Professional C# and .NET, 2021st Edition

25Services

WHAT'S IN THIS CHAPTER?

• Overview of the ASP.NET Core web API
• Creating web API controllers
• Creating .NET clients calling REST APIs
• Using Entity Framework Core with services
• Handling authorization and authentication with REST Services
• Creating gRPC services and clients
• Streaming with gRPC
• Implementing Azure functions

CODE DOWNLOADS FOR THIS CHAPTER

The source code for this chapter is available on the book page at www.wiley.com. Click the Downloads link. The code can also be found at https://github.com/ProfessionalCSharp/ProfessionalCSharp2021 in the directory 3_Web/Services.

The code for this chapter is divided into the following major examples:

• BooksApi
• BooksData
• BooksDataAndAuthentication
• GRPC
• AzureFunctions

All the sample projects have nullable reference types enabled.

UNDERSTANDING TODAY'S SERVICES

Once upon a time, Windows Communication Foundation (WCF) tried to offer all functionality needed by services. You could create services returning XML or binary data, asynchronous communication was offered by message queuing, and UDP could be used as well, and it was all based on SOAP standards. Everything was possible, and you could configure every option. The issue with that situation was that even seemingly simple scenarios often became quite complex.

Today, we are back to many different options. Microservices can be implemented with different technologies. You can use a request/reply pattern or a disconnected scenario to send messages to a queue ...