C# Beginner

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I am learning to write C# programs and started off with msdn C# tutorials. I am already stuck :) with a problem with my first program (Hello World).

C#

// Hello3.cs
// arguments: A B C D
using System;

public class Hello3
{
   public static void Main(string[] args)
   {
      Console.WriteLine("Hello, World!");
      Console.WriteLine("You entered the following {0} command line arguments:",
         args.Length );
      for (int i=0; i < args.Length; i++)
      {
         Console.WriteLine("{0}", args[i]);
      }
   }
}

When I execute the above code, I expect a console window to open up for me to type in arguments, but it executes and the window dissapears even before I can see what is there in it. I have no idea what to do??????

I inserted the "Console.ReadKey()", but still the window doesnt stay on execution, it dissapears???

Posted 18-Apr-10 7:30am

jbjoat

Updated 18-Apr-10 7:42am

v2

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4 solutions

Solution 3

Well, arguments are not entered in the Command Prompt that opens up rather they are passed while calling your exe from command line or Run dialog.

If you want to pass command line arguments from Visual Studio itself (usually done for testing command line utilities) then follow the following steps:
1. Open Properties for your solution.
2. Select Debug tab.
3. In Start Options, provide the arguments that you want to pass.

It would work perfectly after that.

Posted 18-Apr-10 10:06am

The Manoj Kumar

Solution 4

Just to add to what the others have said, it is worth adding a prompt so that you know when it has finished:

C#

public static void Main(string[] args)
{
   Console.WriteLine("Hello, World!");
   Console.WriteLine("You entered the following {0} command line arguments:",
      args.Length );
   for (int i=0; i < args.Length; i++)
   {
      Console.WriteLine("{0}", args[i]);
   }
   Console.Write("[End: Press any key to exit]");
   Console.ReadKey();
}

It is always a good idea to let your user (even if it is only you) know you are waiting for him to do something! Other than that, not a bad effort for a first program at all. :-D

Posted 18-Apr-10 10:19am

OriginalGriff

Solution 2

jbjoat wrote:
I inserted the "Console.ReadKey()", but still the window doesnt stay on execution, it dissapears???

I'm guessing you've placed the line in the for loop. Place it outside the loop, like so:

C#

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

Posted 18-Apr-10 9:04am

Kristian Sixhøj

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Eddy Vluggen · Accepted Answer · 2010-04-18T07:34:00

The proces executes, displays the results, and cleans up. The easy way out is to wait for a keypress;

C#

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

--edit;
As an alternative, you can run your code outside the debugger; if you hit Ctrl-F5, the app should be launched and it would ask to press any key before it exits.

Good luck :)