Question

I have a function that deselect all selected items in the listbox when the user right clicks on listbox. Is there a way to apply this function to all listboxes in my project?

I want to know if there’s another way , not making a class and put the function in the class etc:

public class selectedListbox{
   private void setSelected(ListBox details){
   details.MouseDown += new System.Windows.Forms.MouseEventHandler(this.listBoxDeselectAll);
   }

   private void listBoxDeselectAll(object sender, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Right)
            {
                ((ListBox)sender).ClearSelected();
            }
        }

}

and then for each listbox to do this:

selectedListBox h = new selectedListBox();
h.setSelected(listboxNameHere);

Answer 1

maybe with an extension + lambda?

public static class ListBoxSelectExtension
{
  public static void SetSelected(this ListBox Me)
  {
      Me.MouseDown +=
          (sender, e) =>
          {
              if (e.Button == MouseButtons.Right)
                  ((ListBox)sender).ClearSelected();
          };
  }
}

this way you can do the following without having to instantiate a new class or having to have all your listboxes be a derived class:

MyListBox1.SetSelected();
MyListBox2.SetSelected();

etc.