Book Image

C# 9 and .NET 5 – Modern Cross-Platform Development - Fifth Edition

By : Mark J. Price
Book Image

C# 9 and .NET 5 – Modern Cross-Platform Development - Fifth Edition

By: Mark J. Price

Overview of this book

In C# 9 and .NET 5 – Modern Cross-Platform Development, Fifth Edition, expert teacher Mark J. Price gives you everything you need to start programming C# applications. This latest edition uses the popular Visual Studio Code editor to work across all major operating systems. It is fully updated and expanded with a new chapter on the Microsoft Blazor framework. The book’s first part teaches the fundamentals of C#, including object-oriented programming and new C# 9 features such as top-level programs, target-typed new object instantiation, and immutable types using the record keyword. Part 2 covers the .NET APIs, for performing tasks like managing and querying data, monitoring and improving performance, and working with the file system, async streams, serialization, and encryption. Part 3 provides examples of cross-platform apps you can build and deploy, such as websites and services using ASP.NET Core or mobile apps using Xamarin.Forms. The best type of application for learning the C# language constructs and many of the .NET libraries is one that does not distract with unnecessary application code. For that reason, the C# and .NET topics covered in Chapters 1 to 13 feature console applications. In Chapters 14 to 20, having mastered the basics of the language and libraries, you will build practical applications using ASP.NET Core, Model-View-Controller (MVC), and Blazor. By the end of the book, you will have acquired the understanding and skills you need to use C# 9 and .NET 5 to create websites, services, and mobile apps.
Table of Contents (23 chapters)

Managing memory with reference and value types

There are two categories of memory: stack memory and heap memory. With modern operating systems, the stack and heap can be anywhere in physical or virtual memory.

Stack memory is faster to work with (because it is managed directly by the CPU and because it uses a last-in, first-out mechanism, it is more likely to have the data in its L1 or L2 cache) but limited in size, while heap memory is slower but much more plentiful.

For example, on my macOS, in TERMINAL, I can enter the command ulimit -a to discover that stack size is limited to 8,192 KB and other memory is "unlimited." This is why it is so easy to get a "stack overflow."

There are two C# keywords that you can use to create object types: class and struct. Both can have the same members, such as fields and methods. One difference between the two is how memory is allocated.

When you define a type using class, you are defining a reference type....