如果我在VisualStudio 2010中不使用调试，我的应用程序按预期工作，但我在调试模式下收到ObjectDisposedException投诉。我已阅读MS文档和其他几个主题，我无法发现问题。代码中记录了异常点，随后是堆栈跟踪。谢谢你的帮助。
Form1.cs
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Threading;
using CSharpJExcel.Jxl;
namespace Importer
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
openFileDialog1.Filter = "Text Files (.xls)|*.xls|All Files (*.*)|*.*";
openFileDialog1.FilterIndex = 1;
openFileDialog1.FileName = as400TextBox.Text;
}
delegate void messageBoxCallback(string text);
private void button1_Click(object sender, EventArgs e)
{
openFileDialog1.FileName = as400TextBox.Text;
if (openFileDialog1.ShowDialog() == DialogResult.OK)
{
as400File = openFileDialog1.FileName;
as400TextBox.Text = as400File;
buildDataView(as400TextBox.Text);
}
else
{
as400TextBox.Text = "";
openFileDialog1.FileName = as400TextBox.Text;
}
}
private void uploadButton_Click(object sender, EventArgs e)
{
Workbook workbook = Workbook.getWorkbook(new System.IO.FileInfo(as400TextBox.Text));
var sheet = workbook.getSheet(0);
uploadProgress.Maximum = sheet.getRows();
workbook.close();
backgroundWorker1.RunWorkerAsync((String)as400TextBox.Text);
}
private string as400File;
private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
{
appendMessage(((string)e.Argument));
Workbook workbook=null;
workbook = Workbook.getWorkbook(new System.IO.FileInfo(((String)e.Argument)));
appendMessage("Workbook opened");
var sheet = workbook.getSheet(0);
int r = 1;
string barcode, fname, lname, adname, student_id;
Cell[] row;
//uploadProgress.Maximum = sheet.getRows();
while (true)//process xls to SQL
{
try
{
row = sheet.getRow(r);
}
catch (IndexOutOfRangeException)
{
appendMessage("Processed: " + r);
workbook.close();
break;
}
student_id = ((string)row[0].getContents()).Trim();
barcode = ((string)row[1].getContents()).Trim();
lname = ((string)row[2].getContents()).Trim();
fname = ((string)row[3].getContents()).Trim();
adname = ((string)row[4].getContents()).Trim() + ((string)row[5].getContents()).Trim();
appendMessage(lname + " " + fname + " " + barcode + " " + adname + " " + student_id);
backgroundWorker1.ReportProgress(++r);
}
}
private void backgroundWorker1_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
uploadProgress.Value = e.ProgressPercentage;
appendMessage("Status: " + (int)e.UserState);
}
private void backgroundWorker1_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
appendMessage("Done!");
}
private void appendMessage(string msg)
{
if (InvokeRequired)
{
messageBoxCallback mb = new messageBoxCallback(appendMessage);
this.Invoke(mb, new object[] { msg });//<---ObjectDisposedException
return;
}
messageBox.Text += (msg + Environment.NewLine);
}
private void openFileDialog1_FileOk(object sender, CancelEventArgs e)
{
}
}
}
Program.cs:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows.Forms;
namespace Importer
{
static class Program
{
/// <summary>
/// The main entry point for the application.
/// </summary>
[STAThread]
static void Main()
{
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
Application.Run(new Form1());//<--TargetInvocationException (after ObjDisp is swallowed)
}
}
}
Stack Trace:
System.ObjectDisposedException was unhandled by user code
Message=Cannot access a disposed object.
Object name: 'Form1'.
Source=System.Windows.Forms
ObjectName=Form1
StackTrace:
at System.Windows.Forms.Control.MarshaledInvoke(Control caller, Delegate method, Object[] args, Boolean synchronous)
at System.Windows.Forms.Control.Invoke(Delegate method, Object[] args)
at Importer.Form1.appendMessage(String msg) in C:\Users\Administrator\Google Drive\prj_tmp\Importer\Importer\Form1.cs:line 188
at Importer.Form1.backgroundWorker1_DoWork(Object sender, DoWorkEventArgs e) in C:\Users\Administrator\Google Drive\prj_tmp\Importer\Importer\Form1.cs:line 163
at System.ComponentModel.BackgroundWorker.OnDoWork(DoWorkEventArgs e)
at System.ComponentModel.BackgroundWorker.WorkerThreadStart(Object argument)
InnerException:
If I swallow this exception I get:
System.Reflection.TargetInvocationException was unhandled
Message=Exception has been thrown by the target of an invocation.
Source=mscorlib
StackTrace:
at System.RuntimeMethodHandle._InvokeMethodFast(Object target, Object[] arguments, SignatureStruct& sig, MethodAttributes methodAttributes, RuntimeTypeHandle typeOwner)
at System.RuntimeMethodHandle.InvokeMethodFast(Object target, Object[] arguments, Signature sig, MethodAttributes methodAttributes, RuntimeTypeHandle 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.Forms.Control.InvokeMarshaledCallbackDo(ThreadMethodEntry tme)
at System.Windows.Forms.Control.InvokeMarshaledCallbackHelper(Object obj)
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)
at System.Windows.Forms.Control.InvokeMarshaledCallback(ThreadMethodEntry tme)
at System.Windows.Forms.Control.InvokeMarshaledCallbacks()
at System.Windows.Forms.Control.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.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg)
at System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(Int32 dwComponentID, Int32 reason, Int32 pvLoopData)
at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)
at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)
at System.Windows.Forms.Application.Run(Form mainForm)
at AlphaCardImporter.Program.Main() in C:\Users\Administrator\Google Drive\prj_tmp\Importer\Importer\Program.cs:line 18
at System.AppDomain._nExecuteAssembly(Assembly 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)
at System.Threading.ThreadHelper.ThreadStart()
InnerException: System.NullReferenceException
Message=Object reference not set to an instance of an object.
Source=AlphaCardImporter
StackTrace:
at AlphaCardImporter.Form1.backgroundWorker1_ProgressChanged(Object sender, ProgressChangedEventArgs e) in C:\Users\Administrator\Google Drive\prj_tmp\Importer\Importer\Form1.cs:line 173
at System.ComponentModel.BackgroundWorker.OnProgressChanged(ProgressChangedEventArgs e)
at System.ComponentModel.BackgroundWorker.ProgressReporter(Object arg)
InnerException:
答案 0 :(得分：1)
当您在没有调试器的情况下运行时，可能会发生异常，您只是没有得到通知。在非调试运行中，当后台线程发生异常时，不会通知您，后台线程只是退出。
编辑代码以在异常发生时写入日志文件或其他内容，您可能会看到相同的行为。
答案 1 :(得分：0)
这是违规行：
appendMessage("Status: " + (int)e.UserState); <-- there is no (int)e.UserState
当我在VS2010中没有调试的情况下运行时，我得到了一条更有意义的JIT运行时消息，这让我想到了这一行。