Всем привет, пишу UWP-приложение с постраничной навигацией(MVVM).
Интерфейс навигации
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/// <summary>
/// Provides a mechanism to navigate between pages.
/// </summary>
public interface INavigationService
{
/// <summary>
/// Gets the name of the currently displayed page.
/// </summary>
string CurrentPage { get; }
/// <summary>
/// Navigates to the specified page.
/// </summary>
/// <param name="page"></param>
void NavigateTo(string page);
/// <summary>
/// Navigates to the specified page and
/// supply additional page-specific parameters.
/// </summary>
/// <param name="page"></param>
/// <param name="parameter"></param>
void NavigateTo(string page, object parameter);
/// <summary>
/// Navigates to the previous page in the navigation history.
/// </summary>
void GoBack();
}
}
Его реализация
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/// <summary>
/// Provides a mechanism to navigate between pages.
/// </summary>
public sealed class NavigationService : INavigationService
{
private readonly IDictionary<string, Type> pages_
= new Dictionary<string, Type>();
/// <summary>
/// The name of the virtual "root" page at the top of the navigation history.
/// </summary>
public const string RootPage = "(Root)";
/// <summary>
/// A moniker for an "unknown" page when navigation happens without
/// using the <see cref="NavigationService"/>.
/// </summary>
public const string UnknownPage = "(Unknown)";
private static Frame AppFrame
{
get
{
return ((Window.Current.Content as Frame)?.Content as MainPage)?.AppFrame;
}
}
public void Configure(string page, Type type)
{
lock (pages_)
{
if (pages_.ContainsKey(page))
throw new ArgumentException("The specified page is already registered.");
if (pages_.Values.Any(v => v == type))
throw new ArgumentException("The specified view has already been registered under another name.");
pages_.Add(page, type);
}
}
public NavigationService()
{
}
#region INavigationService Implementation
/// <summary>
/// Gets the name of the currently displayed page.
/// </summary>
public string CurrentPage
{
get
{
var frame = AppFrame;
if (frame.BackStackDepth == 0)
return RootPage;
if (frame.Content == null)
return UnknownPage;
var type = frame.Content.GetType();
lock (pages_)
{
if (pages_.Values.All(v => v != type))
return UnknownPage;
var item = pages_.Single(i => i.Value == type);
return item.Key;
}
}
}
/// <summary>
/// Navigates to the specified page.
/// </summary>
/// <param name="page"></param>
public void NavigateTo(string page)
{
NavigateTo(page, null);
}
/// <summary>
/// Navigates to the specified page and
/// supply additional page-specific parameters.
/// </summary>
/// <param name="page"></param>
/// <param name="parameter"></param>
public void NavigateTo(string page, object parameter)
{
lock (pages_)
{
if (!pages_.ContainsKey(page))
throw new ArgumentException("Unable to find a page registered with the specified name.");
//System.Diagnostics.Debug.Assert(AppFrame != null);
AppFrame.Navigate(pages_[page], parameter);
}
}
/// <summary>
/// Navigates to the previous page in the navigation history.
/// </summary>
public void GoBack()
{
//System.Diagnostics.Debug.Assert(AppFrame != null);
if (AppFrame.CanGoBack)
AppFrame.GoBack();
}
#endregion
}
Регистрирую в контейнере зависимости ViewModels
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public class ViewModelLocator
{
private IKernel Kernel { get; }
public ViewModelLocator()
{
Kernel = new StandardKernel();
string UserPath = ApplicationData.Current.LocalFolder.Path;
Kernel.Bind<ApplicationDbContext>()
.ToSelf()
.InTransientScope()
.WithConstructorArgument("DbPath", UserPath);
//Создаем папку для хранения файлов
var WorkedDir = Path.Combine(UserPath, "DataStore");
if (!Directory.Exists(WorkedDir))
Directory.CreateDirectory(WorkedDir);
Get<ApplicationDbContext>().Database.EnsureCreated();
MapperConfiguration configuration = new MapperConfiguration(cfg =>
{
cfg.CreateMap<Container, SelectedContainerDto>();
cfg.CreateMap<SelectedContainerDto, VisualContainer>();
});
IMapper mapper = configuration.CreateMapper();
Kernel.Bind<IMapper>().ToConstant(mapper);
var nav = new NavigationService();
nav.Configure("MainPage", typeof(MainPage));
nav.Configure("ContainerSprav", typeof(ContainerSprav));
