Question

I have the following code:

foreach (var control in this.Controls)
{

}

I want to do something like control.Hide() in there. But the items in the this.Controls collection are not of type Control (they are Object).

I can’t seem to remember the safe way to cast this to call hide if it is really of type Control and do nothing otherwise. (I am a transplanted delphi programmer and I keep thinking something like control is Control.)

Answer 1

Here’s a case where you don’t want to use var.

foreach (Control control in this.Controls)
{
    control.Hide();
}

does exactly what you want.

Test it if you do not believe.

For other scenarios where you could potentially have a mixed collection, you could do something like

foreach (var foo in listOfObjects.OfType<Foo>())
{

}