C# arraylist get/set - Overclock.net

ZHoob2004 · 09-11-09

For my programming class I need to modify an arraylist of "Button" objects from another class. I tried using get/set accessors but it tells me that an object reference is required. Any Ideas?

Code:

// variable declarations from the game1 class
// creates an arraylist "buttonlist" to hold object type Button as defined in the Button class

ArrayList buttonlist = new ArrayList();

public ArrayList ListButton
{ 
     get { return buttonlist; } 
     set { buttonlist = value; } 
}

Code:

// excerpt of code from mainMenu class
// attemps to add the button mainMenu1 to the public list ListButton, a part of the game1 class

Button mainMenu1;
mainMenu1 = new Button(new Vector2(50, 400), Game1.Content.Load<Texture2D>(@"Button"));
Game1.ListButton.add(mainMenu1);

I need ButtonList to be accessible from other classes and I'm trying to use ListButtons and get/set accessors to do so

decompiled · 09-11-09

Can you post all relevant code?

ZHoob2004 · 09-11-09

k OP updated with all applicable code

serge2k · 09-12-09

well I don't know very much C# but I put together your code in VS and the only problem I could find was that the add method should be capitalized.

kyotejones · 09-12-09

public varible?

Code:

public ArrayList buttonlist = new ArrayList();

ZHoob2004 · 09-12-09

I tried a public variable but c# isn't allowed to do that. you have to use the get/set stuff and it won't work.

kyotejones · 09-12-09

Code:

using System;
using System.Collections;

namespace consoletmp
{
    ///<summary>
    /// Simple Example
    ///</summary>
    public class storage
    {
        //Attributes
        private ArrayList aryList;

        //Constructors
        public storage()
        {
            aryList = new ArrayList();
        }

        public storage(ArrayList aryList)
        {
            this.aryList = aryList;
        }

        //Behaviors
        public void addToList(object tmpObj)
        {
            aryList.Add(tmpObj);
        }

        public void delFrmList(int aryIndex)
        {
            //aryIndex is the location in the array
            //you could get fancy pantsy and do it by matching an object but im too tired
            aryList.RemoveAt(aryIndex);
        }

        //Properties
        public ArrayList AryList
        {
            get { return aryList; }
        }

    }//end Class
}//end namespace

Then when your want to add stuff to it.

Code:

Class01 tempClass = new Class01();
tempClass.addToList(ButtonObject);

you can then pass that object "tempClass" around to other objects or functions. As for the public option yes you can set variables as public variables. Is it safe? depends on the program but you can do it in c#.

Spotswood · 09-12-09

Heh?

This compiles for me:

Code:

    public class Game
    {
        ArrayList buttonlist = new ArrayList();

        public ArrayList ListButton
        {
            get { return buttonlist; }
            set { buttonlist = value; }
        }
    }

    public class mainMenu
    {
        void SomeFunction()
        {
            Game Game1 = new Game();
            Game1.ListButton.Add("Works for me!");
        }
    }

ZHoob2004 · 09-12-09

I'll try out all the responses once I'm back to school on monday. +rep to everyone if it works.

MagicBox · 09-12-09

I'm cringing at the highly dirty coding style :P

If your object creates another object it's regarded the owner. You may not allow any object to overwrite or delete the first object's object.

Code:

public class Storage
{
  private ArrayList _array = new ArrayList(); // use underscore to indicate private field

  public ArrayList List
  {
    get { return _array; } // do not implement setter as to avoid outside to overwrite the object's array instance.
  }

  /* Shortcut getter/setter to the array */
  public object this[int index]
  {
    get { return _array[index]; }
    set { _array[index] = value; }
  }
}
..
..
Storage store = new Storage();
store.List.Add("Hello");
store.List.Add("World");

Console.Write("{0} {1}", store[0], store[1]);

Enjoy

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C# arraylist get/set

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