cs11dotnet7/docs/whats-new.md

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.