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part of MVC and covers many of the concepts you'd use in a larger
application.
In this book, you'll build a to-do app that lets the user add items to their
to-do list and check them off once complete. More specifically, you'll be
creating:
A web application server (sometimes called the "backend") using
ASP.NET Core, C#, and the MVC pattern
A database to store the user's to-do items using the SQLite database
engine and a system called Entity Framework Core
Web pages and an interface that the user will interact with via their
browser, using HTML, CSS, and JavaScript (called the "frontend")
A login form and security checks so each user's to-do list is kept
private
Sound good? Let's built it! If you haven't already created a new ASP.NET
Core project using dotnet new mvc , follow the steps in the previous
chapter. You should be able to build and run the project and see the
default welcome screen.
21
Create a controller
Create a controller
There are already a few controllers in the project's Controllers directory,
including the HomeController that renders the default welcome screen
you see when you visit http://localhost:5000 . You can ignore these
controllers for now.
Create a new controller for the to-do list functionality, called
TodoController , and add the following code:
Controllers/TodoController.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
namespace AspNetCoreTodo.Controllers
{
public class TodoController : Controller
{
// Actions go here
}
}
Routes that are handled by controllers are called actions, and are
represented by methods in the controller class. For example, the
HomeController includes three action methods ( Index , About , and
Contact ) which are mapped by ASP.NET Core to these route URLs:
localhost:5000/Home -> Index()
localhost:5000/Home/About -> About()
localhost:5000/Home/Contact -> Contact()
22
Create a controller
There are a number of conventions (common patterns) used by ASP.NET
Core, such as the pattern that FooController becomes /Foo , and the