我在调用{DataContext}.SubmitChanges()时遇到了stackoverflow异常...我希望我知道要发布哪些代码行以帮助澄清情况，但异常在抛出它时没有提供任何信息：
An unhandled exception of type 'System.StackOverflowException' occurred in mscorlib.dll
然后在View Detail中得到：
{Cannot evaluate expression because the current thread is in a stack overflow state.}
我查看了此视图模型中的所有属性，以确保所有内容都已正确声明，并且没有导致stackoverflow异常的问题......仅在调用SubmitChanges()之后才会发生。
以下是调用提交的代码：
public void VerifyAdvancePaymentsAndSave()
{
try
{
if (!VerifyTakeHomeActualBreakDownForAdvancePayments())
{
MessageBox.Show(
"Cash, Check, and Money Order fields must add up to the amount in the Take Home Actual field!",
"Validation Error!", MessageBoxButton.OK, MessageBoxImage.Exclamation);
return;
}
if (MessageBox.Show("Are you sure you want to save this payment?", "Save", MessageBoxButton.YesNo, MessageBoxImage.Question) != MessageBoxResult.Yes)
return;
if (!UserController.CreateUserController().CheckAccess(UserController.RestrictedAccessAction.EditCollections))
{
return;
}
if (InitialCollectionAction == CollectionAction.ViewAdvancePayment)
{
foreach (Advance a in Advances)
{
foreach (AdvancePayment ap in a.AdvancePayments)
{
AdvancePayment newAP = sp.AdvancePayments.Where(adv => adv.Id == ap.Id).SingleOrDefault();
if (newAP != null)
{
newAP.Payment = ap.Payment;
newAP.IsSaved = false;
}
else
{
MessageBox.Show("Could not find Advance Payment to apply amount to!");
return;
}
}
}
}
else
{
try
{
CurrentCollection.Status = BatchStatus.Open.ToString();
CurrentCollection.CollectionDate = DateTime.Now;
CurrentCollection.IsAdvancedPayment = true;
CurrentCollection.CollectionMachines = null;
//sp.Collections.InsertOnSubmit(CurrentCollection);
}
catch
{
MessageBox.Show("Error inserting changes!");
}
}
try
{
sp.SubmitChanges();
if (InitialCollectionAction == CollectionAction.ViewAdvancePayment)
MessageBox.Show("Advance Payment was saved Successfully!");
else
MessageBox.Show("Advance Payment was submitted Sucessfully!");
CloseTab();
}
catch
{
MessageBox.Show("Error submitting changes!");
}
}
catch (Exception ex)
{
string message = UserController.CreateUserController().LoggedInUser.UserName + "\n" + ex.Message + "\n" + ex.StackTrace;
EmailController.CreateEmailController().SendEmail("URM Error", message);
}
}
堆栈跟踪 - 在SubmitChanges（）调用之前
at URM.ViewModels.CollectionsViewModel.VerifyAdvancePaymentsAndSave()
at URM.Commands.CollectionsSaveCommand.Execute(Object parameter)
at MS.Internal.Commands.CommandHelpers.CriticalExecuteCommandSource(ICommandSource commandSource, Boolean userInitiated)
at System.Windows.Controls.Primitives.ButtonBase.OnClick()
at System.Windows.Controls.Button.OnClick()
at System.Windows.Controls.Primitives.ButtonBase.OnMouseLeftButtonUp(MouseButtonEventArgs e)
at System.Windows.UIElement.OnMouseLeftButtonUpThunk(Object sender, MouseButtonEventArgs e)
at System.Windows.Input.MouseButtonEventArgs.InvokeEventHandler(Delegate genericHandler, Object genericTarget)
at System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)
at System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs)
at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
at System.Windows.UIElement.ReRaiseEventAs(DependencyObject sender, RoutedEventArgs args, RoutedEvent newEvent)
at System.Windows.UIElement.OnMouseUpThunk(Object sender, MouseButtonEventArgs e)
at System.Windows.Input.MouseButtonEventArgs.InvokeEventHandler(Delegate genericHandler, Object genericTarget)
at System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)
at System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs)
at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
at System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args)
at System.Windows.UIElement.RaiseTrustedEvent(RoutedEventArgs args)
at System.Windows.UIElement.RaiseEvent(RoutedEventArgs args, Boolean trusted)
at System.Windows.Input.InputManager.ProcessStagingArea()
at System.Windows.Input.InputManager.ProcessInput(InputEventArgs input)
at System.Windows.Input.InputProviderSite.ReportInput(InputReport inputReport)
at System.Windows.Interop.HwndMouseInputProvider.ReportInput(IntPtr hwnd, InputMode mode, Int32 timestamp, RawMouseActions actions, Int32 x, Int32 y, Int32 wheel)
