Question

我有一个Async方法可以关闭一些浏览器弹出窗口。

有时，应用程序在退出时崩溃并出现.NET Runtime错误（ mscorwks.dll ，异常代码 0xc0000005 ）。我怀疑当Thread被迫终止时会发生这种情况，因为我看不到记录的“线程退出”行。可能是引发ExtendedIeBrowser的{{1}}内的代码吗？

您可以在下面找到源代码。

unhandled exception

internal void KeepAliveAsync() { PageController controller = new PageController(); controller.Initialize(siteWebBrowser); var thread = new Thread(() => { _logger.Debug("Thread start - KeepAliveAsync"); try { while (!Program.ShouldAbortBackgroundOperations()) { try { if (controller.TryCloseTimeoutWarningPopup()) { _logger.Info("KeepAliveAsync: Closed popup successfully"); } Thread.Sleep(5000); } catch (Exception ex) { _logger.ErrorException("KeepAliveAsync", ex); } } } catch (Exception ex) { _logger.ErrorException("KeepAliveAsync", ex); } _logger.Debug("Thread exit - KeepAliveAsync"); }); thread.Name = "KeepAliveAsync"; thread.IsBackground = true; thread.SetApartmentState(ApartmentState.STA); thread.Start(); }使用此类：

PageController

这是：

public class ExtendedIeBrowser : IE
{
    private IntPtr hwnd;
    private static Logger _logger = LogManager.GetCurrentClassLogger();

    public ExtendedIeBrowser(WebBrowser webBrowserControl) : base(webBrowserControl.ActiveXInstance, false)
    {
    }

    public void Initialize(WebBrowser webBrowserControl)
    {
        hwnd = webBrowserControl.FindForm().Handle;

        // Start the dialog watcher or else the browser won't be able to attach the handler.
        StartDialogWatcher();
    }
    public override IntPtr hWnd
    {
        get
        {
            return hwnd;
        }
    }

    protected override void Dispose(bool disposing)
    {
        hwnd = IntPtr.Zero;
        base.Dispose(disposing);
    }
}

关闭弹出窗口的方法（字面意思是网页内的div）：

    internal static bool ShouldAbortBackgroundOperations()
    {
        bool should = true;

        try
        {
            should &= Application.OpenForms.Cast<Form>().Count(f => f.ShowInTaskbar) == 0; // at least one form is shown in the taskbar
        }
        catch (Exception ex)
        {
            _logger.ErrorException("ShouldAbortBackgroundOperations", ex);
            should = false;
        }

        return should;
    }

如果在执行Abort检查和CloseTimeoutWarningPopup（）后程序被关闭怎么办？我注意到在关闭应用程序后的某个时刻，internal bool TryCloseTimeoutWarningPopup() { bool success = false; try { Div glassPane = Browser.Div(Find.ByClass(PageConstants.ModalGlassPaneClass)); if (glassPane.Exists) // there is a popup { Div parent = (Div)glassPane.Parent; if (parent.InnerHtml.Contains(PageConstants.WarningLoggingOutPrimaryKeyword)) // correct content on popup { WatiN.Core.Button button = parent.Divs[0].Buttons[0]; ClickOnElement(button); success = true; } } } catch (Exception ex) { _logger.ErrorException("CloseTimeoutWarningPopup", ex); throw; } return success; }行正在等待元素显示并尝试访问已处置的对象。难道该对象的内存地址不再可用，因此被拒绝了吗？

Answer 1

问题是controller尝试访问的某些控件在线程终止之前被处理，导致访问冲突异常。

由线程未处理的异常引起的.NET运行时异常

1 个答案: