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C#: args

Handbook C# · Practical Guide

Implicit string[] parameter of the top-level program. In a regular Main, such a parameter name is a convention, not a required word.

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
System.Console.WriteLine(args.Length == 0 ? "No arguments" : args[0]);

Result:

No arguments

Syntax

string[] args / top-level args

Example 1: simple form

using System; Console.WriteLine(args.Length > 0 ? args[0] : "No arguments");

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)
    {
        for (int i = 0; i < args.Length; i++) Console.WriteLine($"{i}:{args[i]}");
    }
}

Official source: Microsoft Learn.