at System.Windows.Interop.HwndMouseInputProvider.FilterMessage(IntPtr hwnd, WindowMessage msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
at System.Windows.Interop.HwndSource.InputFilterMessage(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
at MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
at MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o)
at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
at MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler)
at System.Windows.Threading.Dispatcher.LegacyInvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Int32 numArgs)
at MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam)
at MS.Win32.UnsafeNativeMethods.DispatchMessage(MSG& msg)
at System.Windows.Threading.Dispatcher.PushFrameImpl(DispatcherFrame frame)
at System.Windows.Threading.Dispatcher.PushFrame(DispatcherFrame frame)
at System.Windows.Threading.Dispatcher.Run()
at System.Windows.Application.RunDispatcher(Object ignore)
at System.Windows.Application.RunInternal(Window window)
at System.Windows.Application.Run(Window window)
at System.Windows.Application.Run()
at URM.App.Main()
at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)
at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Threading.ThreadHelper.ThreadStart()
此视图模型中使用的模型：
public class AdvancePaymentsModel : INotifyPropertyChanged
{
public int AdvanceId { get; set; }
public string PaymentId { get; set; }
public decimal Payment { get; set; }
public DateTime PaymentDate { get; set; }
private string _status;
public string Status
{
get
{
return _status;
}
set
{
_status = value;
OnPropertyChanged("Status");
}
}
private Brush _brushObj;
public Brush BrushObj
{
get
{
return _brushObj;
}
set
{
_brushObj = value;
OnPropertyChanged("BrushObj");
}
}
private AdvancePayment _advancePayment;
public AdvancePayment AdvancePayment
{
get
{
return _advancePayment;
}
set
{
_advancePayment = value;
OnPropertyChanged("AdvancePayment");
}
}
private Visibility _voidButtonVisibility;
public Visibility VoidButtonVisibility
{
get
{
return _voidButtonVisibility;
}
set
{
_voidButtonVisibility = value;
OnPropertyChanged("VoidButtonVisibility");
}
}
}
public class AdvancePaymentsModel : INotifyPropertyChanged
{
public int AdvanceId { get; set; }
public string PaymentId { get; set; }
public decimal Payment { get; set; }
public DateTime PaymentDate { get; set; }
private string _status;
public string Status
{
get
{
return _status;
}
set
{
_status = value;
OnPropertyChanged("Status");
}
}
private Brush _brushObj;
public Brush BrushObj
{
get
{
return _brushObj;
}
set
{
_brushObj = value;
OnPropertyChanged("BrushObj");
}
}
private AdvancePayment _advancePayment;
public AdvancePayment AdvancePayment
{
get
{
return _advancePayment;
}
set
{
_advancePayment = value;
OnPropertyChanged("AdvancePayment");
}
}
private Visibility _voidButtonVisibility;
public Visibility VoidButtonVisibility
{
get
{
return _voidButtonVisibility;
}
set
{
_voidButtonVisibility = value;
OnPropertyChanged("VoidButtonVisibility");
}
}
}
}
启用调试.Net Framework源代码后...我看到在调度程序类中抛出了stackoverflow异常
private void PushFrameImpl(DispatcherFrame frame)
{
SynchronizationContext oldSyncContext = null;
SynchronizationContext newSyncContext = null;
MSG msg = new MSG();
_frameDepth++;
try
{
// Change the CLR SynchronizationContext to be compatable with our Dispatcher.
oldSyncContext = SynchronizationContext.Current;
newSyncContext = new DispatcherSynchronizationContext(this);
SynchronizationContext.SetSynchronizationContext(newSyncContext);
try
{
while(frame.Continue)
{
if (!GetMessage(ref msg, IntPtr.Zero, 0, 0))
break;
TranslateAndDispatchMessage(ref msg); //*<--------- gets thrown here*
}
// If this was the last frame to exit after a quit, we
// can now dispose the dispatcher.
if(_frameDepth == 1)
{
if(_hasShutdownStarted)
{
ShutdownImpl();
}
}
}
finally
{
// Restore the old SynchronizationContext.
SynchronizationContext.SetSynchronizationContext(oldSyncContext);
}
}
finally
{
_frameDepth--;
if(_frameDepth == 0)
{
// We have exited all frames.
