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c#command-line-arguments
Kamlesh Sharma
Kamlesh Sharma

Reputation: 25

C# "Command-Line arguments exception"

How can I store a string command line argument in to a self defined string variable. As it tend to give "Array Index out of Range Bounds"...

Here is the code,

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Prac1_e
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Enter a String and a number : ");
            Console.Read();
            string str = args[0];
            int n = Convert.ToInt32(args[1]);
            Console.WriteLine(str);
            Console.WriteLine(n);
            Console.ReadKey();
        }
    }
}

Upvotes: 1

Views: 1968

Answers (4)

praty
praty

Reputation: 573

If you intend to read arguments passed in run-time from command line, you would need to read from Console object. You can try this code.

static void Main(string[] args)
    {
        Console.WriteLine("Enter a String and a number : ");

        string str = Console.ReadLine();
        int n = Convert.ToInt32(Console.ReadLine());
        Console.WriteLine(str);
        Console.WriteLine(n);
        Console.ReadKey();
    }

Upvotes: 0

Mureinik
Mureinik

Reputation: 311316

You are attempting to access the first two command line argument (agrs[0] and args[1]), but aren't passing any. Just pass some arguments and you should be fine:

Program somearg anotherarg

Upvotes: 1

jordanhill123
jordanhill123

Reputation: 4182

Arguments need to be passed via the command line in the format appname.exe "arg1" "arg2" etc. Also, since you are converting to an Int, you may want to validate that arg[1] is convertible to an Int. 

    static void Main(string[] args)
    {
        Console.WriteLine("Enter a String and a number : ");
        Console.Read();
        if(args.Length >= 2)
        {
            string str = args[0];
            int n = Convert.ToInt32(args[1]);
            Console.WriteLine(str);
            Console.WriteLine(n);
            Console.ReadKey();
        }
        else
        {
            Console.WriteLine("No Args passed");
        }
    }

If you are looking to capture runtime parameters via command-line, you would need to do something like the following:

    static void Main(string[] args)
    {
        Console.WriteLine("Enter a String and a number, with a space between: ");
        string consoleRead = Console.ReadLine();
        string[] parsed = consoleRead.Split(' ');
        if (parsed.Length > 1)
        {
            string str = parsed[0];
            int n = Convert.ToInt32(parsed [1]);
            Console.WriteLine(str);
            Console.WriteLine(n);
            Console.ReadKey();
        }
    }

Upvotes: 0

Hiran
Hiran

Reputation: 1180

No error in this code. But you will get above error, when you execute the program incorrectly. this should be the correct way:

[program name] [argument 1] [argument 2]

ex:

testprogram arg1 5

Upvotes: 0

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