bootstrap.min.css" 
      rel="stylesheet" 
      integrity="sha384-rbsA2VBKQhggwzxH7pPCaAqO46MgnOM80zW1RWuH61DGLwZJEdK2Kadq2F9CUG65" 
      crossorigin="anonymous">
  </head>
  <body>
    <h1>To Do List</h1>
    <ul>
      <li>@Model.Description</li>
    </ul>
  </body>
</html>

We use @Model.Description to display the property of the starterItem object we passed into View() in the controller.

Launching the Project​

Let's check out the project in the browser. Enter the following command in the ToDoList directory (the production directory) to build and run the project:

$ dotnet watch run

Remember: because we're using a launchSettings.json with a development profile configured as the default profile, the above command will start our project in development mode, which enables Developer Exception Pages.

If we visit https://localhost:5001, our To Do List homepage loads correctly. If you get an error, you may not have your developer security certificate set up for HTTPS.