EN CSharp Operator Lambda

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Lambda expressions and body expressions

Handbook C# · Practical Guide

=> introduces an expression lambda or the body of an expression-bodied member. Parameter and result types can be inferred from the context when appropriate.

Simple example (Example.cs)

Save this example separately as Example.cs. Run it independently of the other examples on this page.

Example.cs:

// PROJECT-EXAMPLE
System.Func<int, int> twice = value => value * 2;
System.Console.WriteLine(twice(4));

Result:

8

Syntax

value => expression / (left, right) => { ... }

Example 1

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using System.IO;
using System.Runtime.InteropServices;
using System.Runtime.CompilerServices;

public static class Program
{
    public static async Task Main(string[] args)
    {
        Func<int, int> square = value => value * value;
        Console.WriteLine(square(4));
    }
}

Example 2

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using System.IO;
using System.Runtime.InteropServices;
using System.Runtime.CompilerServices;

public static class Program
{
    public static async Task Main(string[] args)
    {
        int offset = 3;
        Func<int, int> adjusted = value => { int result = value + offset; return result; };
        Console.WriteLine(adjusted(5));
    }
}

Official source: Microsoft Learn.