Handling mouseover for multiple controls in same method

Question

I am trying to handle mouseover and mouseleave events for multiple controls in the same method. My form has 10 different buttons which I need to handle their mouse events. Now normally I would do something like this:

  public Form1()
  {
       InitializeComponent();
       button1.MouseEnter += new EventHandler(button1_MouseEnter);
       button1.MouseLeave += new EventHandler(button1_MouseLeave);
  }

  void button1_MouseLeave(object sender, EventArgs e)
  {
       this.button1.BackgroundImage = ((System.Drawing.Image)(Properties.Resources.img1));
  }


  void button1_MouseEnter(object sender, EventArgs e)
  {
       this.button1.BackgroundImage = ((System.Drawing.Image)(Properties.Resources.img2));
  }

But since that I have 10 controls which are basically handled the same way, I find it impractical to do a seperate method for each control, in my case its 20 methods that will do almost the same thing but to a different control.

So is there a way to integrate those events into one and just determine which control should be handled.

Edit:

Can thee be a way to determine which exact control raised the event, lets assume that I have a picturebox which changes the image depending on the button being hovered.

Answer 1

Yes, just use the same event handler for all controls when you assign the handlers. Inside the handler, use an if() to determine which control raised the event.

void SomeEvent_Handler ( object sender, EventArgs e )
{
    if ( sender == btn1 ) // event is from btn1
    {
        btn1....;
    }
    else if ( sender == checkbox1 ) // event is from checkbox1
    {
        checkbox1.....;
    }
}

Answer 2

You should be able to use the same handler for all of your controls, especially since BackgroundImage is a shared property of Control, not Button:

      public Form1()
      {
           InitializeComponent();
           button1.MouseEnter += control_MouseEnter;
           button1.MouseLeave += control_MouseLeave;
           button2.MouseEnter += control_MouseEnter;
           button2.MouseLeave += control_MouseLeave;
      }

      void control_MouseEnter(object sender, EventArgs e)
      {
           Control control = sender as Control;
           if (control != null)
               control.BackgroundImage = ((System.Drawing.Image)(Properties.Resources.img1));
      }


      void control_MouseEnter(object sender, EventArgs e)
      {
           Control control = sender as Control;
           if (control != null)
               control.BackgroundImage = ((System.Drawing.Image)(Properties.Resources.img2));
      }