this.Invoke throws cannot convert from 'method group' to 'System.Delegate'

Question

I don't know how to explain that, so here is my code:

this.Invoke(listBox1.Items.Add, new Object[] { e.Data.ToString() });

But, everything would be ok, if I wouldn't have any errors, but sadly I have 2 errors:

Error 1

The best overloaded method match for 'System.Windows.Forms.Control.Invoke(System.Delegate, params object[])' has some invalid arguments

Error 2

Argument 1: cannot convert from 'method group' to 'System.Delegate'

What should I do to overcome these exceptions?

Answer 1

Invoke requires you to use a delegate as first parameter. ListBox.Items.Add is a method, not a delegate.

You can, however, use this:

this.Invoke((Action)delegate()
{
    listBox1.Items.Add(e.Data.ToString());
});

Answer 2

Set a delegate to work with.

Invoke(new Action(() => 
{ 
  // Do it 
}));

Answer 3

You batter check if te control needs invoke, if so invoke it:

if(listBox1.InvokeRequired)
     listBox1.Invoke((Action)(()=> listBox1.Items.Add(e.Data.ToString())); //if e.Data is the object to add it to listBox!