C# in Depth: Fourth Edition 4th Edition. Jon Skeet.

About the book:
C# in Depth, Fourth Edition is a revised edition of the bestseller written by C# legend Jon Skeet. This authoritative and engaging guide is your key to unlocking this powerful language, including the new features of C# 6 and 7. In it, Jon introduces expression-bodied members, interpolated strings, pattern matching, and more. Real-world examples drive it all home. By the end of this phone book, you'll be writing C# code with skill, style, and confidence.

What's inside:
Comprehensive coverage of C# 6 and 7
Greatest hits of C# 2-5
Extended pass-by-reference functionality
String interpolation
Composition with tuples
Decomposition and pattern matching