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Home > Programming > Programming Language > Programming APIs with C# and .NET
Programming APIs with C# and .NET
Programming APIs with C# and .NET

Programming APIs with C# and .NET: Develop high-performance APIs that ensure seamless application communication and enhanced security

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Programming APIs with C# and .NET

What We’ll Build

In this chapter, we will provide a context for the rest of the book. That context is a simple application for buying and selling cars. We will not build out this application but, in fact, we’ll have only one type of object (Car) and one table in our database. This will allow us to focus on the API rather than getting hung up on database design.

In this chapter, we’re going to cover the following main topics:

  • What an API is and what it is for
  • The backend database that we will use throughout the book
  • The application that we will build throughout the book
  • The Car object that we will use to demonstrate CRUD operations

We will use only free software, as shown in the Technical requirements section, and we will take advantage of open source utilities such as Dapper and AutoMapper, both introduced in Chapter 1.

Technical requirements

For this chapter, you’ll need Visual Studio and SQL Server Management Studio (SSMS), as well as Postman. Remember that SSMS was installed with Visual Studio.

Note that you can also manage your database from within Visual Studio using the Server Explorer and the SQL Server Object Explorer.

The code files for this book are available in the book’s GitHub repository : https://github.com/PacktPublishing/Programming-APIs-with-C-Sharp-and-.NET/tree/main/Chapter02

What is an API and what is it for?

The purpose of an API is to decouple the backend of an application (e.g., a database) from the frontend (e.g., a web application or mobile application), as illustrated in Figure 2.1.

Figure 2.1 – Separation of concerns

Figure 2.1 – Separation of concerns

The client does not talk directly to the database but rather talks to the API, which, in turn, talks to the database. The huge advantage of this approach is that you can modify the database and the client does not have to change. Alternatively, you can modify the front end (for example, a website) without changing the database.

These modifications take place throughout the development of a large project and continue after delivery. It is imperative, especially with a mobile application, that you can modify the backend without forcing the user to update the application. Even with web applications, however, this can be critical, as the team maintaining the database may well not be the team maintaining...

The application

The database we’ll be creating will be used in a simple (fictional) application for buying and selling cars. The database will keep a list of automobiles along with details of their engine, performance, and so on. A short example of this data is shown in Figure 2.2.

Figure 2.2 – A subset of the data table we’ll be using

Figure 2.2 – A subset of the data table we’ll be using

Creating the Car Table

The data for the Car table is from the free Automobile dataset at https://kaggle.com. Download the data and import it into a database named Cars and a table named Car. The columns should take care of themselves.

The datasets on Kaggle change frequently, so your list of cars may look a bit different. All the datasets are all presented as .csv files, so just download one and open SSMS in order to do the import. Here are the steps:

  1. Log into SSMS and create a database.
  2. Create a table named CARS.
  3. Start the Import Data Wizard. To do so, right-click on the table...

Database structure

Our database consists of just one table: Car. As shown in Figure 2.2, that table must store various attributes of each car (name, miles per gallon, number of cylinders, and so on). Figure 2.3 shows the table:

Figure 2.3 – Car table columns

Figure 2.3 – Car table columns

Notice the is_deleted column. We’ll be using “soft delete” – that is, rather than removing a row on deletion we’ll just set is_deleted to true (1). That allows us to easily restore that column just by changing that value back to 0 (false).

Other than id, all of the columns are strings, which will make working with them easier.

Car object

Corresponding to the Car table, our code has a Car entity (Cars/Data/Entities/Car.cs):

namespace Cars.Data.Entities;
public class Car
{
    public int Id { get; set; }
    public string name { get; set; } = null!;
    public string mpg { get; set; } = null...

The ASP.NET application

To get started, create a new ASP.NET project using the ASP.NET Core Web API template. Put the files wherever is convenient for you and choose the latest version of .NET (this book was written with .NET 8).

The basic structure of our application will be as follows:

  • Controllers with endpoints
  • Services
  • Repositories

We’ll review endpoints and all the rest of this as we go.

