C# issue adding static member to list

Question

I'm trying to add some objects in a listbox (throw a binding list), but when i'm displaying the list, the static member of the class has always the same display, the last value. There is no problem in my list or class for the other properties.

In my form:

    private void pictureBox1_MouseUp(object sender, MouseEventArgs e)
    {
         shape.gsPtAcc = ptdep;

         if (shape is Segment)
         {
             seg = shape as Segment;
             seg.gsScPtAcc = ptarr;
         }

         shape.incremNumber();
         Console.WriteLine(shape.Number);//write the correct value
         shapeList.Add(shape);
         listBox1.DataSource = null;
         listBox1.DataSource = shapeList;
        }
    }

In my mother class, shape:

namespace MyGraphicComponents
{
    abstract class Shape: IComparable<Shape>, IDrawable, INotifyPropertyChanged, IIsPointIn
    {
        protected MyPoint ptAcc;
        public MyPoint gsPtAcc
        {
            get { return ptAcc; }
            set { ptAcc = value; }
        }

        protected static int compt = 0;

        public int Number
        {
            get { return compt; }
            set { compt = value; }
        }
        public int incremNumber ()
        {
            return ++compt;
        }
    }
}

So the result, when i'm adding shape will be:

In the console: 1 2 3 4 5
But in the listbox: 5 5 5 5 5

Boo · Accepted Answer · 2016-03-18 15:50:12Z

2

A static member of a class will have the same value in all instances of this class classes

read more here : https://msdn.microsoft.com/fr-fr/library/98f28cdx.aspx

replace

  protected static int compt = 0;

with

protected int compt = 0;

answered Mar 18, 2016 at 15:50

Boo

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3 Comments

Remi Hirtz Over a year ago

Ok thanks, I solved it by Using number as a property, and by this way, I have been able to keep the static propertie, just have to do Number=incremNumber ();

Boo Over a year ago

@RemiHirtz why do you need this static property its seems like a mise use of static

Remi Hirtz Over a year ago

It's for school, I don't have the choice :s

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