Very Basic Question - Just Learning

Question

I am running the below code that I have built on from the Hello World! application.  I have been able to compile it and run it from command prompt and from within Visual Studio for debugging.  the strange thing is that even if I do not put any args after the command line it still does not process the if statement.  I added the "Console.WriteLine(args.Length);" line in there so I could prove to myself that it was in fact null but the program keeps skipping over the iff statement.  Also, if I do put an arg after the command line it processes the code "Hello, System.String[]!"...  I know this is very basic so thanks for the help!

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


namespace HelloWorldVS
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine(args.Length);
            if (args == null)
            {
                Console.WriteLine("Hello, World!");
                Console.ReadLine();
            }
            else
            {
                Console.Write("Hello, ");
                Console.Write(args);
                Console.WriteLine("!");
            }
            Console.ReadLine();
        }
    }
}

Answer 1

args will never be null, it will just be an array of 0 strings.  I have corrected the code below.  Additionally, you didn't need the Console.ReadLine(); when there are no arguments, so I commented it out.  Also, I didn't think that when you were printing your arguments that it was giving you quite what you expected, so I corrected that as well.

Hope this helps.

  static void Main(string[] args)
  {
   //Console.WriteLine(args.Length);
   if (args.Length == 0)
   {
    Console.WriteLine("Hello, World!");
    //Console.ReadLine();
   }
   else
   {
    Console.Write("Hello, ");
    foreach (string arg in args)
    {
     Console.Write(arg + " ");
    }
    Console.WriteLine("!");
   }
   Console.ReadLine();
  }

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Answer 2

Try:

if(args.Length ==0)

Args array is not null it is just empty.

Regards

Jack Lichwa

---

Jack Ernest Care About Your Craft

Answer 3

Ah, OK, I figured it was something that had to deal with the args not being empty.  Thanks!

Answer 4

Thanks!