Static Lambda in C# 12 : Performance Improvement

A Static lambda, introduced in C# 12, is a lambda expression that cannot capture any variables from its enclosing scope. This means no closure class is generated, resulting in less memory allocation and potentially better performance.

Let’s work with some examples.

1. Sorting Collections:

Sorting a list of integers using a static lambda ensures no closures are created, reducing overhead during sorting

var numbers = new List<int> { 53, 31, 8, 1, 2,100,34,55,11,1 };
numbers.Sort(static (a, b) => a.CompareTo(b));
foreach (var item in numbers)
{
    Console.WriteLine(item);
}
Console.ReadKey();

Result

2. Array Filtering
Filtering an array with a static lambda avoids capturing variables, making the filtering operation more efficient.

Console.WriteLine("--------Array Filtering-----------");
var array = new[] { 1, 2, 3, 4, 5 };
var filtered = Array.FindAll(array, static n => n > 3);
foreach (var item in filtered)
{
    Console.WriteLine(item);
}

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