带有Datagrid的窗口上的ShowDialog（）引发Divedbyzero错误

时间：2019-02-21 17:03:11

标签： c# wpf datagrid

我发现了一个奇怪的错误，甚至找不到它的来源：

我有一个窗口，其中的DataGrid绑定到从数据集中填充的静态资源：

WPF：

<Window.Resources>
    <PDV_WPF:FDBDataSet x:Key="fDBDataSet"/>
    <CollectionViewSource x:Key="sP_TRI_LISTAFECHAMENTOSViewSource" Source="{Binding SP_TRI_LISTAFECHAMENTOS, Source={StaticResource fDBDataSet}}"/>
</Window.Resources>
...
<DataGrid x:Name="sP_TRI_LISTAFECHAMENTOSDataGrid" 
Language="pt-BR" AutoGenerateColumns="False" ItemsSource="{Binding}" 
Margin="10" Grid.Row="2" HeadersVisibility="Column" 
IsReadOnly="True" PreviewKeyDown="sP_TRI_LISTAFECHAMENTOSDataGrid_PreviewKeyDown">

但是在用户按下按钮之前不会调用填充ViewSource的方法，因此我得到的只是一个空的DataGrid。此外，在此窗口上调用ShowDialog（）也可以正常工作。

当用户浏览导航框中显示的一系列页面时，就会出现此问题，而导航框又位于另一个窗口中。这两个窗口不能同时打开。

这些页面以绑定的只读组合框，文本框和复选框的形式收集数据，并在每页末尾设置Properties.Settings.Default参数。这样的页面是：

C＃：

    public setupSpooler()
    {
        InitializeComponent();
        foreach (string printer in System.Drawing.Printing.PrinterSettings.InstalledPrinters)
        {
            cbb_printers.Items.Add(printer);
        }
    }

    private void cbb_printers_DropDownClosed(object sender, EventArgs e)
    {
        if (cbb_printers.SelectedIndex.ToString() != "-1")
        {
            Properties.Settings.Default.ImpressoraUSB = cbb_printers.SelectedItem.ToString();
            Properties.Settings.Default.Save();
            Properties.Settings.Default.Reload();
         }
    }

该问题在用户完成将设置写入设置文件后出现。尝试在上一个窗口（带有DataGrid的窗口）上运行ShowDialog（）时，它将引发一个System.DivideByZeroException，并带有以下堆栈跟踪：