Program.cs

You won’t have to edit Program.cs for this application but it is worth a few minutes of your time to review it:

using Cars.Data;
using Cars.Data.Interfaces;
using Cars.Data.Repositories;
var builder = WebApplication.CreateBuilder(args);
// Add services to the container.
builder.Services.AddControllers();
// Learn more about configuring Swagger/OpenAPI at https://aka.ms/aspnetcore/swashbuckle
builder.Services.AddEndpointsApiExplorer();
builder.Services.AddSwaggerGen();
// Load DB configuration and register the connection factory for 
...

Folders

To organize our application, we will create the following folders:

  • Controllers
  • Data
  • Interfaces
  • Repositories
  • Services

Let’s briefly explain what these are:

  • The client is the application calling the API (for example, the website or mobile application). The Controllers folder will hold methods that act as endpoints (an endpoint is what the client connects to via a URL).
  • The Data folder will hold the definition of our entities – in our case, the Car object shown earlier.
  • The Interfaces folder is just what it sounds like: it will hold the interfaces to our C# objects.
  • The Repositories folder will hold the code between our methods and the database calls.
  • The Services folder will hold supporting code.

The flow will be as follows:

  1. The client calls a method in a controller.
  2. The method calls a service to handle the business logic.
  3. The service calls a method in the repository, which, in turn,...

Summary

In this chapter, you saw what an API is and how it is used to separate the front end (e.g., a web site) from the backend (e.g., a database). We also looked at the simple database and application that we’ll use throughout the book.

In order to demonstrate CRUD operations, we’ll build a simple application focused on a Car object as if we were working with an inventory of cars. We imported it from https://kaggle.com.

This lays the groundwork for the rest of the chapters and for the simple application that we will build. Our focus will be strictly on creating APIs, so we will spend little time on database technology or even on the frontend.

You try it

This is a good time to create your application and the database. If you are adventurous, create a similar but different application, database, and data entity. This will ensure that you cement the elements we’ll be using.

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Key benefits

  • Learn API design principles and architecture for high-performance applications
  • Develop robust APIs using best practices for security, scalability, and maintainability
  • Implement both traditional and minimal APIs with real-world scenarios
  • Purchase of the print or Kindle book includes a free PDF eBook

Description

APIs are at the heart of modern software development, enabling seamless communication between applications. In the C# and .NET ecosystem, mastering API development is key to building scalable, reliable systems that meet both client and enterprise needs. Written by C# and .NET experts Jesse Liberty and Joseph Dluzen, this book draws on their extensive experience as hands-on programmers to equip you with the tools, techniques, and best practices for creating powerful APIs. Starting with API fundamentals, it covers everything you need to design, build, and consume APIs using .NET technologies such as ASP.NET Core, and explores both controller and Function API implementations. You'll integrate essential tools such as Postman for testing to streamline your development workflow. Through practical examples and exercises, the book guides you from database creation to deploying APIs on Azure. By the end of this book, you’ll have gained real-world skills to develop secure, high-performance APIs that scale with your applications for both personal projects and enterprise-level systems.

Who is this book for?

This book is for .NET developers, software engineers, and backend developers looking to master API development using C# and ASP.NET Core. It caters to those with a basic understanding of C# and familiarity with the .NET ecosystem. Even though no prior experience with API frameworks is required, knowledge of ASP.NET Core will be helpful.

What you will learn

  • Understand core API concepts and how to apply them in .NET projects
  • Design RESTful APIs with a focus on scalability
  • Build APIs with ASP.NET Core
  • Explore alternative options for API development using Azure Functions, including stateful workflows with Durable Functions
  • Integrate databases into API projects, ensuring efficient data flow
  • Implement security measures such as authentication and authorization
  • Deploy APIs to Azure and learn the essentials of cloud integration
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Table of Contents

