Comment attraper SqlException dans LINQ to SQL

Question

Dans mon application WPF, j'utilise LINQ to SQL, quand je l'appelle SubmitChanges(), il lève une exception, mais je suis incapable de l'attraper.

Voici le code correspondant:

try
{
    FeatureDataContext.Features.InsertOnSubmit(newFeature);
    FeatureDataContext.SubmitChanges();
}
catch (SqlException sqlEx)
{
    System.Windows.MessageBox.Show("CreateNewFeature : " + sqlEx.Message);
}

Et c'est l'exception qui la jette ci-dessus:

Exception Info: System.Data.SqlClient.SqlException
Stack:
   at System.Data.Linq.DataContext.SubmitChanges(System.Data.Linq.ConflictMode)
   at System.Data.Linq.DataContext.SubmitChanges()
   at [....]

Comment attraper le SqlException en application WPF?

J'ai vu que SubmitChanges() ne jette pas une exception. Mais le code qui a soulevé des points d'exception à est le code qui appelle SubmitChanges().

---

EDIT:

L'exception complète est la suivante:

Application: CompositeApplicationLauncher.exe
Framework Version: v4.0.30319
Description: The process was terminated due to an unhandled exception.
Exception Info: System.Data.SqlClient.SqlException
Stack:
   at System.Data.Linq.DataContext.SubmitChanges(System.Data.Linq.ConflictMode)
   at System.Data.Linq.DataContext.SubmitChanges()
   at Runaware.Wpf.CompositeApplication.SessionReviewer.SessionDataProvider.CreateNewCategory(Runaware.InsightAnalysis.ApplicationFeatures.ObjectModel.ApplicationInfo)
   at Microsoft.Practices.Composite.Presentation.Commands.DelegateCommand`1[[System.__Canon, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]].Execute(System.__Canon)
   at Microsoft.Practices.Composite.Presentation.Commands.DelegateCommand`1[[System.__Canon, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]].System.Windows.Input.ICommand.Execute(System.Object)
   at Runaware.Wpf.CompositeApplication.Commands.DelegateExecute.ExecuteCaller(System.Object, System.Windows.RoutedEventArgs)
   at System.Windows.RoutedEventHandlerInfo.InvokeHandler(System.Object, System.Windows.RoutedEventArgs)
   at System.Windows.EventRoute.InvokeHandlersImpl(System.Object, System.Windows.RoutedEventArgs, Boolean)
   at System.Windows.UIElement.RaiseEventImpl(System.Windows.DependencyObject, System.Windows.RoutedEventArgs)
   at System.Windows.UIElement.RaiseEvent(System.Windows.RoutedEventArgs)
   at System.Windows.Controls.MenuItem.InvokeClickAfterRender(System.Object)
   at System.Windows.Threading.ExceptionWrapper.InternalRealCall(System.Delegate, System.Object, Int32)
   at MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(System.Object, System.Delegate, System.Object, Int32, System.Delegate)
   at System.Windows.Threading.DispatcherOperation.InvokeImpl()
   at System.Windows.Threading.DispatcherOperation.InvokeInSecurityContext(System.Object)
   at System.Threading.ExecutionContext.runTryCode(System.Object)
   at System.Runtime.CompilerServices.RuntimeHelpers.ExecuteCodeWithGuaranteedCleanup(TryCode, CleanupCode, System.Object)
   at System.Threading.ExecutionContext.RunInternal(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object)
   at System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object, Boolean)
   at System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object)
   at System.Windows.Threading.DispatcherOperation.Invoke()
   at System.Windows.Threading.Dispatcher.ProcessQueue()
   at System.Windows.Threading.Dispatcher.WndProcHook(IntPtr, Int32, IntPtr, IntPtr, Boolean ByRef)
   at MS.Win32.HwndWrapper.WndProc(IntPtr, Int32, IntPtr, IntPtr, Boolean ByRef)
   at MS.Win32.HwndSubclass.DispatcherCallbackOperation(System.Object)
   at System.Windows.Threading.ExceptionWrapper.InternalRealCall(System.Delegate, System.Object, Int32)
   at MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(System.Object, System.Delegate, System.Object, Int32, System.Delegate)
   at System.Windows.Threading.Dispatcher.InvokeImpl(System.Windows.Threading.DispatcherPriority, System.TimeSpan, System.Delegate, System.Object, Int32)
   at MS.Win32.HwndSubclass.SubclassWndProc(IntPtr, Int32, IntPtr, IntPtr)
   at MS.Win32.UnsafeNativeMethods.DispatchMessage(System.Windows.Interop.MSG ByRef)
   at System.Windows.Threading.Dispatcher.PushFrameImpl(System.Windows.Threading.DispatcherFrame)
   at System.Windows.Threading.Dispatcher.PushFrame(System.Windows.Threading.DispatcherFrame)
   at System.Windows.Threading.Dispatcher.Run()
   at System.Windows.Application.RunDispatcher(System.Object)
   at System.Windows.Application.RunInternal(System.Windows.Window)
   at System.Windows.Application.Run(System.Windows.Window)
   at System.Windows.Application.Run()
   at Runware.Wpf.CompositeApplication.App.Main()

Answer 1

Si l'est en fait SqlException, alors il doit être pris méthode et le type de l'exception étant jeté le bloc que vous avez fourni est à l'intérieur du CreateNewCategory (regardant le stacktrace) try-catch.

Par ailleurs, si vous voulez attraper toutes les exceptions dans les applications, vous devez vous abonner à l'événement Application.DispatcherUnhandledException des exceptions dans le thread d'interface utilisateur et AppDomain.CurrentDomain.UnhandledException des exceptions dans d'autres threads.