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)

Namespaces

We have mentioned namespaces several times in this book already without explaining what they really are. Namespaces are used to organize your code in logical units. A namespace defines a declaration space that contains types. This declaration space has a name that is part of a type's name. For instance, the .NET type String is declared in the System namespace. The complete name of the type is System.String. This is called the fully-qualified name of the type. Typically, we use only the unqualified name of the type (String, in this case), because we use using directives to bring declarations into the current scope from a particular namespace.

Namespaces are used for two main purposes:

  • To help organize the code. Typically, types that belong together are declared in the same namespace.
  • To avoid possible name collisions for types. A program may rely on different libraries and it's not unlikely that types with the same name exist in two or more of these...