'宣言 Public Delegate Sub NullableRoutedPropertyChangedEventHandler(Of T As {New, Struct})( _ ByVal sender As Object, _ ByVal e As NullableRoutedPropertyChangedEventArgs(Of T) _ )
public delegate void NullableRoutedPropertyChangedEventHandler<T>( object sender, NullableRoutedPropertyChangedEventArgs<T> e ) where T: new(), struct