public async Task <bool> NavigateAsync <TView, TViewModel>(TViewModel viewModel)
where TView : UserControl, new()
where TViewModel : INavigationAware
{
var previousView = _frame.Content;
var success = await CanNavigateAsync(new NavigatingEventArgs(typeof(TView), previousView?.GetType()));
if (!success)
{
return(false);
}
var dispatcher = _frame.Dispatcher;
var pattern = new NavigationHandlerTaskSource(
handler => Navigated += handler,
handler => Navigated -= handler);
if (dispatcher.CheckAccess())
{
success = await navigateAsync <TView, TViewModel>(viewModel);
}
else
{
await dispatcher.InvokeAsync(async() => await navigateAsync <TView, TViewModel>(viewModel));
}
await pattern.Task;
return(success);
}
public async Task <bool> NavigateAsync(Type viewType, INavigationAware viewModel)
{
Tracer.Info($"Trying to navigate to {viewType.FullName}.");
var previousView = _frame.Content;
var success = await CanNavigateAsync(new NavigatingEventArgs(viewType, previousView?.GetType()));
if (!success)
{
Tracer.Info("Navigation failed.");
return(false);
}
var dispatcher = _frame.Dispatcher;
var pattern = new NavigationHandlerTaskSource(
handler => Navigated += handler,
handler => Navigated -= handler);
var view = _container.Resolve(viewType) as UserControl;
Guard.RequireIsNotNull(view, nameof(view));
if (dispatcher.CheckAccess())
{
success = await navigateAsync(view, viewModel);
}
else
{
await dispatcher.InvokeAsync(async() => success = await navigateAsync(view, viewModel));
}
await pattern.Task;
Tracer.Info($"Navigation {(success ? "succeeded" : "failed")}.");
return(success);
}