EN CSharp Keyword if

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C#: if

Handbook C# · Practical Guide

Executes the block when the logical expression is equal to true.

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 health = 30;
if (health < 50) System.Console.WriteLine("Low");

Result:

Low

Syntax

if (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 health = 35;
        if (health < 50) Console.WriteLine("Heal");
    }
}

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)
    {
        string? name = "Archer";
        if (name is { Length: > 0 }) Console.WriteLine(name.ToUpperInvariant());
    }
}

Official source: Microsoft Learn.