Book Image

Learn C# Programming

By : Marius Bancila, Raffaele Rialdi, Ankit Sharma
5 (1)
Book Image

Learn C# Programming

5 (1)
By: Marius Bancila, Raffaele Rialdi, Ankit Sharma

Overview of this book

The C# programming language is often developers’ primary choice for creating a wide range of applications for desktop, cloud, and mobile. In nearly two decades of its existence, C# has evolved from a general-purpose, object-oriented language to a multi-paradigm language with impressive features. This book will take you through C# from the ground up in a step-by-step manner. You'll start with the building blocks of C#, which include basic data types, variables, strings, arrays, operators, control statements, and loops. Once comfortable with the basics, you'll then progress to learning object-oriented programming concepts such as classes and structures, objects, interfaces, and abstraction. Generics, functional programming, dynamic, and asynchronous programming are covered in detail. This book also takes you through regular expressions, reflection, memory management, pattern matching, exceptions, and many other advanced topics. As you advance, you'll explore the .NET Core 3 framework and learn how to use the dotnet command-line interface (CLI), consume NuGet packages, develop for Linux, and migrate apps built with .NET Framework. Finally, you'll understand how to run unit tests with the Microsoft unit testing frameworks available in Visual Studio. By the end of this book, you’ll be well-versed with the essentials of the C# language and be ready to start creating apps with it.
Table of Contents (20 chapters)

Chapter 16: C# in Action with .NET Core 3

The C# programming language is the medium that we use to turn ideas into runnable code. At compile time, the whole set of rules, grammar, constraints, and semantics get transformed into the Intermediate Language—a high-level assembly language used to instruct the Common Language Runtime (CLR), which in turn provides the necessary services to run the code.

In order to execute some code, native languages such as C, C++, and Rust require a thin runtime library to interact with the operating system (OS) and execute abstractions such as program loading, constructors, and deconstructors. On the other hand, higher-level languages such as C# and Java need a more complex runtime engine to provide other fundamental services such as garbage collection, just-in-time compilation, and exception management.

When .NET Framework was first created, the CLR was designed to run exclusively on Windows, but later, many other runtimes (implementing the...