如何使用MVVM导航窗口进行WPF？ [英] How to navigate through windows with MVVM Light for WPF?
问题描述
我需要很多意见，而且我不清楚如何通过Windows管理导航。
首先，MVVM Light中提供的模板用于创建新的WPF MVVM视图，创建一个新的窗口，不可用于按帧导航（我的意思是，放置一个框架在 mainView 中，并将源路径更改为导航）。
我只需要更改窗口到页面为我使用模板创建的所有视图
或有没有一种不同的方法来使用MVVM Light工具包来执行WPF导航？
最后我这样做了。 p>
按照o_q的想法，我创建了NavigationWindow作为MainWindow，并将所有视图更改为页面。
然后，我创建了一个使用导航的界面和类：
public interface INavigationService
{
事件NavigatingCancelEventHandler导航;
void NavigateTo（Uri pageUri）
void GoBack（）;
}
public class NavigationService：INavigationService
{
private NavigationWindow _mainFrame;
#region实现INavigationService
public event NavigatingCancelEventHandler导航;
public void NavigateTo（Uri pageUri）
{
if（EnsureMainFrame（））
{
_mainFrame.Navigate（pageUri）;
}
}
public void GoBack（）
{
if（EnsureMainFrame（）
& _mainFrame .CanGoBack）
{
_mainFrame.GoBack（）;
}
}
#endregion
private bool EnsureMainFrame（）
{
if（_mainFrame！ = null）
{
return true;
}
_mainFrame = System.Windows.Application.Current.MainWindow as NavigationWindow;
如果（_mainFrame！= null）
{
//如果应用程序在设计工具中运行，则可以为null
_mainFrame.Navigating + =（s，e ）=>
{
if（Navigating！= null）
{
浏览（s，e）;
}
};
返回true;
}
return false;
}
}
然后，在viewModelLocator中，我创建了将const字符串存储到我的视图的路径：
public class ViewModelLocator
{
#region视图路径
public const string FrontendViewPath =../Views/FrontendView.xaml;
public const string BackendViewPath =../Views/BackendView.xaml;
public const string StartUpViewPath =../Views/StartUpView.xaml;
public const string LoginViewPath =../Views/LoginView.xaml;
public const string OutOfOrderViewPath =../Views/OutOfOrderView.xaml;
public const string OperativeViewPath =../Views/SubViews/OperativeView.xaml;
public const string ConfigurationViewPath =../Views/SubViews/ConfigurationView.xaml;
#endregion
在App.cs中，在Application_Startup事件处理程序中，借助于Unity IoC我注册了一个NavigationService的单例：
public partial class App：System.Windows.Application
{
private static IUnityContainer _ambientContainer;
public static IServiceLocator AmbientLocator {get;私人集合}
...
private void Application_Startup（object sender，System.Windows.StartupEventArgs e）
{
_ambientContainer =
new UnityContainer（）;
_ambientContainer.RegisterType< INavigationService，NavigationService>（new ContainerControlledLifetimeManager（））;
AmbientLocator = new UnityServiceLocator（_ambientContainer）;
ServiceLocator.SetLocatorProvider（（）=> AmbientLocator）;
现在，在我的ViewModelLocator中，我可以注册一个Galasoft消息来捕获所有的事件和导航到页面在我的构造函数中：
public ViewModelLocator（）
{
CreateMain（）;
CreateFrontend（）;
CreateBackend（）;
CreateStartUp（）;
CreateOperative（）;
CreateLogin（）;
CreateConfiguration（）;
CreateOutOfOrder（）;
//设置Sturtup页面...
ServiceLocator.Current.GetInstance< INavigationService>（）。NavigateTo（new Uri（StartUpViewPath，UriKind.Relative））;
Messenger.Default.Register< MoveToViewMessage>（this，message =>
{
switch（message.StateInfo.StateType）
{
case StateType.StartUpState：
ServiceLocator.Current.GetInstance< INavigationService>（）。NavigateTo（new Uri（StartUpViewPath，UriKind.Relative））;
break;
case StateType.LoginState ：
ServiceLocator.Current.GetInstance< INavigationService>（）。NavigateTo（new Uri（LoginViewPath，UriKind.Relative））;
break;
case StateType.OperativeState：
ServiceLocator。 Current.GetInstance< INavigationService>（）。NavigateTo（new Uri（OperativeViewPath，UriKind.Relative））;
break;
case StateType.ConfigurationState：
ServiceLocator.Current.GetInstance< INavigationService& （）。NavigateTo（new Uri（ConfigurationViewPath，UriKind.Relative））;
break;
case StateType.ClosedState：
case StateType.OutOfOrderState：
ServiceLocator.Current.GetInstance< INavigationService>（）。NavigateTo（new Uri（OutOfOrderViewPath，UriKind.Relative））;
break;
默认值：
ServiceLocator.Current.GetInstance< INavigationService>（）。NavigateTo（new Uri（StartUpViewPath，UriKind.Relative））;
break;
}
}）;
}
这样，我保留所有的viewModelsignorant。 ..他们不了解任何关于导航，加上我没有代码背后。
如果我需要通过使用视图导航，我可以解决NavigationService从连接的视图模型，并导航到我需要的页面。
最重要的是，它的工作原理！
I've just started a new project in which the presentation layer will be done by WPF and MVVM Light by GalaSoft.
