WPF 应用程序中的线程抛出 System.OutOfMemoryException

Question

以下代码将在应用程序执行处理以显示进度时调用另一个线程windows。我们做多次就会抛出异常，比如命中超过50次。这是我们的代码 - BusyIndicatorHelper.ShowProgWindowCustomSize 从异常中抛出并将调用以下代码。

public void ShowBusyIndicatorCustomSize(string message, WindowCustom currentWindow, bool fileTransferStatus = false)
{
    _message = message;
    using (_progressWindowWaitHandle = new AutoResetEvent(false))
    {
        _transferLoadVisibility = fileTransferStatus;
        //Starts the progress window thread
        Thread newprogWindowThread = new Thread(() => ShowProgWindowCustomSize(currentWindow));  
        //new Thread(new ThreadStart(ShowProgWindowNew(height, width, left, right)));
        newprogWindowThread.SetApartmentState(ApartmentState.STA);
        newprogWindowThread.IsBackground = true;
        newprogWindowThread.Start();

        //Wait for thread to notify that it has created the window
        _progressWindowWaitHandle.WaitOne();
        _isActive = true;
    }
}

这将调用 ShowProgWindowCustomSize(currentWindow)，如下所示。

private void ShowProgWindowCustomSize(WindowCustom currentWindow)
    {
        if (_transferLoadVisibility)
        {
            //creates and shows the progress window
            progWindow = new LoadingWindow(_message);
            progWindow.Height = currentWindow.WindowHeight;
            progWindow.Width = currentWindow.WindowWidth;
            progWindow.Left = currentWindow.WindowLeft;
            progWindow.Top = currentWindow.WindowTop;
            progWindow.WindowState = currentWindow.WindowState;

            progWindow.FileTansfer();
            progWindow.Show();
        }
        else
        {
            //creates and shows the progress window
            progWindow = new LoadingWindow(_message);
            progWindow.Height = currentWindow.WindowHeight;
            progWindow.Width = currentWindow.WindowWidth;
            progWindow.Left = currentWindow.WindowLeft;
            progWindow.Top = currentWindow.WindowTop;
            progWindow.WindowState = currentWindow.WindowState;
            progWindow.Show();
        }

        //makes sure dispatcher is shut down when the window is closed
        progWindow.Closed += (s, e) => Dispatcher.CurrentDispatcher.BeginInvokeShutdown(DispatcherPriority.Background);

        //Notifies command thread the window has been created
        _progressWindowWaitHandle.Set();

        //Starts window dispatcher
        System.Windows.Threading.Dispatcher.Run();
    }

