base.Show() 抛出 InvalidOperationException

Question

我遇到了 base.Show() 引发 InvalidOperationException 的问题。这有几个问题：

1. 只有当我在 Debug -> Exceptions 菜单中显示“Common Language Runtime Exceptions”时才会在 vs2012 中显示该错误，但如果我在没有它的情况下运行它则不会。
2. 在 vs2012 之外运行程序时，会出现一个消息框，显示错误，并在本文底部显示堆栈跟踪。
3. 我曾尝试在线研究 base.Show() 上引发的 InvalidOperationException，但未能成功找到与 base.Show() 相关的任何内容。

程序正在做的是打开一个表单，当点击一个链接时，它会使用以下代码打开一个 DocViewer 窗口：

 private void paperVisionLink_Click(object sender, RoutedEventArgs e)
    {
        try
        {
            AnalRunSeq sequence = (bob.Resources["AnalRunSeqsCollection"] as CollectionViewSource).View.CurrentItem as AnalRunSeq;

            if (sequence != null)
            {
                try
                {
                    var pveView = this.ShowCOCDocumentForWorkorder((sequence.Sample.WorkOrderID));
                }
                catch (Exception ex)
                {
                    ELI_Data.DataLogger.Logger.Error("Error starting papervision window", ex);
                }
            }
        }
        catch
        {
            MessageBox.Show("Cannot find COC document for that Work Order.");
        }
    }

    public Window ShowCOCDocumentForWorkorder(string workorder)
    {
        PaperVision pve = new PaperVision("bluser", "bluser");
        pve.SubmitSearchCriteria("WORK ORDER\tCATEGORY", workorder.ToUpper() + "\tCOC");
        XDocument response = pve.ExecuteQuery();

        XElement documentXml = response.Descendants("DOC").FirstOrDefault();

        PVEWindow pveView = null;

        if (!documentXml.IsNull())
        {
            pveView = new PVEWindow();
            pveView.Show(
                string.Format("{0}/HttpInterface.asp", EnergyDatabase.Setup.DocImaging.WebService),
                EnergyDatabase.Setup.DocImaging.EntityID.Value,
                pve.SessionID,
                EnergyDatabase.Setup.DocImaging.DocProjects.Single(dp => dp.Project == "LOGIN").ProjectID.Value,
                documentXml.Attribute("DOCID").Value);
        }

        return pveView;
    }

pveView.Show 方法是 base.Show() 方法抛出执行的地方：

public void Show(string url, int entityId, string sessionId, int projId, string docId)
    {
        try
        {
            base.Show();  //exception thrown here
            this.PvdmDocView.InitComm(url, entityId, sessionId, projId, docId);
        }
        catch (Exception ex)
        {
            Logger.Error("Error opening papervision viewer", ex);
            throw;
        }
    }

这是程序在 Visual Studio 之外运行时引发的异常：

************** Exception Text **************
System.InvalidOperationException: Dispatcher processing has been suspended, but messages are still being processed.
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, Boolean isSingleParameter)
at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Boolean isSingleParameter, Delegate catchHandler)
at System.Windows.Threading.Dispatcher.WrappedInvoke(Delegate callback, Object args, Boolean isSingleParameter, Delegate catchHandler)
at System.Windows.Threading.Dispatcher.InvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Boolean isSingleParameter)
at System.Windows.Threading.Dispatcher.Invoke(DispatcherPriority priority, Delegate method, Object arg)
at MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam)
at System.Windows.Forms.UnsafeNativeMethods.CoCreateInstance(Guid& clsid, Object punkOuter, Int32 context, Guid& iid)
at System.Windows.Forms.AxHost.CreateWithoutLicense(Guid clsid)
at System.Windows.Forms.AxHost.CreateWithLicense(String license, Guid clsid)
at System.Windows.Forms.AxHost.CreateInstanceCore(Guid clsid)
at System.Windows.Forms.AxHost.CreateInstance()
at System.Windows.Forms.AxHost.GetOcxCreate()
at System.Windows.Forms.AxHost.TransitionUpTo(Int32 state)
at System.Windows.Forms.AxHost.CreateHandle()
at System.Windows.Forms.Control.CreateControl(Boolean fIgnoreVisible)
at System.Windows.Forms.Control.CreateControl(Boolean fIgnoreVisible)
at System.Windows.Forms.Control.CreateControl()
at System.Windows.Forms.Control.WmShowWindow(Message& m)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.ScrollableControl.WndProc(Message& m)
at System.Windows.Forms.ContainerControl.WndProc(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

最奇怪的是，虽然抛出了这个异常，但如果你在显示消息框后尝试继续，一切运行正常，所以我不知道如何解决这个问题。任何帮助将不胜感激！

编辑

我已更新上述帖子以删除线程并将 ShowCOCDocumentForWorkorder 方法添加到主窗口类。这应该可以解决之前发生的线程问题。现在发生的唯一应该更容易解决的问题是修复引发 InvalidOperationException 错误的 base.Show() 方法。中使用的类不允许使用 Invoke 方法，尽管我不知道为什么。 以下是 PVEWindow 类的完整类代码：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Shapes;

namespace Microbiology
{
    using System.Windows.Forms;

    /// <summary>
    /// Interaction logic for PVEWindow.xaml
    /// </summary>
    public partial class PVEWindow : Window
    {
        public PVEWindow()
        {
            this.InitializeComponent();
            base.Show();
        }

        public void Show(string url, int entityId, string sessionId, int projId, string docId)
        {
            //base.Show();
            try
            {
                this.PvdmDocView.InitComm(url, entityId, sessionId, projId, docId);
            }
            catch (Exception ex)
            {
                ELI_Data.DataLogger.Logger.Error("Error opening papervision viewer", ex);
                throw;
            }
        }
    }
}

Answer 1

我能够通过在调用 base.Show() 之前将以下代码添加到 Show 方法来解决该问题：

Application.SetUnhandledExceptionMode(UnhandledExceptionMode.ThrowException);