Question

我无法弄清楚我的应用程序中发生的异常。

基本上，我正在托管一个wpf用户控件，其中包含一个infragistics XamDataGrid。

当我关闭应用程序时，我得到一个无限循环的类型异常：

线程''（0x24020）已退出，代码为0（0x0）。 PresentationFramework.dll中出现类型为“System.NullReferenceException”的第一次机会异常 PresentationFramework.dll中出现类型为“System.NullReferenceException”的第一次机会异常 PresentationFramework.dll中发生了'System.NullReferenceException'类型的第一次机会异常等等....

如果我删除XAMDATAGRID，一切正常......所以我猜测它与网格有问题......

堆栈跟踪的一部分是:(我不确定这是否有用：）

----------------------------------------------- -------------------------------------------- PresentationFramework.dll！System。 Windows.DeferredAppResourceReference.GetValue（System.Windows.BaseValueSourceInternal valueSource = Inherited）+ 0x4d bytes

WindowsBase.dll！System.Windows.DependencyObject.GetEffectiveValue（System.Windows.EntryIndex entryIndex = {System.Windows.EntryIndex}，System.Windows.DependencyProperty dp = {System.Windows.DependencyProperty}，System.Windows.RequestFlags请求）+ 0xe6字节

WindowsBase.dll！System.Windows.DependencyObject.GetValueEntry（System.Windows.EntryIndex entryIndex，System.Windows.DependencyProperty dp = {System.Windows.DependencyProperty}，System.Windows.PropertyMetadata metadata = {System.Windows.FrameworkPropertyMetadata ，System.Windows.RequestFlags requests = FullyResolved）+ 0x2fe bytes

WindowsBase.dll！System.Windows.DependencyObject.GetValue（System.Windows.DependencyProperty dp）+ 0x48 bytes     PresentationFramework.dll！MS.Internal.Text.TextProperties.InitCommon（System.Windows.DependencyObject target = {System.Windows.Controls.TextBlock}）+ 0x6b bytes     PresentationFramework.dll！MS.Internal.Text.TextProperties.TextProperties（System.Windows.FrameworkElement target = {System.Windows.Controls.TextBlock}，bool isTypographyDefaultValue = true）+ 0x42 bytes
    PresentationFramework.dll！System.Windows.Controls.TextBlock.GetLineProperties（）+ 0x37 bytes
    PresentationFramework.dll！System.Windows.Controls.TextBlock.EnsureTextBlockCache（）+ 0x2f bytes     PresentationFramework.dll！System.Windows.Controls.TextBlock.MeasureOverride（System.Windows.Size约束）+ 0x50字节
    PresentationFramework.dll！System.Windows.FrameworkElement.MeasureCore（System.Windows.Size availableSize）+ 0x1ee bytes
    PresentationCore.dll！System.Windows.UIElement.Measure（System.Windows.Size availableSize）+ 0x249 bytes
    PresentationFramework.dll！MS.Internal.Helper.MeasureElementWithSingleChild（System.Windows.UIElement element，System.Windows.Size约束）+ 0xfe字节
    PresentationFramework.dll！System.Windows.Controls.ContentPresenter.MeasureOverride（System.Windows.Size约束）+ 0x18字节     PresentationFramework.dll！System.Windows.FrameworkElement.MeasureCore（System.Windows.Size availableSize）+ 0x1ee bytes
    PresentationCore.dll！System.Windows.UIElement.Measure（System.Windows.Size availableSize）+ 0x249 bytes
    PresentationFramework.dll！System.Windows.Controls.Control.MeasureOverride（System.Windows.Size约束）+ 0x10c bytes     PresentationFramework.dll！System.Windows.FrameworkElement.MeasureCore（System.Windows.Size availableSize）+ 0x1ee bytes
    PresentationCore.dll！System.Windows.UIElement.Measure（System.Windows.Size availableSize）+ 0x249 bytes
    PresentationFramework.dll！System.Windows.Controls.StackPanel.MeasureOverride（System.Windows.Size约束）+ 0x187字节
    PresentationFramework.dll！System.Windows.FrameworkElement.MeasureCore（System.Windows.Size availableSize）+ 0x1ee bytes
    PresentationCore.dll！System.Windows.UIElement.Measure（System.Windows.Size availableSize）+ 0x249 bytes
    PresentationFramework.dll！System.Windows.Controls.Grid.MeasureOverride（System.Windows.Size约束）+ 0x1cf bytes

如何解决这个问题的任何帮助真的很感激！谢谢！

Answer 1

发生错误是因为当winforms应用程序关闭时，WPF调度程序线程尚未完成为事件消息刷新挂起队列。当它开始这样做时，应用程序对象已经被关闭并被淘汰。要在托管窗口关闭之前解决，只需在WPF消息循环上调用shutdown。

Application.Current.Dispatcher.InvokeShutdown()

PresentationFramework.dll中类型System.NullReference异常的第一次机会异常？

1 个答案: