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附加了一个ViewModel 当页面为NavigatedTo时，会在ViewModel中调用一个方法来调用API并显示信息。

我有一个创建Dictionary<string, string>的方法，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，调试器在App.Application_UnhandledException中以NotImplementedException中断。

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，在调用方法之后引发了异常，而不是在内部！该异常不包含InnerException。有一个-2147467263的HResult和一个包含“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

OHW。我通过检查XAML端的数据绑定找到了用户错误。这是我的XAML：

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

我忘了把它写成静态资源：

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

让我们希望这个愚蠢的问题/自动回答会帮助某人：）

在ViewModel中更新属性后，NotImplementedException 0x80004001

1 个答案: