Static Lambda in C# 12 : Performance Improvement

Devesh Omar
Jan 02
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Article

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

Sorting Collection

2. Array Filtering

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

Code

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);
}

Result

Array Filtering

3. Parallel Processing

No closures are created, improving the efficiency of task creation and execution.

Code

Console.WriteLine("-----------Parallel Processing------");
var tasks = Enumerable.Range(0, 10).Select(static i =>
                           Task.Run(() => Helper. DoWork(i))).ToArray();
Task.WaitAll(tasks);

//helper  class
 public  class Helper
 {
     public static void DoWork(int i)
     {
         Console.WriteLine($"Processing value is  {i}");
     }
 }

Result

Parallel Processing

4. Array.ForEach

Code

Console.WriteLine("-------------Array.ForEach-----------------------");
var array = new[] { 11, 22, 33, 4, 5,99,55,2 };

Array.ForEach(array, static n => Console.WriteLine(n));

Result

Array.ForEach

Thanks.

Keep learning!