base.Show（）抛出InvalidOperationException
我遇到了base.Show（）抛出InvalidOperationException的问题。 这有几个问题：
程序正在做的是打开一个表单，当单击一个链接时，它将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 ORDERtCATEGORY", 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（）方法抛出错误的地方：
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;
}
}
这是当程序在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，尽管抛出了这个异常，但如果在显示消息框后尝试继续，所有内容都可以正常运行，所以我不确定如何解决此问题。 任何帮助将不胜感激！
编辑
我已经更新了上面的帖子以删除线程，并将ShowCOCDocumentForWorkorder方法添加到主窗口类中。 这应该解决之前发生的线程问题。 现在发生的唯一问题应该更容易解决，即修复base.Show（）方法抛出InvalidOperationException错误。 用于的类不允许使用Invoke方法，但我不确定原因。 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;
}
}
}
}
在base.Show（）调用之前，我可以通过将下面的代码添加到Show方法来解决问题：
Application.SetUnhandledExceptionMode(UnhandledExceptionMode.ThrowException);
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