EN CSharp Keyword while

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C#: while

Handbook C# · Practical Guide

Tests the condition before each iteration, so the body may execute zero times.

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
int count = 0;
while (count < 2) System.Console.WriteLine(count++);

Result:

0
1

Syntax

while (condition) { ... }

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)
    {
        int count = 0;
        while (count < 3) { Console.WriteLine(count); count++; }
    }
}

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)
    {
        Queue<string> queue = new(["A", "B"]);
        while (queue.TryDequeue(out string? value)) Console.WriteLine(value);
    }
}

Official source: Microsoft Learn.