   em System.Windows.Controls.VirtualizingStackPanel.MeasureOverrideImpl(Size constraint, Nullable`1& lastPageSafeOffset, List`1& previouslyMeasuredOffsets, Nullable`1& lastPagePixelSize, Boolean remeasure)
   em System.Windows.Controls.VirtualizingStackPanel.MeasureOverride(Size constraint)
   em System.Windows.Controls.Primitives.DataGridRowsPresenter.MeasureOverride(Size constraint)
   em System.Windows.FrameworkElement.MeasureCore(Size availableSize)
   em System.Windows.UIElement.Measure(Size availableSize)
   em MS.Internal.Helper.MeasureElementWithSingleChild(UIElement element, Size constraint)
   em System.Windows.Controls.ItemsPresenter.MeasureOverride(Size constraint)
   em System.Windows.FrameworkElement.MeasureCore(Size availableSize)
   em System.Windows.UIElement.Measure(Size availableSize)
   em MS.Internal.Helper.MeasureElementWithSingleChild(UIElement element, Size constraint)
   em System.Windows.Controls.ScrollContentPresenter.MeasureOverride(Size constraint)
   em System.Windows.FrameworkElement.MeasureCore(Size availableSize)
   em System.Windows.UIElement.Measure(Size availableSize)
   em System.Windows.Controls.Grid.MeasureCell(Int32 cell, Boolean forceInfinityV)
   em System.Windows.Controls.Grid.MeasureCellsGroup(Int32 cellsHead, Size referenceSize, Boolean ignoreDesiredSizeU, Boolean forceInfinityV, Boolean& hasDesiredSizeUChanged)
   em System.Windows.Controls.Grid.MeasureCellsGroup(Int32 cellsHead, Size referenceSize, Boolean ignoreDesiredSizeU, Boolean forceInfinityV)
   em System.Windows.Controls.Grid.MeasureOverride(Size constraint)
   em System.Windows.FrameworkElement.MeasureCore(Size availableSize)
   em System.Windows.UIElement.Measure(Size availableSize)
   em System.Windows.Controls.ScrollViewer.MeasureOverride(Size constraint)
   em System.Windows.FrameworkElement.MeasureCore(Size availableSize)
   em System.Windows.UIElement.Measure(Size availableSize)
   em System.Windows.Controls.Border.MeasureOverride(Size constraint)
   em System.Windows.FrameworkElement.MeasureCore(Size availableSize)
   em System.Windows.UIElement.Measure(Size availableSize)
   em System.Windows.Controls.Control.MeasureOverride(Size constraint)
   em System.Windows.Controls.DataGrid.MeasureOverride(Size availableSize)
   em System.Windows.FrameworkElement.MeasureCore(Size availableSize)
   em System.Windows.UIElement.Measure(Size availableSize)
   em System.Windows.Controls.Grid.MeasureCell(Int32 cell, Boolean forceInfinityV)
   em System.Windows.Controls.Grid.MeasureCellsGroup(Int32 cellsHead, Size referenceSize, Boolean ignoreDesiredSizeU, Boolean forceInfinityV, Boolean& hasDesiredSizeUChanged)
   em System.Windows.Controls.Grid.MeasureCellsGroup(Int32 cellsHead, Size referenceSize, Boolean ignoreDesiredSizeU, Boolean forceInfinityV)
   em System.Windows.Controls.Grid.MeasureOverride(Size constraint)
   em System.Windows.FrameworkElement.MeasureCore(Size availableSize)
   em System.Windows.UIElement.Measure(Size availableSize)
   em System.Windows.Controls.Grid.MeasureCell(Int32 cell, Boolean forceInfinityV)
   em System.Windows.Controls.Grid.MeasureCellsGroup(Int32 cellsHead, Size referenceSize, Boolean ignoreDesiredSizeU, Boolean forceInfinityV, Boolean& hasDesiredSizeUChanged)
   em System.Windows.Controls.Grid.MeasureCellsGroup(Int32 cellsHead, Size referenceSize, Boolean ignoreDesiredSizeU, Boolean forceInfinityV)
   em System.Windows.Controls.Grid.MeasureOverride(Size constraint)
   em System.Windows.FrameworkElement.MeasureCore(Size availableSize)
   em System.Windows.UIElement.Measure(Size availableSize)
   em System.Windows.Controls.Border.MeasureOverride(Size constraint)
   em System.Windows.FrameworkElement.MeasureCore(Size availableSize)
   em System.Windows.UIElement.Measure(Size availableSize)
   em System.Windows.Controls.Border.MeasureOverride(Size constraint)
   em System.Windows.FrameworkElement.MeasureCore(Size availableSize)
   em System.Windows.UIElement.Measure(Size availableSize)
   em MS.Internal.Helper.MeasureElementWithSingleChild(UIElement element, Size constraint)
   em System.Windows.Controls.ContentPresenter.MeasureOverride(Size constraint)
   em System.Windows.FrameworkElement.MeasureCore(Size availableSize)
   em System.Windows.UIElement.Measure(Size availableSize)
   em System.Windows.Documents.AdornerDecorator.MeasureOverride(Size constraint)
   em System.Windows.FrameworkElement.MeasureCore(Size availableSize)
   em System.Windows.UIElement.Measure(Size availableSize)
   em System.Windows.Controls.Border.MeasureOverride(Size constraint)
   em System.Windows.FrameworkElement.MeasureCore(Size availableSize)
   em System.Windows.UIElement.Measure(Size availableSize)
   em System.Windows.Window.MeasureOverrideHelper(Size constraint)
   em System.Windows.Window.MeasureOverride(Size availableSize)
   em System.Windows.FrameworkElement.MeasureCore(Size availableSize)
   em System.Windows.UIElement.Measure(Size availableSize)
   em System.Windows.Interop.HwndSource.SetLayoutSize()
   em System.Windows.Interop.HwndSource.set_RootVisualInternal(Visual value)
   em System.Windows.Interop.HwndSource.set_RootVisual(Visual value)
   em System.Windows.Window.SetRootVisual()
   em System.Windows.Window.SetRootVisualAndUpdateSTC()
   em System.Windows.Window.SetupInitialState(Double requestedTop, Double requestedLeft, Double requestedWidth, Double requestedHeight)
   em System.Windows.Window.CreateSourceWindow(Boolean duringShow)
   em System.Windows.Window.CreateSourceWindowDuringShow()
   em System.Windows.Window.SafeCreateWindowDuringShow()
   em System.Windows.Window.ShowHelper(Object booleanBox)
   em System.Windows.Window.Show()
   em System.Windows.Window.ShowDialog()
   em PDV_WPF.Telas.Caixa.<>c__DisplayClass80_0.<MainWindow_KeyDown>b__14(Object p) na M:\TrilhaWS\InfoSales\PDV_PRINCIPAL\Telas\Caixa.xaml.cs:linha 1311
   em PDV_WPF.DebounceDispatcher.<>c__DisplayClass5_0.<Debounce>b__0(Object s, EventArgs e) na M:\TrilhaWS\InfoSales\PDV_PRINCIPAL\Funcoes\PublicFunc.cs:linha 2062
   em System.Windows.Threading.DispatcherTimer.FireTick(Object unused)
   em System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
   em System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)
   em System.Windows.Threading.DispatcherOperation.InvokeImpl()
   em System.Windows.Threading.DispatcherOperation.InvokeInSecurityContext(Object state)
   em MS.Internal.CulturePreservingExecutionContext.CallbackWrapper(Object obj)
   em System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   em System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   em System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
   em MS.Internal.CulturePreservingExecutionContext.Run(CulturePreservingExecutionContext executionContext, ContextCallback callback, Object state)
   em System.Windows.Threading.DispatcherOperation.Invoke()
   em System.Windows.Threading.Dispatcher.ProcessQueue()
   em System.Windows.Threading.Dispatcher.WndProcHook(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
   em MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
   em MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o)
   em System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
   em System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)
   em System.Windows.Threading.Dispatcher.LegacyInvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Int32 numArgs)
   em MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam)
   em MS.Win32.UnsafeNativeMethods.DispatchMessage(MSG& msg)
   em System.Windows.Threading.Dispatcher.PushFrameImpl(DispatcherFrame frame)
   em System.Windows.Threading.Dispatcher.PushFrame(DispatcherFrame frame)
   em System.Windows.Application.RunDispatcher(Object ignore)
   em System.Windows.Application.RunInternal(Window window)
   em System.Windows.Application.Run(Window window)
   em System.Windows.Application.Run()
   em PDV_WPF.App.Main()

