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)

LINQ

LINQ is a set of technologies that enable developers to query a multitude of data sources in a consistent manner. Typically, you would use different languages and technologies to query different types of data, such as SQL for relational databases, and XPath for XML. SQL queries are written as strings, which makes them impossible to verify at compile time and increase the chances of having runtime errors.

LINQ defines a set of operators and a built-in language syntax for querying data. LINQ queries are strongly typed and therefore verified at compile time. LINQ also provides a framework for building your own LINQ providers, which are components that transform a query into APIs that are specific to a particular data source. The framework provides built-in support for querying objects (anything that is a collection in .NET), relational databases, and XML. Third parties have written LINQ providers for many data sources, such as web services.

LINQ enables developers to focus...