Apologies : Exposing form controls to a class instance / object

[LondonJP]

Hi all,

First of all I'd like to apologise. There are many many posts about this around the net, however I just can't for the life of me get mine to work.

Simply, I was to be able to expose myTextBox or myListBox to a child class.

namespace MyApp
{
    public partial class MyNewApp : Form
    {
        public void doSomething(string s)
        {
            myFormListbox.items.add(s);
        }
 
        // Custom Class
        public static myClass myClassObject = new myClass();
        public class myClass
        {
            private string myVar;
 
            //Constructor
            public myClass()
            {
            }
            //Destuctor
            ~myClass()
            {
            }
            //Some things
            public string getKey()
            {
                return this.myVar;
            }
            public void setName(string sValue)
            {
                this.myVar = sValue;
            }
 
        public void addToListBox(string s)
        {
            doSomething("test");
        }
 
        }    
    }
}
 

Any pointers to anything obvious I'm doing wrong? I've tried using 'base' or 'form' and even tried passing the base form as a reference to the constructor.

Thanks for any help.
James

[Aimee Bailey]

I know it is possible to make a class definition within another class (nesting), but id strongly suggest against it as it then becomes very easy to get tangled in knots. Instead define the class below the form class, here is an example that will hopefully answer some of your questions.

public partial class MyNewApp : Form
{
    public string ParentVar;
    public MyClass instance1;
 
    public MyNewApp()
    {
        InitializeComponent();
        instance1 = new MyClass(this);
    }
 
 
    public void SetVar(string s)
    {
        instance1.MyVar = s;
    }
}
 
public class MyClass
{
    public string MyVar;
    public Form Owner;
 
    public MyClass(Form owner)
    {
        this.Owner = owner;
    }
 
    public void SetParentVar(string s)
    {
        Owner.ParentVar = s;
    }
}
 

All the best!

Aimee Bailey