In this module, you learned how to use Blazor components to handle UI events including how to set up two-way data bindings between UI elements and your code. You used what you learned to create a to-do list

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Learn how to build a to-do list with Blazor.

Learning objectives

In this module, you will:

• Learn to handle events from components and set up two-way data bindings.
• Create a to-do list page.

Prerequisites

• Knowledge of what Blazor is and how it works at the beginner level
• Basic knowledge of web app concepts
• C# and .NET experience at the beginner level

This module is part of these learning paths

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Learn how to build your first web app with Blazor.

Learning objectives

In this module, you will:

• Configure your local environment for Blazor development.
• Create a new Blazor web app project.
• Add component logic to a Blazor web app.

Prerequisites

• Knowledge of Blazor and how it works at the beginner level
• Basic knowledge of web app concepts
• C# and .NET experience at the beginner level

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Our pizza service supports CRUD operations for a list of pizzas. These operations are performed through HTTP verbs, which are mapped via ASP.NET Core attributes. As you saw, the HTTP GET verb is used to retrieve one or more items from a service. Such an action is annotated with the [HttpGet] attribute.

The following table shows the mapping of the four operations that you’re implementing for the pizza service:

HTTP action verb	CRUD operation	ASP.NET Core attribute
GET	Read	[HttpGet]
POST	Create	[HttpPost]
PUT	Update	[HttpPut]
DELETE	Delete	[HttpDelete]

You already saw how GET actions work. Let’s learn more about POST, PUT, and DELETE actions.

POST

To enable users to add a new item to the endpoint, you must implement the POST action by using the [HttpPost] attribute. When you pass the item (in this example, a pizza) into the method as a parameter, ASP.NET Core automatically converts any application/JSON sent to the endpoint into a populated .NET Pizza object.

Here’s the method signature of the Create method that you’ll implement in the next section:

C#Copy

[HttpPost]
public IActionResult Create(Pizza pizza)
{            
    // This code will save the pizza and return a result
}

The [HttpPost] attribute maps HTTP POST requests sent to http://localhost:5000/pizza by using the Create() method. Instead of returning a list of pizzas, as we saw with the Get() method, this method returns an IActionResult response.

IActionResult lets the client know if the request succeeded and provides the ID of the newly created pizza. IActionResult uses standard HTTP status codes, so it can easily integrate with clients regardless of the language or platform they’re running on.

ASP.NET Core action result	HTTP status code	Description
CreatedAtAction	201	The pizza was added to the in-memory cache. The pizza is included in the response body in the media type, as defined in the accept HTTP request header (JSON by default).
BadRequest is implied	400	The request body’s pizza object is invalid.

Fortunately, ControllerBase has utility methods that create the appropriate HTTP response codes and messages for you. You’ll see how those methods work in the next exercise.

PUT

Modifying or updating a pizza in our inventory is similar to the POST method that you implemented, but it uses the [HttpPut] attribute and takes in the id parameter in addition to the Pizza object that needs to be updated:

C#Copy

[HttpPut("{id}")]
public IActionResult Update(int id, Pizza pizza)
{
    // This code will update the pizza and return a result
}

Each ActionResult instance used in the preceding action is mapped to the corresponding HTTP status code in the following table:

ASP.NET Core action result	HTTP status code	Description
NoContent	204	The pizza was updated in the in-memory cache.
BadRequest	400	The request body’s Id value doesn’t match the route’s id value.
BadRequest is implied	400	The request body’s Pizza object is invalid.

DELETE

One of the easier actions to implement is the DELETE action, which takes in just the id parameter of the pizza to remove from the in-memory cache:

C#Copy

[HttpDelete("{id}")]
public IActionResult Delete(int id)
{
    // This code will delete the pizza and return a result
}

Each ActionResult instance used in the preceding action is mapped to the corresponding HTTP status code in the following table:

ASP.NET Core action result	HTTP status code	Description
NoContent	204	The pizza was deleted from the in-memory cache.
NotFound	404	A pizza that matches the provided id parameter doesn’t exist in the in-memory cache.

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In the previous exercise, you created a web application that provides sample weather forecast data, then interacted with it in the HTTP Read-Eval-Print Loop (REPL).

Before you dive in to writing your own PizzaController class, let’s look at the code in the WeatherController sample to understand how it works. In this unit, you learn how WeatherController uses the ControllerBase base class and a few .NET attributes to build a functional web API in a few dozen lines of code. After you understand those concepts, you’re ready to write your own PizzaController class.

Here’s the code for the entire WeatherController class. Don’t worry if it doesn’t make sense yet. Let’s go through it step by step.

