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DevelopmentProgramming LanguagesC#

What's New in C#7, C#8, C#9 and C#10

Learn about latest features of C#7, C#8, C#9 and C#10
Rating: 4.5 out of 54.5 (897 ratings)
9,193 students
Created by Dmitri Nesteruk
Last updated 11/2021
English
English [Auto]

What you'll learn

  • Understand and appreciate C#7, C#8 and C#9 language features
  • Learn how to use new language features in practice

Requirements

  • Knowledge of C# 6 and earlier

Description

This short course covers the latest and greatest features of C#, covering versions 7, 7.1, 7.2, 7.3, 8.0, 9.0 and 10.0 of the language that are being sim-shipped with corresponding Visual Studio updates.

Course Topics

Here's every language feature presented in this course, grouped by the version of the C# language.

C# 7:

  • Out Variables

  • Pattern Matching (is and switch expressions)

  • Tuples and Tuple Deconstruction

  • Local Functions

  • Ref Returns and Locals

  • Expression Bodied Members

  • Throw Expressions

  • Generalized Async Return Types

  • Literal Improvements

C# 7.1:

  • How to turn on C# 7.1 support

  • Async Main

  • Default Expressions

  • Ref Assemblies

  • Infer Tuple Names

  • Pattern-Matching with Generics

C# 7.2:

  • Leading Digit Separators

  • 'Private Protected' Access Modifier

  • Non-Trailing Named Arguments

  • Reference Semantics on Value Types:

    • 'In' Parameters

    • 'Ref Readonly' Variables

    • 'Ref Struct' and Span<T>

C# 7.3:

  • Performance improvements

    • Access fixed fields without pinning

    • Reassign ref local variables

    • Use initializers on stackalloc arrays 

    • Use fixed statements on any type that supports a pattern 

  • Enhancements to existing features 

    • Tuple == and != support 

    • Use expression variables in more locations 

    • Attach attributes to backing field of auto-properties 

    • Improved method resolution when arguments differ by 'in' 

    • Improved overload resolution 

  • New compiler options: 

    • deterministic

    • publicsign

    • pathmap

C# 8:

  • Nullable Reference Types

  • Indices and Ranges

  • Default Interface Members

  • Pattern Matching

C# 9:

  • Record Types

  • Top-Level Calls

  • Initial Setters

  • Pattern Matching Improvements (type patterns, parenthesized patterns, conjunctive and, disjunctive or, negated not, relational patterns)

  • Performance and Interop (Native sized integers (nint/nuint), function pointers, SkipLocalsInit)

  • Fit and Finish (target-typed new, target type resolution of conditional expressions, static modifier for lambda expressions and anonymous methods, covariant return types, foreach GetEnumerator() use, discards as parameters to lambdas, attributes on local functions)

  • C# Code Generators (partial method syntax, module initializers)

C# 10:

  • Record Structs

  • Global Using Directives

  • File-Scoped Namespace Declarations

  • Extended Property Patterns

  • Generic Attributes

  • Lambda Improvements (attributes, explicit return types, natural type inference)

  • Enhanced #line directives

Prerequisites

  • Knowledge and understanding of C# 6 and earlier

  • General experience in .NET/C# application development

Learning Outcomes

  • An understanding and appreciation of latest C# 7/7.1/7.2/7.3/8/9 language features

  • Understanding of how to convert existing C# code to C# 7/7.1/7.2/7.3/8/9

Who this course is for:

  • Beginner and experienced .NET/C# developers

Instructor

Dmitri Nesteruk
Software/Hardware Engineering • Quant Finance • Algotrading
Dmitri Nesteruk
  • 4.5 Instructor Rating
  • 38,469 Reviews
  • 206,883 Students
  • 22 Courses

Dmitri is a quant, developer, book author and course author. His interests lie in software development and integration practices in the areas of computation, quantitative finance and algorithmic trading. His technological interests include C# and C++ programming as well high-performance computing using technologies such as CUDA and FPGAs. He has been a C# MVP since 2009. 

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