EN CSharp Operator Index Range

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End indices and ranges

Handbook C# · Practical Guide

^1 denotes the last element. The range excludes the right border; .. unbounded means the entire supported object.

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[] values = [10, 20, 30];
System.Console.WriteLine(values[^1]);
System.Console.WriteLine(string.Join(",", values[..2]));

Result:

30
10,20

Syntax

items[^1] / items[start..end]

Example 1

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[] values = [10, 20, 30, 40];
        Console.WriteLine(values[^1]);
        Console.WriteLine(string.Join(",", values[1..3]));
    }
}

Example 2

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";
        Console.WriteLine(name[..3]);
        Console.WriteLine(name[^2..]);
    }
}

Official source: Microsoft Learn.