I need a lot of views and it's not clear to me how to manage navigation through windows.
First of all, the templates offered in MVVM Light for creating a new "WPF MVVM View" create a new Window that is not possible to use for navigation by frame (I mean, by putting a frame in mainView and changing the source path to navigate).
Do I simply have to change Window to Page for all the views I create using templates?
Or is there a different way to perform navigation in WPF with the MVVM Light toolkit?
Eventually I did it this way.
Following the idea of o_q, I created NavigationWindow as MainWindow and changed all the the views to page.
Then, I created an inteface and a class which using Navigation:
public interface INavigationService
{
event NavigatingCancelEventHandler Navigating;
void NavigateTo(Uri pageUri);
void GoBack();
}
public class NavigationService : INavigationService
{
private NavigationWindow _mainFrame;
#region Implementation of INavigationService
public event NavigatingCancelEventHandler Navigating;
public void NavigateTo(Uri pageUri)
{
if (EnsureMainFrame())
{
_mainFrame.Navigate(pageUri);
}
}
public void GoBack()
{
if (EnsureMainFrame()
&& _mainFrame.CanGoBack)
{
_mainFrame.GoBack();
}
}
#endregion
private bool EnsureMainFrame()
{
if (_mainFrame != null)
{
return true;
}
_mainFrame = System.Windows.Application.Current.MainWindow as NavigationWindow;
if (_mainFrame != null)
{
// Could be null if the app runs inside a design tool
_mainFrame.Navigating += (s, e) =>
{
if (Navigating != null)
{
Navigating(s, e);
}
};
return true;
}
return false;
}
}
Then, in viewModelLocator I created all the const string nedded to store the paths to my views:
public class ViewModelLocator
{
#region Views Paths
public const string FrontendViewPath = "../Views/FrontendView.xaml";
public const string BackendViewPath = "../Views/BackendView.xaml";
public const string StartUpViewPath = "../Views/StartUpView.xaml";
public const string LoginViewPath = "../Views/LoginView.xaml";
public const string OutOfOrderViewPath = "../Views/OutOfOrderView.xaml";
public const string OperativeViewPath = "../Views/SubViews/OperativeView.xaml";
public const string ConfigurationViewPath = "../Views/SubViews/ConfigurationView.xaml";
#endregion
In App.cs, in the Application_Startup event handler, with the help of Unity IoC I registered a singleton of NavigationService:
public partial class App : System.Windows.Application
{
private static IUnityContainer _ambientContainer;
public static IServiceLocator AmbientLocator { get; private set; }
...
private void Application_Startup(object sender, System.Windows.StartupEventArgs e)
{
_ambientContainer =
new UnityContainer();
_ambientContainer.RegisterType<INavigationService, NavigationService>(new ContainerControlledLifetimeManager());
AmbientLocator = new UnityServiceLocator(_ambientContainer);
ServiceLocator.SetLocatorProvider(() => AmbientLocator);
Now, in my ViewModelLocator, I can register a "Galasoft" message to catch all the events and navigate to a page; in the constructor I have:
public ViewModelLocator()
{
CreateMain();
CreateFrontend();
CreateBackend();
CreateStartUp();
CreateOperative();
CreateLogin();
CreateConfiguration();
CreateOutOfOrder();
// Set Sturtup Page...
ServiceLocator.Current.GetInstance<INavigationService>().NavigateTo(new Uri(StartUpViewPath, UriKind.Relative));
Messenger.Default.Register<MoveToViewMessage>(this, message =>
{
switch (message.StateInfo.StateType)
{
case StateType.StartUpState:
ServiceLocator.Current.GetInstance<INavigationService>().NavigateTo(new Uri(StartUpViewPath,UriKind.Relative));
break;
case StateType.LoginState:
ServiceLocator.Current.GetInstance<INavigationService>().NavigateTo(new Uri(LoginViewPath, UriKind.Relative));
break;
case StateType.OperativeState:
ServiceLocator.Current.GetInstance<INavigationService>().NavigateTo(new Uri(OperativeViewPath, UriKind.Relative));
break;
case StateType.ConfigurationState:
ServiceLocator.Current.GetInstance<INavigationService>().NavigateTo(new Uri(ConfigurationViewPath, UriKind.Relative));
break;
case StateType.ClosedState:
case StateType.OutOfOrderState:
ServiceLocator.Current.GetInstance<INavigationService>().NavigateTo(new Uri(OutOfOrderViewPath, UriKind.Relative));
break;
default:
ServiceLocator.Current.GetInstance<INavigationService>().NavigateTo(new Uri(StartUpViewPath, UriKind.Relative));
break;
}
});
}
In this way I keep all the viewModels "ignorant"... they don't know anything about navigation, plus I don't have code behind.
If I need to navigate by using a button from a view I can resolve NavigationService from the connected viewModel and navigate to the Page I need.
And, most important thing, it works!
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