EN CSharp Operator Member Access

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Members, calling and indexing

Handbook C# · Practical Guide

A dot selects a member, () calls a callable, [] reads an element or an indexer. ?. and ?[] terminate access at null.

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
string? name = null;
System.Console.WriteLine(name?.Length ?? 0);

Result:

0

Syntax

value.Member / method(args) / items[index] / value?.Member

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)
    {
        string text = "ore";
        Console.WriteLine(text.ToUpperInvariant());
        Console.WriteLine(text[1]);
    }
}

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[]? names = null;
        Console.WriteLine(names?[0] ?? "Missing");
        string? text = "wood";
        Console.WriteLine(text?.Length);
    }
}

Official source: Microsoft Learn.