Question

I am quite new to Winform dev. I have two list boxes. When the user double clicks an item in the first listbox, I want this to be copied to the second list box. The problem is that my double click method never gets fired.
here’s my code:

//here I register the event
this.fieldsArea.MouseDoubleClick += new MouseEventHandler(fieldsArea_MouseDoubleClick);

Then here is the double click method:

    private void fieldsArea_MouseDoubleClick(object sender, MouseEventArgs e)
    {
        MessageBox.Show("from method");
        int index = fieldsArea.IndexFromPoint(e.Location);
        string s = fieldsArea.Items[index].ToString();

        selectedFieldsArea.Items.Add(s);
    }

So I want the element from fieldsArea to be copied to selectedFieldsArea… The messagebox never shows and in debug I see that I never enter this method…
Am I missing something here?

ps: I have drag drop implemented which works well.

UPDATE: The problem comes from the MouseDown event also being implemented. So here’s my mousedown event.

private void fieldsArea_MouseDown(object sender, MouseEventArgs e)
    {
        if (fieldsArea.Items.Count == 0)
            return;
        int index = fieldsArea.IndexFromPoint(e.Location);
        string s = fieldsArea.Items[index].ToString();
        DragDropEffects dde1 = DoDragDrop(s,
            DragDropEffects.All);
    }

Answer 1

Make sure you don’t have other Mouse event like MouseClick MouseDown event registered, which could interfere with MouseDoubleclick event.

Update:

Add following code in your MouseDown event handler, you can check if it is a double-click first.

if(e.Clicks>1)
{
   int index = fieldsArea.IndexFromPoint(e.Location);
   string s = fieldsArea.Items[index].ToString();
   selectedFieldsArea.Items.Add(s); 
}

so here is your new handler:

private void fieldsArea_MouseDown(object sender, MouseEventArgs e)
{
  if (fieldsArea.Items.Count == 0)
            return;
  int index = fieldsArea.IndexFromPoint(e.Location);
  string s = fieldsArea.Items[index].ToString();

  if(e.Clicks>1)
  {          
       selectedFieldsArea.Items.Add(s); 
  }
  else
  {
        DragDropEffects dde1 = DoDragDrop(s,
        DragDropEffects.All);
  }
}