Albahari J. C# 9.0 Pocket Reference. Instant Help...2021

Textbook in PDF format

When you need answers about using C# 9.0, this tightly focused and practical book tells you exactly what you need to know without long intros or bloated samples. Succinct and easy to browse, this reference is an ideal quick source of information and can be used as a guide to get you rapidly up to speed if you know Java, C++, or an earlier C# version.
All programs and code snippets are available as interactive samples in LINQPad. You can edit these samples and instantly see the results without needing to set up projects in Visual Studio. Written by the authors of C# 9.0 in a Nutshell, this pocket reference covers:
C# fundamentals and features new to C# 9.0
Advanced topics like operator overloading, type constraints, nullable types, operator lifting, closures, patterns, and asynchronous functions
LINQ: sequences, lazy execution, standard query operators, and query expressions
Unsafe code and pointers, custom attributes, preprocessor directives, and XML documentation