How to access command line arguments in .csx script?

Question

I'm using csi.exe the C# Interactive Compiler to run a .csx script. How can I access any command line arguments supplied to my script?

csi script.csx 2000

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If you're not familiar with csi.exe, here's the usage message:

>csi /?
Microsoft (R) Visual C# Interactive Compiler version 1.3.1.60616
Copyright (C) Microsoft Corporation. All rights reserved.

Usage: csi [option] ... [script-file.csx] [script-argument] ...

Executes script-file.csx if specified, otherwise launches an interactive REPL (Read Eval Print Loop).

Answer 1

CSI has an Args global which parses out the arguments for you. For most cases, this will get you the arguments you wanted as if you were accessing argv in a C/C++ program or args in the C# Main() signature static void Main(string[] args).

Args has a type of IList<string> rather than string[]. So you will use .Count to find the number of arguments instead of .Length.

Here is some example usage:

#!/usr/bin/env csi
Console.WriteLine($"There are {Args.Count} args: {string.Join(", ", Args.Select(arg => $"“{arg}”"))}");

And some example invocations:

ohnob@DESKTOP-RC0QNSG MSYS ~/AppData/Local/Temp
$ ./blah.csx
There are 0 args:

ohnob@DESKTOP-RC0QNSG MSYS ~/AppData/Local/Temp
$ ./blah.csx hi, these are args.
There are 4 args: “hi,”, “these”, “are”, “args.”

ohnob@DESKTOP-RC0QNSG MSYS ~/AppData/Local/Temp
$ ./blah.csx 'hi, this is one arg.'
There are 1 args: “hi, this is one arg.”