creating a file

  • Thread starter Thread starter sahel
  • Start date Start date
S

sahel

Hi all;
I wrote a program that it must create a file & it doesn’t has error
but at its runtime it has this error

Unhandled exception :system. Index out of range exception :index was
outside the bounds of the array

using System;
using System.IO;
namespace ConsoleApplication85
{
class Program
{
static void Main(string[] args)
{
StreamWriter myfile = File.CreateText(args[0]);
myfile.WriteLine("*********");
myfile.Close();
Console.WriteLine("****");


}
}
}
 
static void Main(string[] args)
{
StreamWriter myfile = File.CreateText(args[0]);
Click to expand...

Enter the debugger and take a look at args. Are you passing an argument to
the program?
 
static void Main(string[] args)
        {
             StreamWriter myfile = File.CreateText(args[0]);
Click to expand...

Enter the debugger and take a look at args. Are you passing an argument to  
the program?
Click to expand...

:o
i don't know how to do that & i dont know anything a bout args ( i am
new at c# ) [ :-( ]
 
Hi all;
I wrote a program that it must create a file & it doesn’t has error
but at its runtime it has this error

Unhandled exception :system. Index out of range exception :index was
outside the bounds of the array

using System;
using System.IO;
namespace ConsoleApplication85
{
class Program
{
static void Main(string[] args)
{
StreamWriter myfile = File.CreateText(args[0]);
myfile.WriteLine("*********");
myfile.Close();
Console.WriteLine("****");


}
}
}


Because the array is empty. Right-click on your app in solution explorer and
select Debug then
enter any command line arguments you want to test. When you run the App from
the shell
the array will contain whatever you typed in there.

mick
 
Hi all;
I wrote a program that it must create a file& it doesn’t has error
but at its runtime it has this error

Unhandled exception :system. Index out of range exception :index was
outside the bounds of the array

using System;
using System.IO;
namespace ConsoleApplication85
{
class Program
{
static void Main(string[] args)
{
StreamWriter myfile = File.CreateText(args[0]);
myfile.WriteLine("*********");
myfile.Close();
Console.WriteLine("****");


}
}
}
Click to expand...

Did you pass a command line argument? You should have run something like:

ConsoleApplication85 SomeFile.txt

You would get the error if not including the SomeFile.txt part.
 
sahel said:
static void Main(string[] args)
{
StreamWriter myfile = File.CreateText(args[0]);
Click to expand...
Enter the debugger and take a look at args. Are you passing an argument to
the program?
Click to expand...

:o
i don't know how to do that & i dont know anything a bout args ( i am
new at c# ) [ :-( ]
Click to expand...

If you don't know what arguments are, how did it occur to you to write
"args[0]" and to expect that args[0] would contain the path of a file?

When you call an application myapp.exe at the command line as follows

C:\>myapp filepath

whatever you have in place of filepath is the first (and, in this case,
only) argument, and would be contained in arg[0]. If you are running
your app in Visual Studio, you can set the arguments to be used during
testing in the project's properties.
 
Hi Sahel!

you already got 2 good answers. I just want to add, that you should always
(!!) check the input first. You can never trust, what your public methods
get from outside.

In your case, you should check first, if args has an element.

Of course: You should simply grab some book and learn the basics but in my
eyes it is important to do these checks directly from the beginning.

Konrad
 
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