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What's New in the 7th Edition

There are hundreds of minor fixes and improvements throughout the 7th edition; too many to list individually. All errata and improvements listed here have been made to the 7th edition.

The main new sections in C# 11 and .NET 7, 7th edition compared to C# 10 and .NET 6 6th edition are shown below.

Chapter 1

  • Understanding .NET support: explains that Current support is now renamed Standard Term Support (STS).

Chapter 2

  • Raw string literals and Raw interpolated string literals: new C# 11 features.

Chapter 3

  • Storing multiple values in an array: not a new feature but previous editions didn't really cover arrays.
  • List pattern matching with arrays: a new C# 11 feature.

Chapter 4

  • Understanding top-level programs and functions: I explain in detail how top-level programs work with separate files for partial Program class since I use that technique throughout the book.
  • Most of the function examples have been improved based on reader feedback, for example, going beyond supported ranges to see when exceptions and overflows occur.
  • A brief aside about the correct usage of the terms arguments and parameters.
  • Hot reloading during development.
  • Logging information about your source code.

Chapter 5

  • Avoiding a namespace conflict with a using alias, and Renaming a type with a using alias. Not new but useful for readers to know.
  • Requiring properties to be set during instantiation: the new C# 11 required keyword.

Chapter 6

  • Checking for null in method parameters: explains the story behind !! in C# 11.
  • Treating warnings as errors: added for good practice.
  • Understanding warning waves.

Chapter 7

  • Viewing source links with Visual Studio 2022: explain differences between viewing source links and decompiling, with Enumerable.Count method as an example which then helps to understand later why Count() can be inefficient.

Chapter 8

  • Activating regular expression syntax coloring: the new [StringSyntax] attribute introduced in .NET 7.
  • Improving regular expression performance with source generators.

Chapter 9

  • Working with Tar archives. New in .NET 7.

Chapter 10

  • Customizing the reverse engineering templates: I just mention that this is possible because it's interesting but too advanced for this book.
  • More efficient updates and deletes. Uses new methods in EF Core 7.

Chapter 11

  • Sorting by the item itself. Uses new methods in .NET 7.
  • Be careful with Count! A section about the Count() method implementation and how it can be tricky to work with efficiently.
  • Paging with LINQ. A new section for the book but not a new LINQ feature. Just helpful to cover before getting into web development.

Chapter 13

  • Enabling request decompression support.
  • Enabling HTTP/3 support.

Chapter 14

  • Using output caching. Output caching was added in ASP.NET Core 7.

Chapter 15

  • Support for logging additional request headers in W3CLogger.
  • Enabling HTTP/3 support for HttpClient.

Chapter 16

  • Enabling location change event handling.