EN CSharp Keyword checked

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C#: checked

Handbook C# · Practical Guide

Enables overflow checking for integer arithmetic and corresponding conversions in its lexical context.

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 value = int.MaxValue;
try { System.Console.WriteLine(checked(value + 1)); }
catch (System.OverflowException) { System.Console.WriteLine("Overflow"); }

Result:

Overflow

Syntax

checked(expression) / checked { ... }

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 maximum = int.MaxValue;
        try { Console.WriteLine(checked(maximum + 1)); } catch (OverflowException) { Console.WriteLine("Overflow"); }
    }
}

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 maximum = int.MaxValue;
        int wrapped = unchecked(maximum + 1);
        Console.WriteLine(wrapped);
    }
}

Official source: Microsoft Learn.