我找不到确切的被零除的，以及为什么只有在运行设置助手后才会触发此错误 ...

新项目正常显示Datagrids；在不浏览页面的情况下运行软件可以使软件正常运行；在另一台计算机上运行正常；

关于如何调试的任何提示？

编辑：找到新信息。我发现正是完全触发了异常。其中一个窗口通过string response = Marshal.PtrToStringAnsi(DllMethods.Query(31298))方法从外部C ++ dll调用方法。

DllMethods是一个与外部dll交互的类，更具体地说，所使用的方法读为：

[DllImport("dllsat.dll", CallingConvention = CallingConvention.StdCall)]
public static extern IntPtr Query(int sessionNo);

调用Marshal方法后，每当要呈现数据网格时，ShowDialog()方法都会引发System.DivideByZeroException。

第二编辑：我发现为什么为什么。 DllImport首先在SysWOW64文件夹中查找dllsat.dll，该文件的版本错误且旧。当我从SysWOW64中删除该文件，并强制生成操作“总是复制”正确版本的dll时，它运行正常。

我应该将其发布为我自己问题的答案吗？

1 个答案:

答案 0 :(得分：0)

我已经找到了为什么出现此错误的原因。 DllImport首先在SysWOW64文件夹中查找dllsat.dll，该文件的版本错误且旧。当我从SysWOW64中删除该文件，并强制生成操作“总是复制”正确版本的dll时，它运行正常。

按照斯特芬的建议在此处张贴答案。

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