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我正在编写 Windows Phone 8 应用程序并使用 MVVM light。我已将 WP8 应用程序的 ViewModel 和 Model 类写入单独的 PCL 项目。

使用 Expression Blend 时，它会正确填充设计时数据。但是当我尝试在模拟器中运行应用程序时，它会出现以下错误。你能帮我找出解决这个错误的方法吗？

A first chance exception of type 'System.Windows.Markup.XamlParseException' 
occurred in System.Windows.ni.dll

这是异常的详细信息。

System.Windows.Markup.XamlParseException occurred
  HResult=-2146233087
  Message=Cannot create instance of type 'MyPkg.Commons.ViewModel.ViewModelLocator' [Line: 12 Position: 61]
  Source=System.Windows
  LineNumber=12
  LinePosition=61
  StackTrace:
       at System.Windows.Application.LoadComponent(Object component, Uri resourceLocator)
       at MyPkg.WindowsPhone8.App.InitializeComponent()
       at MyPkg.WindowsPhone8.App..ctor()
  InnerException: System.TypeInitializationException
       HResult=-2146233036
       Message=The type initializer for 'MyPkg.Commons.ViewModel.ViewModelLocator' threw an exception.
       Source=mscorlib
       TypeName=MyPkg.Commons.ViewModel.ViewModelLocator
       StackTrace:
            at System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor)
            at System.Reflection.RuntimeConstructorInfo.Invoke(BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
            at MS.Internal.TypeProxy.<>c__DisplayClass32.<GetCreateObjectDelegate>b__2c()
            at MS.Internal.TypeProxy.CreateInstance(UInt32 customTypeId)
            at MS.Internal.XamlManagedRuntimeRPInvokes.CreateInstance(XamlTypeToken inXamlType, XamlQualifiedObject& newObject)
       InnerException: System.IO.FileLoadException
            HResult=-2146234304
            Message=Could not load file or assembly 'Microsoft.Practices.ServiceLocation, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)
            Source=MyPkg.Commons
            StackTrace:
                 at MyPkg.Commons.ViewModel.ViewModelLocator..cctor()
            InnerException:

下面是 App.xaml

<Application xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:phone="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone"
             xmlns:shell="clr-namespace:Microsoft.Phone.Shell;assembly=Microsoft.Phone"
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
             xmlns:vm="clr-namespace:MyPkg.Commons.ViewModel;assembly=MyPkg.Commons"
             mc:Ignorable="d" x:Class="MyPkg.WindowsPhone8.App">
  <!--Application Resources-->
  <Application.Resources>
    <local:LocalizedStrings xmlns:local="clr-namespace:MyPkg.WindowsPhone8" x:Key="LocalizedStrings" />
        <vm:ViewModelLocator x:Key="Locator" d:IsDataSource="True"  />
  </Application.Resources>
  <Application.ApplicationLifetimeObjects>
    <!--Required object that handles lifetime events for the application-->
    <shell:PhoneApplicationService Launching="Application_Launching" Closing="Application_Closing" Activated="Application_Activated" Deactivated="Application_Deactivated" />
  </Application.ApplicationLifetimeObjects>
</Application>

下面是 ViewModelLocator 的代码构造函数

   static ViewModelLocator()
    {
        ServiceLocator.SetLocatorProvider(() => SimpleIoc.Default);

        if (ViewModelBase.IsInDesignModeStatic)
        {
            // Create design time view services and models
            SimpleIoc.Default.Register<IAlaramService, MyPkg.Commons.Design.AlaramService>();
        }
        else
        {
            // Create run time view services and models
            SimpleIoc.Default.Register<IAlaramService, MyPkg.Commons.Design.AlaramService>();
        }

        SimpleIoc.Default.Register<MainViewModel>();
    }
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1 回答 1

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您对 Microsoft.Practices.ServiceLocation 程序集的引用似乎存在问题。打开项目的 References 文件夹，右键单击 Microsoft.Practices.ServiceLocation，然后选择属性。确保 Path 引用的文件存在并且 Copy Local 设置为 True，然后重新构建应用程序。如果此错误仍然存​​在，请移除 MVVM Light 库并将其重新添加到您的项目中。

于 2013-09-24T21:45:55.410 回答