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  1. #1
    Join Date
    Nov 2011

    Book for command-line application

    Are there any books about C sharp that only considers command-line applications?
    I am new to OOP and I only want to learn the concepts to do some command-line
    app for my school assignment. thanks

  2. #2
    Join Date
    Feb 2011
    United States

    Re: Book for command-line application

    No need for a book. The internet is your best resource. This is a good introduction to the language: http://www.csharp-station.com/tutorial.aspx

    There's not much special for command line applications. Arguments passed on the command line (seperated by spaces) get put into the args argument of main(string[] args). You can figure out how many arguments by calling args.Length. Loop over them like:
    for(int i = 0; i < args.Length; i++)
        Console.WriteLine(args[i]); //Print the args to output... or whatever you want to do with them
    You can read from the console like:

    string someData = Console.ReadLine(); //User enters information until they push enter, in which case the string gets stored in the newly-declared someData variable.
    You can write to the console like:

    Console.Write("Blah"); //Write blah to the console, without a new line
    Console.WriteLine("Blah"); //Write blah to the console, then add a new line
    Console.WriteLine("{0} is {1}", "programming", "fun"); //Write "programming is fun" to the console, then add a new line
    File IO can be done (for many files) most efficiently like (make sure you have the System.IO using directive):

    string pathToYourFile = @"C:\mydata.txt";
    string[] fileLines = File.ReadAllLines(pathToYourFile);
    //Then you can loop over the lines of your file
    You can write messages to standard error (instead of standard output) like:

    Console.Error.WriteLine("Error: You didn't get me any arguments!");
    You can have your application exit with an error code:


    //Check right number of arguments passed
    if( args.Length != 2 )
        Console.Error.WriteLine("Error: Wrong number of arguments");
        Console.Error.WriteLine("Usage: Program.exe [First arg description] [Second arg description]");
    Anyway, hopefully that main link and some of these idioms will help you.
    Best Regards,

    All advice is offered in good faith only. You are ultimately responsible for effects of your programs and the integrity of the machines they run on.

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