nav.Configure("AddContainer", typeof(AddContainer));
nav.Configure("AddFlightType", typeof(FlightTypeSprav));
nav.Configure("CreateDiagram", typeof(CreateDiagram));
nav.Configure("FilledElementSprav", typeof(FilledElementSprav));
nav.Configure("ServingSprav", typeof(ServingSprav));
nav.Configure("ServingClassSprav", typeof(ServingClassSprav));
nav.Configure("MeasureUnitSprav", typeof(MeasureUnitSprav));
nav.Configure("CreateNewItemContainer", typeof(CreateNewItemContainer));
nav.Configure("AddContainerItemToLevel", typeof(AddContainerItemToLevel));
Kernel.Bind<INavigationService>().ToConstant(nav);
Kernel.Bind<MenuVM>().ToConstant(new MenuVM(Get<INavigationService>()));
Kernel.Bind<ApplicationViewModel>().ToConstant(new ApplicationViewModel());
Kernel.Bind<ICbaseFlightInfo>().ToConstant(new OracleDataFetcher());
Kernel.Bind<IFlightsData>()
.To<FlightDataFetcher>()
.InTransientScope();
//Создание диаграммы
Kernel
.Bind<CreateDiagramViewModel>()
.ToSelf()
.InSingletonScope()
.WithConstructorArgument("flightsData",Get<IFlightsData>())
.WithConstructorArgument("mapper", Get<IMapper>())
.WithConstructorArgument("navigationService", Get<INavigationService>());
Kernel.Bind<AddContainerItemToLevelViewModel>()
.ToSelf()
.WithConstructorArgument("containerItems", Get<EFCoreGenericRepository<ContainerItem>>());
}
private T Get<T>() => Kernel.Get<T>();
///Раздаем ViewModel для Pages
public ApplicationViewModel ApplicationViewModel => Get<ApplicationViewModel>();
public MenuVM MenuViewModel => Get<MenuVM>();
public ContainersViewModel ContainersViewModel => Get<ContainersViewModel>();
public AddContainerViewModel AddContainerViewModel => Get<AddContainerViewModel>();
public AddContainerItemToLevelViewModel AddContainerItemToLevelViewModel => Get<AddContainerItemToLevelViewModel>();
}
Регистрирую локатор для всего приложения в App.xaml
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<Application
x:Class="App"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:CbaseDiagram"
xmlns:locator="using:Locator.Locator">
<Application.Resources>
<locator:ViewModelLocator x:Key="Locator" />
</Application.Resources>
</Application>
В Page получаю ViewModel из конструктора
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<Page
x:Class="CbaseDiagram.Views.AddContainer"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:CbaseDiagram.Views"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d"
Background="{ThemeResource ApplicationPageBackgroundThemeBrush}"
DataContext="{Binding AddContainerViewModel,Source={StaticResource Locator}}"/>
Если из ViewModel нужно перейти на другую страницу, то делаю инъекцию сервиса навигации в конструктор и вызываю метод навигации
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// вызов команды навигации
NavigateToCreationOfNewContainerItem = new RelayCommand(() => navigationService.NavigateTo("CreateNewItemContainer"));
Проблема в том, что если хочу вместе с навигацией передавать параметр,
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NavigateToCreationOfNewContainerItem = new RelayCommand(() => navigationService.NavigateTo("CreateNewItemContainer",parameter))
то я не могу его поймать во принимающей ViewModel, страницы на которую переходят.
Пытался у принимающей Page привязать событие OnNavigatedTo, но почему-то падает в ошибку, типа нет такого события.
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<Page>
<interactivity:Interaction.Behaviors>
<core:EventTriggerBehavior EventName="OnNavigatingTo">
<core:InvokeCommandAction Command="{Binding OnNavigatedToCommand}" />
</core:EventTriggerBehavior>
</interactivity:Interaction.Behaviors>
$exception {Windows.UI.Xaml.Markup.XamlParseException: Не удалось найти текст, связанный с этим кодом ошибки.
Cannot add instance of type 'Microsoft.Xaml.Interactions.Core.EventTriggerBehavior' to a collection of type 'Microsoft.Xaml.Interactivity.BehaviorCollection'. [Line: 19 Position: 82]
at Windows.UI.Xaml.Application.LoadComponent(Object component, Uri resourceLocator, ComponentResourceLocation componentResourceLocation)
at CbaseDiagram.Views.AddContainerItemToLevel.InitializeComponent()
at CbaseDiagram.Views.AddContainerItemToLevel..ctor()} Windows.UI.Xaml.Markup.XamlParseException
Как можно без прокси поймать передаваемый параметр в принимающей ViewModel?
