Part 1. C# in context

An evolving language

Balancing efficiency and complexity

Ever more concise code

An evolving platform

Part 2. C# 2–5

An evolving book

Generics save the day

Generics

Type constraints

What can be generic

The default and typeof operators

Nullable value types

Language support Part 1

CLR and framework support - The Nullable T struct

Language support Part 2

The importance of being lazy

Iterators

Simplified delegate creation

Minor features

Implementation sketch

Fixed-size buffers

Namespace aliases

Automatically implemented properties

Object and collection initializers

Implicitly typed local variables (var)

Collection initializers

The compiler-generated type

Anonymous types

Lambda expressions

Capturing variables

Expression trees

The end result - LINQ

Query expressions

Dynamic typing

A brief look behind the scenes

Introduction to dynamic typing

Limitations and surprises in dynamic typing

Usage suggestions

Optional parameters and named arguments

Impact on versioning

Dynamic behavior beyond reflection

COM interoperability improvements

Generic variance

Introducing asynchronous functions

Restrictions on using variance

First encounters of the asynchronous kind

Thinking about asynchrony

Async method declarations

Synchronization contexts

Wrapping of return values

Await expressions

The use of awaitable pattern members

Asynchronous anonymous functions

Asynchronous method flow

Method completion

Async main methods in C# 7.1

Allow cancellation wherever possible

Usage tips

Custom task types in C# 7

Structure of the generated code

The MoveNext() method (high level)

The stub method - Preparation and taking the first step

A simple MoveNext() implementation

Capturing variables in foreach loops

How control flow affects MoveNext()

Caller information attributes

Execution contexts and flow

Using caller information attributes with old versions of .NET

Corner cases of caller information attributes

Part 3. C# 6

A brief history of properties

Upgrades to automatically implemented properties

Expression-bodied members

Restrictions on expression-bodied members in C# 6

A recap on string formatting in .NET

Localization

Introducing interpolated string literals

Other uses for FormattableString

Uses, guidelines, and limitations

Localization using FormattableString

Hard limitations of interpolated string literals

Accessing identifiers with nameof

Tricks and traps when using nameof

Object and collection initializer enhancements

Using static directives

Using extension methods in collection initializers

Indexers and the null conditional operator

Exception filters

Part 4. C# 7 and beyond

The null conditional operator

Introduction to tuples

Retrying operations

Tuple types and conversions

Tuple literals and tuple types

Tuples as bags of variables

Conversions from tuple literals to tuple types

Tuples in the CLR

Regular equality and ordering comparisons

Conversions between tuple types

Alternatives to tuples

Uses and recommendations

Deconstruction of tuples

Deconstruction assignments to existing variables and properties

Deconstruction of nontuple types

Introduction to pattern matching

Patterns available in C# 7.0

Using patterns with the is operator

Using patterns with switch statements

Evaluation order of pattern-based switch statements

Thoughts on usage

Recap - What do you know about ref

Ref locals and ref returns

Ref returns

in parameters (C# 7.2)

Overloading with in parameters

Declaring structs as readonly (C# 7.2)

Extension methods with ref or in parameters (C# 7.2)

Ref-like structs (C# 7.2)

Span T and stackalloc

Local methods

Local method implementations

Usage guidelines

Out variables

Improvements to numeric literals

Minor improvements in C# 7.3

Nontrailing named arguments (C# 7.2)

Nullable reference types

Nullable reference types at compile time and execution time

Future improvements

Experiences of nullable reference type migration

Switch expressions

Recursive pattern matching

Indexes and ranges

More async integration

Features not yet in preview

Even more features in brief