Latest features introduced in C# 8.0 Follow .NET related update: https://www.facebook.com/bd.netdev/

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

8. Switch expressions

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]

16. Asynchronous streams

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