C# Create Dynamic Buttons and onClick Dynamic EventHandlers

Question

My program creates buttons dynamically.

private void CreateButton(string buttonName)
{

   Color[] c = { Color.Red, Color.Teal, Color.Blue, Color.WhiteSmoke };

   transbutton = new Button();
   transbutton.BackColor = c[2];
   transbutton.Text = buttonName;
   transbutton.Name = buttonName + "Button";
   transbutton.Width = 150;
   transbutton.Height = 150;
   transbutton.Font = new Font("Segoe UI", 13);
   transbutton.ForeColor = Color.White;

   transbutton.Click += new EventHandler(transbutton_Click);
}

private void transbutton_Click(object sender, EventArgs e)
{

   tbList.Text = transbutton.Text;
}

enter image description here

What I am trying to do is when the user clicks on the button(s) it adds the name of the button into the multiline TextBox such as in the picture above. I created an EventHandler but cant figure it out how to make it work with dynamic buttons.

Are you adding your buttons to the screen/form? (I don't see a call in your code) — gunr2171
– gunr2171, Commented May 2, 2013 at 20:41

Geeky Guy · Accepted Answer · 2014-07-30 12:53:54Z

7

You have a reference to the button that was clicked right there as the sender argument. So...

private void transbutton_Click(object sender, EventArgs e)
    {
       tbList.Text += "\r\n" + ((Button)sender).Text;
    }

edited Jul 30, 2014 at 12:53

answered May 2, 2013 at 20:31

Geeky Guy

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1 Comment

Geeky Guy Over a year ago

It works with anything that fires an event (all windows and web controls, for example). The sender argument is always the object that fired the event, so you can always cast it to its original type and use its properties ;)

rithish · Accepted Answer · 2013-10-22 10:52:14Z

0

use button array like this.it will create 3 dynamic buttons bcoz h variable has value of 3

public void button_Click(object sender, EventArgs e)
{
 if( sender == buttonArray[0] )
  {


  MessageBox.Show("hello");
   }

 }

private void button1_Click(object sender, EventArgs e)
{

    int h =3;


    Button[] buttonArray = new Button[8];

    for (int i = 0; i <= h-1; i++)
    {
       buttonArray[i] = new Button();
       buttonArray[i].Size = new Size(20, 43);
       buttonArray[i].Name= ""+i+"";
       buttonArray[i].Click += button_Click;//function
       buttonArray[i].Location = new Point(40, 20 + (i * 20));
        panel1.Controls.Add(buttonArray[i]);

    }
}

answered Oct 22, 2013 at 10:52

rithish

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