Deep Dive C# 8.0
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The document provides an overview of C# 8.0 features, including version history, development environment requirements, and new capabilities like default interface methods and switch expressions. It details enhancements such as using declarations, null-coalescing assignments, and asynchronous streams. Additionally, it discusses nullable reference types and type declarations in the context of C#'s strong typing.
![Indices and ranges
• array[2]
• array[array.length-2]
• List().GetRange(2,3)
• The last word is {words[^1]}
• words[1..4]
• Start from end words[^2..^0]](https://image.slidesharecdn.com/azuredevfestdhaka2019-191201135019/85/Deep-Dive-C-8-0-15-320.jpg)
Deep Dive C# 8.0
- 1. Deep Dive C# 8.0 Sabah Shariq | Microsoft MVP
- 2. C# Version History and Features Version .NET Framework Visual Studio C# 1.0 .NET Framework 1.0/1.1 Visual Studio .NET 2002 C# 2.0 .NET Framework 2.0 Visual Studio 2005 C# 3.0 .NET Framework 3.0/3.5 Visual Studio 2008 C# 4.0 .NET Framework 4.0 Visual Studio 2010 C# 5.0 .NET Framework 4.5 Visual Studio 2012/2013 C# 6.0 .NET Framework 4.6 Visual Studio 2013/2015 C# 7.0 .NET Core Visual Studio 2017 C# 8.0 .NET Core Visual Studio 2019
- 3. C# 8.0 Development Environment 1 .NET Core 3.0 2 Visual Studio 2019 (version 16.3)
- 4. Readonly Struct • C# 7.X Struct set as readonly • C# 8.0 Struct member set as readonly C#7.X C#8.0
- 5. Default interface methods We know about Interfaces: 1 Only contains declarations of methods, properties, indexers, and events 2 Interface cannot include private, protected, or internal members 3 Interface cannot contain fields 4 By default, all the members are public. C# will give a compile-time error if used ‘public’ keyword explicitly.
- 6. Default interface methods (cont.)
- 7. Default interface methods (cont.) In C# 8.0 we can do following: 💡.NET Core 3.0 and C# 8.0
- 9. Switch expressions (cont.) => In C# 8.0
- 10. Switch expressions (cont.) => • Variable comes before the switch keyword • The case and : elements are replaced with => • default case is replaced with a _ discard • bodies are expressions, not statements
- 11. Using declarations C# 8.0 introduces Using declarations where we had Using statement
- 12. Static Local Function Classic approach of single usage/call function:
- 13. Static Local Function (cont.) Modern approach in C# 7.X In C# 8.0
- 14. Null-coalescing assignment Old way C#7.X: Null-coalescing C#7.X: Null-coalescing assignment
- 15. Indices and ranges • array[2] • array[array.length-2] • List().GetRange(2,3) • The last word is {words[^1]} • words[1..4] • Start from end words[^2..^0]
- 17. Nullable reference types • C# is a strongly-typed language • Declare the type of a variable • Value type: integer, float, decimal, text, etc. • Reference type: string, class, interface, object
- 18. Thank You
Editor's Notes
- #3: Word cloud image source: Filip Ekberg blog.