[英]How to override OnLaunched() from Template10
我试图覆盖Template 10 Windows应用程序中的OnLaunched()函数,但是问题是它被密封在Template 10 BootStrapper类中(该类继承自Application类)。
这是我的方法:
using Windows.UI.Xaml;
...
namespace Sample {
...
sealed partial class App : Template10.Common.BootStrapper {
protected override void OnLaunched(LaunchActivatedEventArgs args)
{
/*************** My stuff *****************
***********************************************/
}
...
}
我正在为此应用程序使用Template10 Blank应用程序,BootStrapper类中的OnLaunched()方法是这样的:
namespace Template10.Common
{
public abstract class BootStrapper : Application
{
...
protected sealed override void OnLaunched(LaunchActivatedEventArgs e);
...
}
...
}
我无法从BootStrapper的OnLaunched()中删除密封的修饰符(猜测是因为它是“来自元数据”)。
在抽象类中包含密封方法有什么意义?
我们是否还有其他方法可以覆盖,例如OnResume(),OnStartAsync()等,而不是OnLaunched()?
更新:作为参考,以下是BootStrapper中的所有成员:
public abstract class BootStrapper : Application
{
public const string DefaultTileID = "App";
protected BootStrapper();
public static BootStrapper Current { get; }
public TimeSpan CacheMaxDuration { get; set; }
public INavigationService NavigationService { get; }
public StateItems SessionState { get; set; }
public bool ShowShellBackButton { get; set; }
protected Func<SplashScreen, UserControl> SplashFactory { get; set; }
public event EventHandler<WindowCreatedEventArgs> WindowCreated;
public static AdditionalKinds DetermineStartCause(IActivatedEventArgs args);
public NavigationService NavigationServiceFactory(BackButton backButton, ExistingContent existingContent);
[AsyncStateMachine(typeof(<OnInitializeAsync>d__44))]
public virtual Task OnInitializeAsync(IActivatedEventArgs args);
public virtual void OnResuming(object s, object e);
public abstract Task OnStartAsync(StartKind startKind, IActivatedEventArgs args);
[AsyncStateMachine(typeof(<OnSuspendingAsync>d__45))]
public virtual Task OnSuspendingAsync(object s, SuspendingEventArgs e);
public Dictionary<T, Type> PageKeys<T>() where T : struct, IConvertible;
public virtual T Resolve<T>(Type type);
public virtual INavigable ResolveForPage(Type page, NavigationService navigationService);
public void UpdateShellBackButton();
[AsyncStateMachine(typeof(<OnActivated>d__26))]
protected sealed override void OnActivated(IActivatedEventArgs e);
[AsyncStateMachine(typeof(<OnCachedFileUpdaterActivated>d__27))]
protected sealed override void OnCachedFileUpdaterActivated(CachedFileUpdaterActivatedEventArgs args);
[AsyncStateMachine(typeof(<OnFileActivated>d__28))]
protected sealed override void OnFileActivated(FileActivatedEventArgs args);
[AsyncStateMachine(typeof(<OnFileOpenPickerActivated>d__29))]
protected sealed override void OnFileOpenPickerActivated(FileOpenPickerActivatedEventArgs args);
[AsyncStateMachine(typeof(<OnFileSavePickerActivated>d__30))]
protected sealed override void OnFileSavePickerActivated(FileSavePickerActivatedEventArgs args);
protected sealed override void OnLaunched(LaunchActivatedEventArgs e);
[AsyncStateMachine(typeof(<OnSearchActivated>d__31))]
protected sealed override void OnSearchActivated(SearchActivatedEventArgs args);
[AsyncStateMachine(typeof(<OnShareTargetActivated>d__32))]
protected sealed override void OnShareTargetActivated(ShareTargetActivatedEventArgs args);
protected sealed override void OnWindowCreated(WindowCreatedEventArgs args);
public enum AdditionalKinds
{
Primary,
Toast,
SecondaryTile,
Other
}
public enum BackButton
{
Attach,
Ignore
}
public enum ExistingContent
{
Include,
Exclude
}
public enum StartKind
{
Launch,
Activate
}
}
请帮忙 :}
模板10不允许我们重写OnLaunched()方法。 相反,我们可以为此目的重写OnInitializeAsync()和OnStartAsync()方法。
原因是模板10建议我们使用一种称为“单页模型”的东西,它只不过是使用Page类的单个实例放入框架提供的空框架中。 这对我们有什么好处? 好吧,如果我们需要在应用程序中放置一个菜单(例如汉堡菜单),则需要在我们在应用程序中创建的每个页面中复制该菜单的代码。 这将导致冗余,不一致,WET代码等问题。
因此,模板10最初会创建一个称为Shell的页面,然后将每个页面的内容加载到此Shell页面中,而不是创建新的Pages。
我们可以通过以下方式覆盖这些方法:
sealed partial class App : BootStrapper
{
public App()
{
this.InitializeComponent();
}
public override Task OnInitializeAsync(IActivatedEventArgs args)
{
var nav = NavigationServiceFactory(BackButton.Attach, ExistingContent.Include);
Window.Current.Content = new Views.Shell(nav);
return Task.FromResult<object>(null);
}
public override Task OnStartAsync(BootStrapper.StartKind startKind, IActivatedEventArgs args)
{
NavigationService.Navigate(typeof(Views.MainPage));
return Task.FromResult<object>(null);
}
}
我在这里找到答案的地方: https : //github.com/Windows-XAML/Template10/wiki/Docs-%7C-HamburgerMenu
因此,长话短说,请重写OnInitializeAsync()或OnStartAsync(),而不是OnLaunched()。
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