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programming_books_eng

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Index action name can be left out of the URL. You can customize this
behavior if you'd like, but for now, we'll stick to the default conventions.
Add a new action called Index to the TodoController , replacing the //
Actions go here comment:
public class TodoController : Controller
{
public IActionResult Index()
{
// Get to-do items from database
// Put items into a model
// Render view using the model
}
}
Action methods can return views, JSON data, or HTTP status codes like
200 OK and 404 Not Found . The IActionResult return type gives you
the flexibility to return any of these from the action.
It's a best practice to keep controllers as lightweight as possible. In this
case, the controller will be responsible for getting the to-do items from
the database, putting those items into a model the view can understand,
and sending the view back to the user's browser.
Before you can write the rest of the controller code, you need to create a
model and a view.
23
Create models
Create models
There are two separate model classes that need to be created: a model
that represents a to-do item stored in the database (sometimes called an
entity), and the model that will be combined with a view (the MV in
MVC) and sent back to the user's browser. Because both of them can be
referred to as "models", I'll refer to the latter as a view model.
First, create a class called TodoItem in the Models directory:
Models/TodoItem.cs
using System;
using System.ComponentModel.DataAnnotations;
namespace AspNetCoreTodo.Models
{
public class TodoItem
{
public Guid Id { get; set; }
public bool IsDone { get; set; }
[Required]
public string Title { get; set; }
public DateTimeOffset? DueAt { get; set; }
}
}
This class defines what the database will need to store for each to-do
item: an ID, a title or name, whether the item is complete, and what the
due date is. Each line defines a property of the class:
24
Create models