EN CSharp Keyword const

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C#: const

Handbook C# · Practical Guide

Declares a value known at compile time; after the announcement, it is not changed.

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
const int Limit = 3;
System.Console.WriteLine(Limit);

Result:

3

Syntax

const int Limit = 5;

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)
    {
        const int Limit = 3;
        for (int i = 0; i < Limit; i++) Console.WriteLine(i);
    }
}

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)
    {
        Console.WriteLine(Defaults.Prefix + Defaults.Maximum);
    }
}
public static class Defaults { public const string Prefix = "Limit="; public const int Maximum = 10; }

Official source: Microsoft Learn.