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)

Exception handling

There are scenarios where our code produces an error. The error might occur because of a logical issue in the code, such as trying to divide by zero or access an element in an array beyond the bounds of the array. For example, trying to access the fourth element in an array of size three. Errors can also occur because of external factors, such as trying to read a file that does not exist on a disk.

C# provides us with a built-in exception-handling mechanism to handle these types of errors at the code level. The syntax for exception handling is as follows:

try
{
    Statement1;
    Statement2;
} 
catch (type)
{
    // code for error handling
}
finally
{
    // code to always run at the end
}

The try block can contain one or more statements. The catch block contains the error handling code. The finally block contains the code that will execute after the try section. This happens...