Hey #dotnet community! 👋

C# 12 isn’t just another incremental update—it introduces practical features that streamline how we write and maintain code. As someone who’s been working with C# for years, I’m genuinely excited about how these changes reduce verbosity and boost readability.

My Top 3 Favourite Features

1. Primary Constructors

Finally, a cleaner way to handle constructor boilerplate in classes and structs!

For years, we've written the same repetitive constructor patterns:

public class User
{
    private string _name;
    public User(string name) { _name = name; }
}

C# 12 eliminates this ceremony with primary constructors:

public class User(string name) // Field auto-created!
{
    public string Greet() => $"Hello, {name}!";
}

Why this matters:

Reduces up to 40% of boilerplate in DTOs/entities.

Works with structs **and **record classes too.

2. Collection Expressions

Unified syntax for arrays, lists, and spans.
No more switching between new[], List, and ImmutableArray syntaxes. Now:

int[] array = [1, 2, 3];  
List list = [1, 2, 3];  
Span span = [1, 2, 3];

Bonus: Works with Span for performance-critical scenarios.
Supports spread operator (..) for merging collections:

int[] combined = [..array1, ..array2]; // Like JavaScript, but type-safe!

3. Default Lambda Parameters

Lambdas now support optional parameters (e.g., (int x = 42) => x * 2), making them as flexible as methods.

var multiply = (int x, int y = 2) => x * y;  
multiply(5); // Returns 10

Perfect for:

Configurable event handlers

Math utilities without helper methods

But Wait, There’s More!
*Interceptors *(experimental): A sneak peek into compile-time metaprogramming.

Alias Any Type: using aliases for tuples, arrays, and more.

Should You Upgrade?
Pros:
✅ Immediate productivity boost in new projects.
✅ Minimal breaking changes (unlike C# 11's required modifier).

Cons:
⚠️ Requires .NET 8+ or latest VS 2022.

I wrote a deep dive with code examples and comparisons to C# 11:

🔗 C# 12 Features: The Ultimate Guide

What’s your take?

Which feature will you use first?

Have you hit any **snags **adopting C# 12?

Let’s discuss below! 👇

dotnet #csharp #coding #programming