Thread: [C#] How to use This Array

  1. #1
    The Programming Dutchman
    Join Date
    Jan 2008

    [C#] How to use This Array

    at first is maybe practical to say that i am dutch, and so my english could be a little bit bad. :P

    Hello everybody,

    today i started to write a contact management application. and I use C# with the combination of XML(system.Xml) to make it work. at this moment i have a little problem with a array. the problem is that i dont know how to use the array in my script;

    this is the array:

    string [] Contactinfo;
                Contactinfo = new string[5] {"Name", "Lastname", "City", "Postcode"};
    As you can see i declared the 4 arrays and give all of them a special name, the 1st Name, 2nd Lastname ect ect.

    but if i use this array like this(see code below). it turns out into a build error:

    Error 1 Cannot implicitly convert type 'string' to 'int'

    xmltextwriter.WriteElementString("naam", Contactinfo["Name"]);
    this sounds strange to me because the array is a string and i didnt gave the array a value yet.(is it maybe possible, cause the array doesn't have a value yet so it returns in 0, so it's a int?)

    Thank you for your attention.


    PS: does somebody knows a good beginner tutorial of C# and XML?
    Last edited by Jelte; 08-11-2008 at 10:53 AM.

  2. #2
    Confused Magos's Avatar
    Join Date
    Sep 2001
    The strings you specified are the values of the array ("Name", "Lastname", etc...). To index each element you use zero-based integers (0, 1, 2, etc...).

    If you still want to index by a string you could use a dictionary, to map string -> string.
    var ContactInfo = new System.Collections.Generic.Dictionary<string, string>();
    ContactInfo["Name"] = "John";
    ContactInfo["Lastname"] = "Smith";
    Depending on what you're trying to achieve it may be better to store the data in a struct or class:
    class ContactInfo
      public string Name;
      public string Lastname;
    var MyInfo = new ContactInfo();
    MyInfo.Name = "John";
    MyInfo.LastName = "Smith";
    (in the above sample it's usually better to make a constructor that takes arguments, but that's another story)

    Give a man a fish and you feed him for a day.
    Teach a man to fish and you feed him for a lifetime.

  3. #3
    The Programming Dutchman
    Join Date
    Jan 2008
    @Magos thanks for your reply, i knew that the original method of indexing is the zero-based, but i though i saw on some site that you can use: (see code below) to replace the numbers in this words.

    Contactinfo = new string[5] {"Name", "Lastname", "City", "Postcode"};
    And Thanks so add the Code-Snippets in your message but i'am not yet that skilled that i can handle classes(i hope i will come in the future):P


    Last edited by Jelte; 08-11-2008 at 11:23 AM.

  4. #4
    Ethernal Noob
    Join Date
    Nov 2001
    you really should learn about classes early on since everything you do involves them. You shouldn't be using a string[] to represent an entity or object. It has no behavior, no convenient state, nor a convenient interface for users. The basics of classes are simple, you should learn them.

  5. #5
    The Programming Dutchman
    Join Date
    Jan 2008
    indigo0086: thanks for your reply, do you have some good suggestion for a good tutorial about classes?

    Greetings Jelte.

  6. #6
    and the Hat of Clumsiness GanglyLamb's Avatar
    Join Date
    Oct 2002
    between photons and phonons
    @Jelte: Normally my initial reply to your last question would be: look it up on google. (this site has tutorials as well but not for C# since thats not the real focus here).

    But since you also speak dutch which is something rare on this board (except for Maes who hasnt been on since ages ) I'll do the google for you:

    First hit on google for C# class tutorial

    In elk geval welkom!

  7. #7
    The Programming Dutchman
    Join Date
    Jan 2008
    Thanks you all, for your Help

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