Xamarin.Forms 和 Caliburn.Micro 的 WinPhone 8.1 项目无法创建视图

Question

我有一个 Xamarin.Forms 项目和一个使用 Caliburn.Micro.

的 WinPhone 8.1 项目

这是我的 App.xaml:

<caliburn:CaliburnApplication x:Class="MyProject.WinPhone.App"
                          xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                          xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                          xmlns:caliburn="using:Caliburn.Micro"
                          xmlns:local="using:MyProject.WinPhone" />

这是我的 App.xaml.cs:

public sealed partial class App : Caliburn.Micro.CaliburnApplication
{

private WinRTContainer container;

private TransitionCollection transitions;

public App()
{
  InitializeComponent();
}

protected override void Configure()
{
  container = new WinRTContainer();
  container.RegisterWinRTServices();

  //TODO: Register your view models at the container
  container.PerRequest<MainViewModel>();
}

protected override object GetInstance(Type service, string key)
{
  var instance = container.GetInstance(service, key);
  if (instance != null)
    return instance;
  throw new Exception("Could not locate any instances.");
}

protected override IEnumerable<object> GetAllInstances(Type service)
{
  return container.GetAllInstances(service);
}

protected override void BuildUp(object instance)
{
  container.BuildUp(instance);
}

protected override void PrepareViewFirst(Frame rootFrame)
{
  container.RegisterNavigationService(rootFrame);
}

protected override IEnumerable<Assembly> SelectAssemblies()
{
  return new[] { typeof(MainViewModel).GetTypeInfo().Assembly, typeof(Windows.Foundation.AsyncActionCompletedHandler).GetTypeInfo().Assembly };
}

protected override void OnLaunched(LaunchActivatedEventArgs args)
{
  if (args.PreviousExecutionState == ApplicationExecutionState.Running)
    return;

  try
  {
    DisplayRootView<MainView>();
    //DisplayRootView<MainPage>();
    //DisplayRootViewFor<MainViewModel>();
  }
  catch (Exception ex)
  {
    var x = 8;
    throw;
  }
}

}

这些是 NuGet 包：

它可以编译，但是当我尝试运行它时，我在 DisplayRootView 处得到以下异常：

Could not find Windows Runtime type 'Windows.Foundation'.":"Windows.Foundation

   at System.StubHelpers.WinRTTypeNameConverter.GetTypeFromWinRTTypeName(String typeName, Boolean& isPrimitive)
   at System.StubHelpers.SystemTypeMarshaler.ConvertToManaged(TypeNameNative* pNativeType, Type& managedType)
   at Windows.UI.Xaml.Controls.Frame.Navigate(Type sourcePageType, Object parameter)
   at Caliburn.Micro.CaliburnApplication.DisplayRootView(Type viewType, Object paramter)
   at Caliburn.Micro.CaliburnApplication.DisplayRootView[T](Object parameter)
   at MyProject.WinPhone.App.OnLaunched(LaunchActivatedEventArgs args)

你能告诉我我应该怎么做吗？

更新：

问题的根源在于这部分代码：

  private global::MyProject.WinPhone.MyProject_WinPhone_XamlTypeInfo.XamlTypeInfoProvider _provider;

    public global::Windows.UI.Xaml.Markup.IXamlType GetXamlType(global::System.Type type)
    {
        if(_provider == null)
        {
            _provider = new global::MyProject.WinPhone.MyProject_WinPhone_XamlTypeInfo.XamlTypeInfoProvider();
        }
        return _provider.GetXamlTypeByType(type);
    }

    public global::Windows.UI.Xaml.Markup.IXamlType GetXamlType(string fullName)
    {
        if(_provider == null)
        {
            _provider = new global::MyProject.WinPhone.MyProject_WinPhone_XamlTypeInfo.XamlTypeInfoProvider();
        }
        return _provider.GetXamlTypeByName(fullName);
    }

    public global::Windows.UI.Xaml.Markup.XmlnsDefinition[] GetXmlnsDefinitions()
    {
        return new global::Windows.UI.Xaml.Markup.XmlnsDefinition[0];
    }
}
}

namespace MyProject.WinPhone.MyProject_WinPhone_XamlTypeInfo
{

[System.CodeDom.Compiler.GeneratedCodeAttribute("Microsoft.Windows.UI.Xaml.Build.Tasks", "4.0.0.0")]    
internal partial class XamlTypeInfoProvider
{
    public global::Windows.UI.Xaml.Markup.IXamlType GetXamlTypeByType(global::System.Type type)
    {
        global::Windows.UI.Xaml.Markup.IXamlType xamlType;
        if (_xamlTypeCacheByType.TryGetValue(type, out xamlType))
        {
            return xamlType;
        }
        int typeIndex = LookupTypeIndexByType(type);
        if(typeIndex != -1)
        {
            xamlType = CreateXamlType(typeIndex);
        }
        var userXamlType = xamlType as global::MyProject.WinPhone.MyProject_WinPhone_XamlTypeInfo.XamlUserType;
        if(xamlType == null || (userXamlType != null && userXamlType.IsReturnTypeStub && !userXamlType.IsLocalType))
        {
            global::Windows.UI.Xaml.Markup.IXamlType libXamlType = CheckOtherMetadataProvidersForType(type);
            if (libXamlType != null)
            {
                if(libXamlType.IsConstructible || xamlType == null)
                {
                    xamlType = libXamlType;
                }
            }
        }
        if (xamlType != null)
        {
            _xamlTypeCacheByName.Add(xamlType.FullName, xamlType);
            _xamlTypeCacheByType.Add(xamlType.UnderlyingType, xamlType);
        }
        return xamlType;
    }

似乎我传入的 MainView 无法转换为合适的 XAML 类型，因为 GetXamlTypeByType returns null.

我好像 Xamarin.Forms 视图与 WinPhone 世界不兼容...好吧，如果我没记错的话，Xamarin.Forms 应该是关于抽象视图的。

我现在该怎么办？

Answer 1

在我仔细阅读 Xamarin Forms tutorial 如何添加 Windows Phone 8.1 应用程序并进行相应修改后，一切都按预期工作。

在我的例子中，MainPage.xaml.cs有它的原始代码，因为我没有根据教程更改它。

public sealed partial class MainPage  // REMOVE ": PhonePage"

由于 Caliburn.Micro 使用 Xamarin 基础结构，因此需要执行这些步骤。

Xamarin.Forms 和 Caliburn.Micro 的 WinPhone 8.1 项目无法创建视图

WinPhone 8.1 project with Xamarin.Forms and Caliburn.Micro failes to create view

c#

caliburn.micro

xamarin.forms

xamarin.winphone