Book Image

C# 8.0 and .NET Core 3.0 – Modern Cross-Platform Development - Fourth Edition

By : Mark J. Price
Book Image

C# 8.0 and .NET Core 3.0 – Modern Cross-Platform Development - Fourth Edition

By: Mark J. Price

Overview of this book

In C# 8.0 and .NET Core 3.0 – Modern Cross-Platform Development, Fourth Edition, expert teacher Mark J. Price gives you everything you need to start programming C# applications. This latest edition uses the popular Visual Studio Code editor to work across all major operating systems. It is fully updated and expanded with new chapters on Content Management Systems (CMS) and machine learning with ML.NET. The book covers all the topics you need. Part 1 teaches the fundamentals of C#, including object-oriented programming, and new C# 8.0 features such as nullable reference types, simplified switch pattern matching, and default interface methods. Part 2 covers the .NET Standard APIs, such as managing and querying data, monitoring and improving performance, working with the filesystem, async streams, serialization, and encryption. Part 3 provides examples of cross-platform applications you can build and deploy, such as web apps using ASP.NET Core or mobile apps using Xamarin.Forms. The book introduces three technologies for building Windows desktop applications including Windows Forms, Windows Presentation Foundation (WPF), and Universal Windows Platform (UWP) apps, as well as web applications, web services, and mobile apps.
Table of Contents (21 chapters)

Documenting and testing web services

You can easily test a web service by making HTTP GET requests, using a browser. To test other HTTP methods, we need a more advanced tool.

Testing GET requests using a browser

You will use Chrome to test the three implementations of a GET request: for all customers, for customers in a specified country, and for a single customer using their unique customer ID:

  1. In Terminal, start the NorthwindService Web API web service by entering the following command: dotnet run
  2. In Chrome, navigate to https://localhost:5001/api/customers and note the JSON document returned, containing all the 91 customers in the Northwind database, as shown in the following screenshot:
  3. Navigate to https://localhost:5001/api/customers/?country=Germany and note the JSON document returned, containing only the customers in Germany, as shown in the following screenshot:

    If you get an empty array returned, then make sure you have entered the country name using the...