protected override void OnNavigatedTo(NavigationEventArgs e)
{
this.ViewModel = (ViewModels.TodoItemViewModel)e.Parameter;
Frame rootFrame = Window.Current.Content as Frame;
Windows.UI.Core.SystemNavigationManager.GetForCurrentView().AppViewBackButtonVisibility =
Windows.UI.Core.AppViewBackButtonVisibility.Visible;
}
public static TodoItemViewModel GetInstance()
{
if (todoItemViewModel == null)
{
todoItemViewModel = new TodoItemViewModel();
}
return(todoItemViewModel);
}
/// <summary>
/// 在应用程序由最终用户正常启动时进行调用。
/// 将在启动应用程序以打开特定文件等情况下使用。
/// </summary>
/// <param name="e">有关启动请求和过程的详细信息。</param>
protected override void OnLaunched(LaunchActivatedEventArgs e)
{
Frame rootFrame = Window.Current.Content as Frame;
// 不要在窗口已包含内容时重复应用程序初始化，
// 只需确保窗口处于活动状态
if (rootFrame == null)
{
// 创建要充当导航上下文的框架，并导航到第一页
rootFrame = new Frame();
rootFrame.NavigationFailed += OnNavigationFailed;
if (e.PreviousExecutionState == ApplicationExecutionState.Terminated)
{
//TODO: 从之前挂起的应用程序加载状态
if (ApplicationData.Current.LocalSettings.Values.ContainsKey("NavigationState"))
{
rootFrame.SetNavigationState((string)ApplicationData.Current.LocalSettings.Values["NavigationState"]);
}
issuspend = false;
}
// 将框架放在当前窗口中
Window.Current.Content = rootFrame;
}
if (e.PrelaunchActivated == false)
{
if (rootFrame.Content == null)
{
// 当导航堆栈尚未还原时，导航到第一页，
// 并通过将所需信息作为导航参数传入来配置
// 参数
ViewModels.TodoItemViewModel Vmv = new ViewModels.TodoItemViewModel();
rootFrame.Navigate(typeof(MainPage), e.Arguments);
ApplicationView.GetForCurrentView().SetPreferredMinSize(new Size {
Width = 320, Height = 480
});
}
// 确保当前窗口处于活动状态
Window.Current.Activate();
}
Windows.UI.Core.SystemNavigationManager.GetForCurrentView().BackRequested += OnBackRequested;
}