更新 ViewModel 中的属性后出现 NotImplementedException 0x80004001

Question

上下文是 Windows Phone 7 的 Silverlight 应用程序。我正在使用模拟器进行调试。

我有一个 MainPage.xaml，其 DataContext 中附加了一个 ViewModel。
当页面NavigedTo时，会调用ViewModel中的方法来调用API并显示信息。

我有一个方法，它创建一个 Dictionary，用数据填充它并将其设置在实现 PropertyChanged 事件的属性中。

调用此方法后，调试器会在 App.Application_UnhandledException 中中断并出现 NotImplementedException。

如果我使用调试器跳过对此方法的调用，则不会引发异常。

奇怪的是，异常是在调用方法之后引发的，而不是在方法内部引发的！该异常不包含 InnerException。 HResult 为 -2147467263 以及一条包含“0x80004001”的消息。这是 StackTrace：

at MS.Internal.XcpImports.CheckHResult(UInt32 hr)
at MS.Internal.XcpImports.FrameworkElement_MeasureOverride(FrameworkElement element, Size availableSize)
at System.Windows.FrameworkElement.MeasureOverride(Size availableSize)
at System.Windows.FrameworkElement.MeasureOverride(IntPtr nativeTarget, Single inWidth, Single inHeight, Single& outWidth, Single& outHeight)
at MS.Internal.XcpImports.MeasureNative(IntPtr element, Single inWidth, Single inHeight)
at MS.Internal.XcpImports.UIElement_Measure(UIElement element, Size availableSize)
at System.Windows.UIElement.Measure(Size availableSize)
at Microsoft.Phone.Controls.Primitives.PanoramaPanel.MeasureOverride(Size availableSize)
at System.Windows.FrameworkElement.MeasureOverride(IntPtr nativeTarget, Single inWidth, Single inHeight, Single& outWidth, Single& outHeight)
at MS.Internal.XcpImports.MeasureOverrideNative(IntPtr element, Single inWidth, Single inHeight, Single& outWidth, Single& outHeight)
at MS.Internal.XcpImports.FrameworkElement_MeasureOverride(FrameworkElement element, Size availableSize)
at System.Windows.FrameworkElement.MeasureOverride(Size availableSize)
at System.Windows.FrameworkElement.MeasureOverride(IntPtr nativeTarget, Single inWidth, Single inHeight, Single& outWidth, Single& outHeight)
at MS.Internal.XcpImports.MeasureOverrideNative(IntPtr element, Single inWidth, Single inHeight, Single& outWidth, Single& outHeight)
at MS.Internal.XcpImports.FrameworkElement_MeasureOverride(FrameworkElement element, Size availableSize)
at System.Windows.FrameworkElement.MeasureOverride(Size availableSize)
at Microsoft.Phone.Controls.Panorama.MeasureOverride(Size availableSize)
at System.Windows.FrameworkElement.MeasureOverride(IntPtr nativeTarget, Single inWidth, Single inHeight, Single& outWidth, Single& outHeight)
at MS.Internal.XcpImports.MeasureOverrideNative(IntPtr element, Single inWidth, Single inHeight, Single& outWidth, Single& outHeight)
at MS.Internal.XcpImports.FrameworkElement_MeasureOverride(FrameworkElement element, Size availableSize)
at System.Windows.FrameworkElement.MeasureOverride(Size availableSize)
at System.Windows.FrameworkElement.MeasureOverride(IntPtr nativeTarget, Single inWidth, Single inHeight, Single& outWidth, Single& outHeight)
at MS.Internal.XcpImports.MeasureOverrideNative(IntPtr element, Single inWidth, Single inHeight, Single& outWidth, Single& outHeight)
at MS.Internal.XcpImports.FrameworkElement_MeasureOverride(FrameworkElement element, Size availableSize)
at System.Windows.FrameworkElement.MeasureOverride(Size availableSize)
at Microsoft.Phone.Controls.PhoneApplicationFrame.MeasureOverride(Size availableSize)
at System.Windows.FrameworkElement.MeasureOverride(IntPtr nativeTarget, Single inWidth, Single inHeight, Single& outWidth, Single& outHeight)

调试输出包含：

A first chance exception of type 'System.ArgumentNullException' occurred in mscorlib.dll (x10)
A first chance exception of type 'System.NotImplementedException' occurred in System.Windows.dll (x6)

Answer 1

哦哦。我通过检查 XAML 端的数据绑定发现了用户错误。这是我的 XAML：

<TextBlock Grid.Column="0" Text="{Binding Value}"
           Style="PhoneTextLargeStyle" />
<TextBlock Grid.Column="1" Text="{Binding Key}"
           Style="PhoneTextLargeStyle" />

我忘了写它是静态资源：

<TextBlock Grid.Column="0" Text="{Binding Value}"
           Style="{StaticResource PhoneTextLargeStyle}" />
<TextBlock Grid.Column="1" Text="{Binding Key}"
           Style="{StaticResource PhoneTextLargeStyle}" />

希望这个愚蠢的问题/自动回答能帮助某人:)