EN CSharp Keyword static

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C#: static

Handbook C# · Practical Guide

Binds a member to a type instead of an instance. static class contains only static members; static lambda does not capture local variables.

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.Console.WriteLine(Tools.Double(4));
static class Tools { public static int Double(int x) => x * 2; }

Result:

8

Syntax

static class Tools { public static int Value { get; } }

Example 1: simple form

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)
    {
        Console.WriteLine(Tools.Double(6));
    }
}
public static class Tools { public static int Double(int value) => value * 2; }

Example 2: another practical form

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[] values = [1, 2, 3];
        Console.WriteLine(values.Select(static value => value * value).Sum());
    }
}

Official source: Microsoft Learn.