Question

I want to cast both MenuItem objects and Button control objects to an object type of whose ‘Tag’ property I can reference.

Is there such an object type?

E.g.

void itemClick(object sender, EventArgs e) {     Control c = (Control)sender;     MethodInvoker method = new MethodInvoker(c.Tag.ToString(), 'Execute');     method.Invoke(); } 

Except this fails – ‘Unable to cast object type ‘System.Windows.Forms.MenuItem’ to type ‘System.Windows.Forms.Control’

What can replace Control in this example?

Answer 1

Use ‘as’ operator.

object tag; Button button; MenuItem menuItem = sender as MenuItem; if (menuItem  != null) {     tag = menuItem.Tag; } else if( (button = sender as Button) != null ) {     tag = button.Tag; }  else  {     //not button nor MenuItem  }