CODEWITHSUNDEEP
c#arraysbuttonevent-handlingbuttonclick
yungCalculator
yungCalculator

Reputation: 41

How to pass an index of a button to an EventHandler?

Good to know is that I just started programming, so go easy on me ;)

In my program I make a board consisting of several buttons (btn[i, j]), which I create by using two for loops. These buttons are given a coordinate pair/index [i, j], then I pass this to a 2d array called valueBtn and I give that coordinate pair a value on the corresponding index.

        public void board(object obj, EventArgs ea)
        {
            int n = 6;
            Button[,] btn = new Button[n, n];
            for (int i = 0; i < n; i++)
            {
                for (int j = 0; j < n; j++)
                {
                    int p = 60 * i + 100;
                    int q = 60 * j + 100;
                    btn[i, j]          = new Button();
                    btn[i, j].Location = new Point(p, q);
                    btn[i, j].Size     = new Size(60, 60);

                    int[,] valueBtn = new int[n, n];
                    valueBtn[i, j]  = 0;

                    this.Controls.Add(btn[i, j]);
                }
            }
            btn[i, j].Click += btnPress;
        }

Next I have a new method btnPress which is linked to the EventHandler btn[i, j].Click. The intention is that in this method I find out which button has been pressed, and which coordinates/index belongs to this so that I can find the corresponding value in the 2d array valueBtn and eventually draw this value in a new function drawValue.

        public void btnPress(object sender, EventArgs ea)
        {
            Button pressedBtn = sender as Button;
            // Here I want to know which button is pressed and the index [i,j] of the button
            // so that I can find the value that belongs to the button in the 2d valueBtn array
            .
            .
            .
            this.Paint += drawValue;
        }

I've tried a lot with references to the EventHandler, but I just can't figure it out.

Thank you very much in advance for your time and help!

Upvotes: 1

Views: 252

Answers (1)

Vivek Nuna
Vivek Nuna

Reputation: 1

You can set the Text property of each button like btn[i, j].Text = some i j combination. and then get it in btnPress method like this string s = (sender as Button).Text;. You can also use Tag property, so basically concept is same.

Upvotes: 1

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