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)

Unsafe code

When we discuss the types of .NET Framework and C# language support, we refer to value types (structures) and reference types (classes). However, there is yet another type that is supported, and that is pointer types. If you are not familiar with the C or C++ programming languages and pointers in particular, then you should know pointers are like references—they are storage locations that contain the addresses of objects. A reference is basically a safe pointer that is managed by the CLR.

To work with pointer types, you must establish a so-called unsafe context. In CLR terms, this is called unverifiable code because the CLR cannot verify its safety. Unsafe code is not necessarily dangerous, but it's your entire responsibility to ensure that you do not introduce pointer errors or security risks.

In truth, there are very rare cases where you actually have to work with pointers in unsafe contexts in C#. There are two common scenarios when this could be the...