List of Objects !!!

[CSG-SQU]

Hello all,

i want to creat a list of an object
so i used ArrayList in C#

after declaring a class book
i declare the array list as follwing:

private ArrayList mobileStore = new ArrayList();

then i have an object of class , say Mobile

Mobile m1;

and finally i tried to add the object m1 to the array list

mobileStore.Add(m1);
but the error occurs !!

Invalid token '(' in class, struct, or interface member declarationInvalid token ')' in class, struct, or interface member declaration

-------------------

then i tried anoter way :

List<Mobile> store = new List<Mobile>();

but the problem was the same ????

how can i fix it ?

[vksingh24]

I think you need to create the instance of your mobile class before you add in in ArrayList.

Mobile m1=new Mobile();

[CSG-SQU]

I think you need to create the instance of your mobile class before you add in in ArrayList.

Mobile m1=new Mobile();

i already didi !!
the problem is the same !!

[Geekitygeek]

i already didi !!
the problem is the same !!

Without seeing all of your code its hard to give a defintie aswer, but is the line mobileStore.Add(m1); inside a method or is it at the class level?

You may be missing a closing bracket or have this at the wrong level, any code other than declarations need to be inside a method. Try placing it inside a constructor:

public partial class Form1 : Form
    {
        List<Mobile> mobileStore = new List<Mobile>();

        public Form1()
        {
            InitializeComponent();

            Mobile m1 = new Mobile();
            mobileStore.Add(m1);
        }
     }

[CSG-SQU]

I think you need to create the instance of your mobile class before you add in in ArrayList.

Mobile m1=new Mobile();

Without seeing all of your code its hard to give a defintie aswer, but is the line mobileStore.Add(m1); inside a method or is it at the class level?

You may be missing a closing bracket or have this at the wrong level, any code other than declarations need to be inside a method. Try placing it inside a constructor:

public partial class Form1 : Form
    {
        List<Mobile> mobileStore = new List<Mobile>();

        public Form1()
        {
            InitializeComponent();

            Mobile m1 = new Mobile();
            mobileStore.Add(m1);
        }
     }

ummmm
why you have been used form()?

this is my code

public class Mobile
    {
        // DECLARATION --------------------
        private string name;
        private string desc;
        private string img;
        private double price;
        private int quan;

        // Mobile Class Constructor -------
        public Mobile(string name,string desc,string img,double price,int quan)
        {
            name = name;
            desc = desc;
            img = img;
            price = price;
            quan = quan;
        }

        // Mobile Name Class Prop ---------
        public string Name
        {
            get { return name; }
            set { name = value; }
        }
        // Mobile Describtion Class Prop --
        public string Desc
        {
            get { return desc; }
            set { desc = value; }
        }
        // Image file name Class Prop -----
        public string Img
        {
            get { return img; }
            set { img = value; }
        }
        // Mobile Price Class Prop --------
        public double Price
        {
            get { return price; }
            set { price = value; }
        }
        // Mobile Quantity Class Prop ------
        public int Quan
        {
            get { return quan; }
            set { quan = value; }
        }

    }// End MOILE CLASS =)

    public class Web
    {
        //create a collection of object (LIST)
    
        Mobile m1 = new Mobile ("mobile" ," new mobile" , " img " , 100,3);
        
        //ArrayList mobileStore = new ArrayList();
        //mobileStore.Add(m1);
        
        List<Mobile> store = new List<Mobile>();
        store.Add(m1);

    }//End WEB CLASS =)

    public partial class _Default : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            
        }
    }

[CSG-SQU]

i also tried this way::

ArrayList mobileStore = new ArrayList();
        mobileStore.Add(new Mobile( "mobile" ," new mobile" , " img " , 100,3) );

:( !!???

[vksingh24]

I researched some with google and one quick solution is put your code in a method. like

public class Web
    {
        //create a collection of object (LIST)

        private int test()
        {
            Mobile m1 = new Mobile("mobile", "new mobile", "img", 100, 3);

            ArrayList mobileStore = new ArrayList();
            mobileStore.Add(m1);
            return 0;

        }
        
    }//End WEB CLASS =)

[Geekitygeek]

I used a form because i didnt know the context of your problem.
The point was that you cant add items to the collection at the class level, you need to mvoe the code into a method so that the compiler knows when to run it:

public class Web
    {
        //create a collection of object (LIST)
        List<Mobile> store = new List<Mobile>();
        
        Public Web()
        {
             Mobile m1 = new Mobile ("mobile" ," new mobile" , " img " , 100,3);
             store.Add(m1);
        }
     }

Public Web() is the constructor for the Web class. The containing code is run when the class is instantiated.

[Geekitygeek]

I researched some with google and one quick solution is put your code in a method. like

public class Web
    {
        //create a collection of object (LIST)

        private int test()
        {
            Mobile m1 = new Mobile("mobile", "new mobile", "img", 100, 3);

            ArrayList mobileStore = new ArrayList();
            mobileStore.Add(m1);
            return 0;

        }
        
    }//End WEB CLASS =)

Great minds work alike,eh :p we posted near identical call at teh same time :p

Just remember that doing it this way you would need to explicitly call the "test()" method to populate the collection. But you are right, as i pointed out earlier, you cannot add to the collection at the class level.

The code i posted is essentially the same except that instead of a named method i used the classes constructor since that is always called when the class is instantiated.

[CSG-SQU]

I used a form because i didnt know the context of your problem.
The point was that you cant add items to the collection at the class level, you need to mvoe the code into a method so that the compiler knows when to run it:

public class Web
    {
        //create a collection of object (LIST)
        List<Mobile> store = new List<Mobile>();
        
        Public Web()
        {
             Mobile m1 = new Mobile ("mobile" ," new mobile" , " img " , 100,3);
             store.Add(m1);
        }
     }

Public Web() is the constructor for the Web class. The containing code is run when the class is instantiated.

i guess it work !!

thank you
i will try it

[vksingh24]

Yes I am new to C# and still learning the bits and pices. You are right to say that you can not add itmes in Collection at class level...Lesson Learned for me..Thanks

[Geekitygeek]

No problem, glad we could clear up your problem :)

Remember to mark the thread as solved

[RunTimeError]

Here is an example of an object:

//The Card Object. Global Object
class Card
{
        public int value;
        public string suit;
        public string type;
        public string image;
}
static void Main()
{
      Program myProgram = new Program();
      myProgram.createCard();
}
private void createCard()
{      
     //Create a new instance card object 
      Card card = new Card(); 
      //Add values
      card.value = 5;
      card.suit = "spades";
      card.type = "Number";
      card.image = "spades5.png";
      
      //Create an array of Card Object
      Card[] deck = new Card[1];
      deck[0] = card;
     
     //Or create an array list
     ArrayList deckList = new ArrayList();
     decklist.Add(card);
}