Question

我的程序似乎有一个错误，我发现很难找到。该程序是多线程的，非常复杂。简而言之，它使用异步套接字与多个客户端通信并写入数据库。

当我通过客户端通信锤击程序并按住回车键以将垃圾邮件写入数据库时，抛出System.Reflection.TargetInvocationException。在某个时间点抛出异常，我在主窗口的构造函数中捕获以下代码片段：

    VMMainWindow()
    {
         ...
         System.Windows.Threading.Dispatcher.CurrentDispatcher.UnhandledException += new System.Windows.Threading.DispatcherUnhandledExceptionEventHandler(CurrentDispatcher_UnhandledException);
         ....
    }

    static void CurrentDispatcher_UnhandledException(object sender, System.Windows.Threading.DispatcherUnhandledExceptionEventArgs e)
    {
        string str = e.ToString();
    }

我没有太多工作但是我想知道是否有人可以建议一些工具或者指出我正确的方向来帮助我检测这个例外的位置。详细的例外情况粘贴在下面。

System.Reflection.TargetInvocationException was unhandled   Message=Exception has been thrown by the target of an invocation.   Source=mscorlib   StackTrace:
       at System.RuntimeMethodHandle._InvokeMethodFast(IRuntimeMethodInfo method, Object target, Object[] arguments, SignatureStruct& sig, MethodAttributes methodAttributes, RuntimeType typeOwner)
       at System.RuntimeMethodHandle.InvokeMethodFast(IRuntimeMethodInfo method, Object target, Object[] arguments, Signature sig, MethodAttributes methodAttributes, RuntimeType typeOwner)
       at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture, Boolean skipVisibilityChecks)
       at System.Delegate.DynamicInvokeImpl(Object[] args)
       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.DispatcherOperation.InvokeImpl()
       at System.Windows.Threading.DispatcherOperation.InvokeInSecurityContext(Object state)
       at System.Threading.ExecutionContext.runTryCode(Object userData)
       at System.Runtime.CompilerServices.RuntimeHelpers.ExecuteCodeWithGuaranteedCleanup(TryCode code, CleanupCode backoutCode, Object userData)
       at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
       at System.Windows.Threading.DispatcherOperation.Invoke()
       at System.Windows.Threading.Dispatcher.ProcessQueue()
       at System.Windows.Threading.Dispatcher.WndProcHook(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.InvokeImpl(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 SupernovaServer.App.Main() in D:\Projects\Supernova Server\Server\obj\x86\Debug\App.g.cs:line 0
       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.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
       at System.Threading.ThreadHelper.ThreadStart()   InnerException: System.ArgumentOutOfRangeException
       Message=Index was out of range. Must be non-negative and less than the size of the collection. Parameter name: index
       Source=mscorlib
       ParamName=index
       StackTrace:
            at System.ThrowHelper.ThrowArgumentOutOfRangeException()
            at System.Collections.Generic.List`1.get_Item(Int32 index)
            at System.Collections.ObjectModel.Collection`1.System.Collections.IList.get_Item(Int32 index)
            at System.Windows.Data.ListCollectionView.AdjustBefore(NotifyCollectionChangedAction action, Object item, Int32 index)
            at System.Windows.Data.ListCollectionView.ProcessCollectionChanged(NotifyCollectionChangedEventArgs args)
            at System.Windows.Data.CollectionView.OnCollectionChanged(Object sender, NotifyCollectionChangedEventArgs args)
       InnerException:

Answer 1

是否有多个线程可以并发访问非线程安全的集合？比方说，一个线程删除一个项目而另一个正在阅读或添加？这肯定会导致这种类型的错误。通常，.NET集合类（System.Collections.Concurrent中的那些除外）不是线程安全的。您可以拥有多个阅读器，但对集合的任何修改都需要独占访问 - 受锁或读写器锁的保护。

Answer 2

假设App.g.cs不是问题所在，这是非常安全的，正如你所说，没有太多可继续的。所以这是我对你的暗示：看一下内部异常。这些东西非常方便，而且我愿意打赌你至少有一层内部异常。

找到UnhandledException的源代码

2 个答案: