C# / .NET Features

The code here goes with my blog posts relate to specific versions of C# and .NET, which are very closely related and usually updated at the same time (see here and here). I sometimes upload code to separate repos (like for WinForms and misc topics), or to Gist or JsFiddle for shorter snippets.

• What's new in C# | Microsoft Learn
• What's new in .NET | Microsoft Learn
• The relationship between C# language features and library types | Microsoft Learn
• Features Added in C# Language Versions · dotnet/csharplang
• C# programming language versions - Wikipedia
• .NET and .NET Core Support Policy

The list below has links to each blog post and the relevant code, separated by version of language/framework. Links with a † next to them are in a separate repo, most likely Surviving WinForms, which applies concepts specifically to the WinForms framework.

C# 13 / .NET 9

• Using CountBy and AggregateBy in LINQ (blog post, source code)

C# 12 / .NET 8

• Primary Constructors in Classes and Structs (blog post, source code)
• Time Abstraction
  • Part 1 - How to use TimeProvider and FakeTimeProvider (blog post, source code)
  • Part 2 - How to use TimeProvider and FakeTimeProvider with timers (blog post, source code)

C# 11 / .NET 7

• Generic Math Support series (source code)
  • Part 1 - What's a static abstract interface method? (blog post)
  • Part 2 - How do I overload arithmetic, equality, and comparison operators? (blog post)
  • Part 3 - What is Generic Math Support? (blog post)
• Generic Attributes (blog post, source code)
• List Patterns (blog post, source code)
• Raw String Literals (blog post, source code)

C# 10 / .NET 6

• MinBy and MaxBy in LINQ (blog post, source code)
• Set-based LINQ - ExceptBy, IntersectBy, UnionBy, DistinctBy (blog post, source code)

C# 9 / .NET 5

• Records, Classes and Equality (blog post, source code)
• Switch/Case Pattern Matching (vs if/else) (blog post, source code)

C# 8 / .NET Core 3.x

• None

C# 7 / .NET 4.7

• Local Functions (aka nested methods) (blog post, source code) †
• Tuples and Deconstruction (blog post, source code) †
• Adding deconstructors to your own (and built-in) types in C# (blog post, source code)

C# 6 / .NET 4.6

• Null-conditional and Null-coalescing operators (blog post, source code) †
• Nameof (blog post, source code) †
• String Interpolation (blog post, source code) †

C# 5 / .NET 4.5

• None

C# 4 / .NET 4

• Named Arguments (blog post, source code) †

C# 3 / .NET 3

• None

C# 2 / .NET 2

• None

C# 1 / .NET 1

• Attributes (blog post, source code)
• Exceptions (throw vs throw ex) (blog post)

General Concepts

• Implicit vs Explicit Conversion (blog post, source code)
• Singleton vs Scoped vs Transient (blog post, source code)