Question

I need a functionality to get all existing (open) instances of some conrete WPF window. I create those windows programatically in few places in code.

Is there a XAML/WPF solution for that? Something like GetInstancesByType(type)?

Answer 1

You can use the Application.Windows property:

foreach( var window in Application.Current.Windows.OfType<MyType>() )
{
    // do stuff
}

As H.B. pointed out, you would need to include System.Linq to get the OfType<T> extension method, but it’s not necessary.