EN CSharp Keyword false

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C#: false

Handbook C# · Practical Guide

A literal with a false logical value.

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
bool ready = true;
bool stopped = false;
System.Console.WriteLine(ready && !stopped);

Result:

True

Syntax

bool ready = true; bool stopped = false;

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)
    {
        bool ready = true; bool stopped = false;
        Console.WriteLine(ready && !stopped);
    }
}

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)
    {
        bool[] flags = [true, false, true];
        int enabled = flags.Count(value => value == true);
        Console.WriteLine(enabled);
    }
}

Example 3

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)
    {
        Flag value = new(true);
        if (value) Console.WriteLine("Enabled");
    }
}
public readonly record struct Flag(bool Enabled) { public static bool operator true(Flag value) => value.Enabled; public static bool operator false(Flag value) => !value.Enabled; }

Official source: Microsoft Learn.