Command Line Arguments in C#

Command-line arguments are a common way to parameterize execution of programs. For example, dotnet run Program.cs uses run and Program.cs arguments to the dotnet command.

using System;

class Program
{
    static void Main(string[] args)
    {
        // Environment.GetCommandLineArgs() provides access to raw command-line
        // arguments. Note that the first value in this array
        // is the path to the program, and args[1..] holds the
        // arguments to the program.
        string[] argsWithProg = Environment.GetCommandLineArgs();
        string[] argsWithoutProg = args;

        // You can get individual args with normal indexing.
        string arg = args[2];

        Console.WriteLine(string.Join(" ", argsWithProg));
        Console.WriteLine(string.Join(" ", argsWithoutProg));
        Console.WriteLine(arg);
    }
}

To experiment with command-line arguments it’s best to build a binary with dotnet build first.

$ dotnet build
$ dotnet run -- a b c d
/path/to/program.dll a b c d
a b c d
c

Next we’ll look at more advanced command-line processing with flags.

Http Client in C#

Command Line Flags in C#

Learn X By Example

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Command Line Arguments in C#