13 Chapters
Chapter 1: Getting Started Chevron down icon Chevron up icon
Chapter 1: Getting Started
Technical requirements
Where does the API fit in?
The players
Getting set up
Summary
You try it
Chapter 2: What We’ll Build Chevron down icon Chevron up icon
Chapter 2: What We’ll Build
Technical requirements
What is an API and what is it for?
The application
Database structure
The ASP.NET application
Folders
Summary
You try it
Chapter 3: Implementing with REST Chevron down icon Chevron up icon
Chapter 3: Implementing with REST
Technical requirements
REST
Using web protocols
Implementing REST in ASP.NET Core
Putting it all together (inserting a car)
Summary
You try it
Chapter 4: Documentation with Swagger Chevron down icon Chevron up icon
Chapter 4: Documentation with Swagger
Technical requirements
Setting up the Swagger documentation
Swagger for the controller
Running your API in Swagger
Summary
You try it
Chapter 5: Data Validation Chevron down icon Chevron up icon
Chapter 5: Data Validation
Technical requirements
Tuning your API
Paging
Validation
Capturing errors
Built-in validators
Summary
You try it
Chapter 6: Azure Functions Chevron down icon Chevron up icon
Chapter 6: Azure Functions
Technical requirements
Understanding Functions
Project walkthrough
Deploying
Summary
You try it
Chapter 7: Azure Durable Functions Chevron down icon Chevron up icon
Chapter 7: Azure Durable Functions
Technical requirements
Overview of Durable Functions
Summary
You try it
Chapter 8: Advanced Topics Chevron down icon Chevron up icon
Chapter 8: Advanced Topics
Technical requirements
Implementing an advanced API
Supporting implementation
Azure Storage Tables
Exploring the essentials
Introducing Microsoft Aspire
What have you learned, Dorothy?
Adding Aspire to an existing app
Summary
You try it
Chapter 9: Authentication and Authorization Chevron down icon Chevron up icon
Chapter 9: Authentication and Authorization
Technical requirements
Introduction to authentication and authorization
Overview of A&A
Summary
You try it
Chapter 10: Deploying to Azure Chevron down icon Chevron up icon
Chapter 10: Deploying to Azure
Technical requirements
Getting started
Deploying from DevOps
Deploying your artifact to Azure
Summary
You try it
Congratulations!
Chapter 11: What’s Next? Chevron down icon Chevron up icon
Chapter 11: What’s Next?
C#
Summary
Index Chevron down icon Chevron up icon
Index
Why subscribe?
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About the authors

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Profile icon Jesse Liberty
Jesse Liberty
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Jesse Liberty specializes in C#, Git, and building world-class APIs. He hosts the popular Yet Another Podcast and is the author of more than two dozen best-selling programming books. Jesse was a Technical Evangelist for Microsoft, Distinguished Software Engineer at AT&T; Software Architect for PBS, and Vice President of Information Technology at Citibank. He was also on the teaching staff at Brandeis University. Jesse has been a Microsoft MVP for 13 years. Jesse is a recognized expert and has spoken at conferences worldwide.
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Profile icon Joseph Dluzen
Joseph Dluzen
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Joseph Dluzen has been working in C# and associated frameworks for almost 20 years. He is currently in a software architecture role for one of the world's largest agricultural machine manufacturers. Formerly a senior consultant at Accenture, he has experience in a wide range of industries, including government identity, autonomous vehicle tooling, and enterprise auction management systems.
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Premium: Delivery to most Asian addresses within 5-9 business days

Disclaimer:
All orders received before 5 PM U.K time would start printing from the next business day. So the estimated delivery times start from the next day as well. Orders received after 5 PM U.K time (in our internal systems) on a business day or anytime on the weekend will begin printing the second to next business day. For example, an order placed at 11 AM today will begin printing tomorrow, whereas an order placed at 9 PM tonight will begin printing the day after tomorrow.


Unfortunately, due to several restrictions, we are unable to ship to the following countries:

  1. Afghanistan
  2. American Samoa
  3. Belarus
  4. Brunei Darussalam
  5. Central African Republic
  6. The Democratic Republic of Congo
  7. Eritrea
  8. Guinea-bissau
  9. Iran
  10. Lebanon
  11. Libiya Arab Jamahriya
  12. Somalia
  13. Sudan
  14. Russian Federation
  15. Syrian Arab Republic
  16. Ukraine
  17. Venezuela