以下是抛出的outofmemory异常

Application: BioMedicalVerification.exe Framework Version: v4.0.30319 Description: The process was terminated due to an unhandled exception. Exception Info: System.OutOfMemoryException Stack: at System.Windows.Media.Composition.DUCE+Channel.SyncFlush() at System.Windows.Media.MediaContext.CompleteRender() at System.Windows.Interop.HwndTarget.OnResize() at System.Windows.Interop.HwndTarget.HandleMessage (MS.Internal.Interop.WindowMessage, IntPtr, IntPtr) at System.Windows.Interop.HwndSource.HwndTargetFilterMessage (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 System.Windows.Threading.ExceptionWrapper.TryCatchWhen (System.Object, System.Delegate, System.Object, Int32, System.Delegate) at System.Windows.Threading.Dispatcher.LegacyInvokeImpl (System.Windows.Threading.DispatcherPriority, System.TimeSpan,
System.Delegate, System.Object, Int32) at MS.Win32.HwndSubclass.SubclassWndProc(IntPtr, Int32, IntPtr, IntPtr) at MS.Win32.UnsafeNativeMethods.CallWindowProc(IntPtr, IntPtr, Int32, IntPtr, IntPtr) at MS.Win32.HwndSubclass.DefWndProcWrapper(IntPtr, Int32, IntPtr, IntPtr) at MS.Win32.UnsafeNativeMethods.CallWindowProc(IntPtr, IntPtr, Int32, IntPtr, IntPtr) at MS.Win32.HwndSubclass.SubclassWndProc(IntPtr, Int32, IntPtr, IntPtr) at MS.Win32.UnsafeNativeMethods.SetWindowPos (System.Runtime.InteropServices.HandleRef,
System.Runtime.InteropServices.HandleRef, Int32, Int32, Int32, Int32, Int32) at System.Windows.Window.SetupInitialState(Double, Double, Double, Double) at System.Windows.Window.CreateSourceWindow(Boolean) at System.Windows.Window.CreateSourceWindowDuringShow() at System.Windows.Window.SafeCreateWindowDuringShow() at System.Windows.Window.ShowHelper(System.Object) at System.Windows.Window.Show() at
Org.Bestinet.BV.Presentation.UI.BusyIndicatorHelper.ShowProgWindowCustomSize (Org.Bestinet.BV.Presentation.UI.WindowCustom) at
Org.Bestinet.BV.Presentation.UI.BusyIndicatorHelper+<> c__DisplayClass2.<ShowBusyIndicatorCustomSize>b__0() at System.Threading.ThreadHelper.ThreadStart_Context(System.Object) at
System.Threading.ExecutionContext.RunInternal (System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object, Boolean) 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.Threading.ThreadHelper.ThreadStart()

我怀疑是因为 VerifyFinger 函数，因为这是我们检查指纹图像的地方

BusyIndicatorHelper busyIndicatorHelper = new BusyIndicatorHelper();
List<WorkerDO> docList = new         
DatabaseHelper().SearchDocInfo(UserContext.VdrInfo.WorkerObj.WrkrId);

if (docList != null && docList.Count > 0)
{   busyIndicatorHelper.ShowBusyIndicatorCustomSize("Verification",  
    WindowSetting.GetCurrentWindowState(this));

    FingerPrintHelper fp = null;
    if (_fpHelper != null)
       fp = _fpHelper;
    else
       fp = FingerPrintHelper.GetFingerPrinterHelperObj;

    verifyStatus = fp.VerifyFinger(docList, _viewModel.DetectedFingers,  
    IsIndexFingerSelected);
    docList = null;
    _viewModel.DetectedFingers = null;
}

Answer 1

每次调用此方法时，您都会在新线程上创建一个新的 LoadingWindow 对象。

progWindow = new LoadingWindow(_message);

您是否在创建新 LoadingWindow 之前释放之前的 LoadingWindow？

Answer 2

为什么要关闭 CurrentDispatcher？它是您程序的唯一一个，您的代码将永远不会执行关闭。所以每次你打开你的BusyWindow，都会创建新的线程（-1MB从你的内存中），它会陷入死循环，消耗另一部分系统资源。最终您的程序将超出内存，正如您的异常所述，这是发生的。

您真的不应该为您的任务启动一个新线程 - 使用更高级别的抽象，可能是 ThreadPool or Task Parallel Library。这将有助于消除代码中的内存泄漏。

更新：
我在你的新代码中看到这样一行：

_viewModel.DetectedFingers = null;

我怀疑这是一个 Image you got from client. If so, you can't simply set it to null, you must Dispose() 它来释放你的图形资源，像这样：

verifyStatus = fp.VerifyFinger(docList, _viewModel.DetectedFingers,  
IsIndexFingerSelected);
docList = null;
_viewModel.DetectedFingers.Dispose();
_viewModel.DetectedFingers = null;

Answer 3

问题已找到。这不是因为 WPF 代码，而是因为我们使用的 SDK 内存不足。

问题已解决。谢谢。

WPF 应用程序中的线程抛出 System.OutOfMemoryException

Thread throw System.OutOfMemoryException in WPF application

c#

wpf

multithreading

out-of-memory