public static void OnBeforeNavigate(CanNavigateHandler onBeforeNavigate)
{
//We only keep track of one active BeforeNavigate event
foreach (Delegate d in Router.onBeforeNavigate.GetInvocationList())
{
Router.onBeforeNavigate -= (CanNavigateHandler)d;
}
if (onBeforeNavigate is null)
{
onBeforeNavigate = (a, b) => true;
}
Router.onBeforeNavigate += onBeforeNavigate;
}
private static CanNavigateHandler _beforeNavigate; // 2020-06-16 DWR: We previously used an event for this but only allowed a single delegate to bind to it, so there is no need for it to be multi-dispatch and so now it's just a field instead of an event
public static void OnBeforeNavigate(CanNavigateHandler onBeforeNavigate) => _beforeNavigate = onBeforeNavigate;