_exitAllFrames = false;
}
}
}
在调度程序崩溃后，这里是堆栈跟踪：
[Managed to Native Transition]
WindowsBase.dll!System.Windows.Threading.Dispatcher.PushFrameImpl(System.Windows.Threading.DispatcherFrame frame) Line 2281 + 0x35 bytes Unknown
WindowsBase.dll!System.Windows.Threading.Dispatcher.PushFrame(System.Windows.Threading.DispatcherFrame frame) Line 368 + 0x9 bytes Unknown
WindowsBase.dll!System.Windows.Threading.Dispatcher.Run() Line 327 + 0x34 bytes Unknown
> PresentationFramework.dll!System.Windows.Application.RunDispatcher(object ignore) Line 2745 C#
PresentationFramework.dll!System.Windows.Application.RunInternal(System.Windows.Window window) Line 1841 C#
PresentationFramework.dll!System.Windows.Application.Run(System.Windows.Window window) Line 261 + 0x9 bytes C#
PresentationFramework.dll!System.Windows.Application.Run() Line 222 + 0x15 bytes C#
URM.exe!URM.App.Main() + 0x59 bytes C#
[Native to Managed Transition]
[Managed to Native Transition]
mscorlib.dll!System.AppDomain.ExecuteAssembly(string assemblyFile, System.Security.Policy.Evidence assemblySecurity, string[] args) + 0x6b bytes
Microsoft.VisualStudio.HostingProcess.Utilities.dll!Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly() + 0x27 bytes
mscorlib.dll!System.Threading.ThreadHelper.ThreadStart_Context(object state) + 0x6f bytes
mscorlib.dll!System.Threading.ExecutionContext.RunInternal(System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, object state, bool preserveSyncCtx) + 0xa7 bytes
mscorlib.dll!System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, object state, bool preserveSyncCtx) + 0x16 bytes
mscorlib.dll!System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, object state) + 0x41 bytes
mscorlib.dll!System.Threading.ThreadHelper.ThreadStart() + 0x44 bytes
[Native to Managed Transition]
所以在听完@KellyGendron和@David的建议后，我最终得到了在ChangeTracker类中抛出的stackoverflow异常
internal override bool IsMemberPendingGeneration(MetaDataMember keyMember) {
if (this.IsNew && keyMember.IsDbGenerated) {
return true;
}
// look for any FK association that has this key member (should only be one)
foreach (MetaAssociation assoc in type.Associations) {
if (assoc.IsForeignKey) {
/*CRASHES HERE*/ int index = assoc.ThisKey.IndexOf(keyMember);
if (index > -1) {
// we must have a reference to this other object to know if its side of
// the association is generated or not
object otherItem = null;
if (assoc.ThisMember.IsDeferred) {
otherItem = assoc.ThisMember.DeferredValueAccessor.GetBoxedValue(this.current);
}
else {
otherItem = assoc.ThisMember.StorageAccessor.GetBoxedValue(this.current);
}
if (otherItem != null) {
if (assoc.IsMany) {
// Can't be pending generation for a value that would have to be the same
// across many rows.
continue;
}
else {
StandardTrackedObject trackedOther = (StandardTrackedObject)this.tracker.GetTrackedObject(otherItem);
if (trackedOther != null) {
MetaDataMember otherMember = assoc.OtherKey[index];
return trackedOther.IsMemberPendingGeneration(otherMember);
}
}
}
}
}
}
return false;
}
}
}
关键成员似乎是我可以从其部分可用的属性中得到的是Location类（数据库表），它似乎卡在ID列上
答案 0 :(得分：0)
我可能会错误地阅读您的代码，但是在这个代码片段中看起来像newAP.Payment会指向自己，这可能会让串行器如此混乱。如果我误读的话，请再次原谅我，今天睡眠不足。
foreach (AdvancePayment ap in a.AdvancePayments)
{
AdvancePayment newAP = sp.AdvancePayments
.Where(adv => adv.Id == ap.Id).SingleOrDefault();
if (newAP != null)
{
newAP.Payment = ap.Payment;
...
如果不是这种情况，您可能希望尝试将保存分成多个部分，例如将关联设置为null，然后按ID指定。这里有类似的案例可能会有所帮助...... http://social.msdn.microsoft.com/Forums/silverlight/en-US/d4438aaa-a916-4335-b182-ded75f162c2d/datacontextsubmitchanges-throws-stack-overflow-exception-on-rather-simple-insert
答案 1 :(得分：0)
经过多次工作 - 最终成为一个问题，其中一个表有一个外键到它自己的主键。这导致循环引用发生。我发现调试这个的最好方法是启用.NET源代码的调试，然后我不得不在我的ViewModel中的OnPropertyChanged方法中放置一个断点。那时，我能够在ChangeaTracker类中获得异常，否则它将在Dispatcher类中中断...