Book Image

Improving your C# Skills

By : Ovais Mehboob Ahmed Khan, John Callaway, Clayton Hunt, Rod Stephens
Book Image

Improving your C# Skills

By: Ovais Mehboob Ahmed Khan, John Callaway, Clayton Hunt, Rod Stephens

Overview of this book

This Learning Path shows you how to create high performing applications and solve programming challenges using a wide range of C# features. You’ll begin by learning how to identify the bottlenecks in writing programs, highlight common performance pitfalls, and apply strategies to detect and resolve these issues early. You'll also study the importance of micro-services architecture for building fast applications and implementing resiliency and security in .NET Core. Then, you'll study the importance of defining and testing boundaries, abstracting away third-party code, and working with different types of test double, such as spies, mocks, and fakes. In addition to describing programming trade-offs, this Learning Path will also help you build a useful toolkit of techniques, including value caching, statistical analysis, and geometric algorithms. This Learning Path includes content from the following Packt products: • C# 7 and .NET Core 2.0 High Performance by Ovais Mehboob Ahmed Khan • Practical Test-Driven Development using C# 7 by John Callaway, Clayton Hunt • The Modern C# Challenge by Rod Stephens
Table of Contents (26 chapters)
Title Page
Copyright and Credits
About Packt
What to Know Before Getting Started
Files and Directories
Advanced C# and .NET Features

.NET Core internals

.NET Core contains two core components—the runtime CoreCLR and the base-class libraries CoreFX. In this section, we will cover the following topics:

  • CoreFX
  • CoreCLR
  • Understanding MSIL, CLI, CTS, and CLS
  • How CLR works
  • From compilation to execution—under the hood
  • Garbage collection
  • .NET Native and JIT compilation


CoreFX is the code name of .NET Core's set of libraries. It contains all the libraries that start with Microsoft.* or System.*and contains collections, I/O, string manipulation, reflection, security, and many more features.

The CoreFX is runtime agnostic, and it can run on any platform regardless of what APIs it supports.


To learn more about each assembly, you can refer to the .NET Core source browser at


CoreCLR provides the common language runtime environment for .NET Core applications, and manages the execution of the complete application life cycle. It performs various operations when the program is running. Operations such as memory...