C#Copy

using Microsoft.AspNetCore.Mvc;

namespace ContosoPizza.Controllers;

[ApiController]
[Route("[controller]")]
public class WeatherForecastController : ControllerBase
{
    private static readonly string[] Summaries = new[]
    {
        "Freezing", "Bracing", "Chilly", "Cool", "Mild", "Warm", "Balmy", "Hot", "Sweltering", "Scorching"
    };

    private readonly ILogger<WeatherForecastController> _logger;

    public WeatherForecastController(ILogger<WeatherForecastController> logger)
    {
        _logger = logger;
    }

    [HttpGet(Name = "GetWeatherForecast")]
    public IEnumerable<WeatherForecast> Get()
    {
        return Enumerable.Range(1, 5).Select(index => new WeatherForecast
        {
            Date = DateTime.Now.AddDays(index),
            TemperatureC = Random.Shared.Next(-20, 55),
            Summary = Summaries[Random.Shared.Next(Summaries.Length)]
        })
        .ToArray();
    }
}

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Create a RESTful service with ASP.NET Core controllers that supports create, read, update, and delete (CRUD) operations.

Learning objectives

In this module, you’ll:

• Create a web API project with ASP.NET Core controllers.
• Create an in-memory database for persisting products.
• Add support for CRUD operations.
• Test web API action methods from the command shell

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In the previous exercise, you created a web application that provides sample weather forecast data, then interacted with it in the HTTP Read-Eval-Print Loop (REPL).

Before you dive in to writing your own PizzaController class, let’s look at the code in the WeatherController sample to understand how it works. In this unit, you learn how WeatherController uses the ControllerBase base class and a few .NET attributes to build a functional web API in a few dozen lines of code. After you understand those concepts, you’re ready to write your own PizzaController class.

Here’s the code for the entire WeatherController class. Don’t worry if it doesn’t make sense yet. Let’s go through it step by step.

C#Copy

using Microsoft.AspNetCore.Mvc;

namespace ContosoPizza.Controllers;

[ApiController]
[Route("[controller]")]
public class WeatherForecastController : ControllerBase
{
    private static readonly string[] Summaries = new[]
    {
        "Freezing", "Bracing", "Chilly", "Cool", "Mild", "Warm", "Balmy", "Hot", "Sweltering", "Scorching"
    };

    private readonly ILogger<WeatherForecastController> _logger;

    public WeatherForecastController(ILogger<WeatherForecastController> logger)
    {
        _logger = logger;
    }

    [HttpGet(Name = "GetWeatherForecast")]
    public IEnumerable<WeatherForecast> Get()
    {
        return Enumerable.Range(1, 5).Select(index => new WeatherForecast
        {
            Date = DateTime.Now.AddDays(index),
            TemperatureC = Random.Shared.Next(-20, 55),
            Summary = Summaries[Random.Shared.Next(Summaries.Length)]
        })
        .ToArray();
    }
}

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When you browse to a webpage, the web server communicates with your browser by using HTML, CSS, and JavaScript. For example, If you interact with the page by submitting a sign-in form or selecting a buy button, the browser sends the information back to the web server.

In a similar way, web servers can communicate with a broad range of clients (browsers, mobile devices, other web servers, and more) by using web services. API clients communicate with the server over HTTP, and the two exchange information by using a data format such as JSON or XML. APIs are often used in single-page applications (SPAs) that perform most of the user-interface logic in a web browser. Communication with the web server primarily happens through web APIs.

REST: A common pattern for building APIs with HTTP

Representational State Transfer (REST) is an architectural style for building web services. REST requests are made over HTTP. They use the same HTTP verbs that web browsers use to retrieve webpages and send data to servers. The verbs are:

• GET: Retrieve data from the web service.
• POST: Create a new item of data on the web service.
• PUT: Update an item of data on the web service.
• PATCH: Update an item of data on the web service by describing a set of instructions about how the item should be modified. The sample application in this module doesn’t use this verb.
• DELETE: Delete an item of data on the web service.

Web service APIs that adhere to REST are called RESTful APIs. They’re defined through:

• A base URI.
• HTTP methods, such as GET, POST, PUT, PATCH, or DELETE.
• A media type for the data, such as JavaScript Object Notation (JSON) or XML.

An API often needs to provide services for a few different but related things. For example, our pizza API might manage pizzas, customers, and orders. We use routing to map URIs (uniform resource identifiers) to logical divisions in our code, so that requests to https://localhost:5000/pizza are routed to PizzaController and requests to https://localhost:5000/order are routed to OrderController.

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