捕获子线程异常 vb.net c#

c#

 

如果程序里面使用了多线程技术的话!就需要对子线程的异常做出特殊的处理!
据我所知,如果没有做特殊处理的话,好像子线程的异常不会抛给主线程,有时会直接在客户端抛出异常(这当然不是我们想要的),更夸张的是,有时直接把程序给强制关闭了!
在用户的角度上,就像按了一个关闭按钮一样!我今天就遇到这样的一个问题!

帮朋友做了一个工具,在本地运行,测试,一切都是那么的完美,没有任何问题.但一到客户机的时候,一运行到多线程的地方,就自动关闭软件了!在他看来就像按了关闭程序的按钮一样!

那我们应该解决这个问题.,如何捕捉这个子线程的异常呢!其实也很简单,只要几行代码即可!(主要是自己做下笔记,以后可以查)

在程序的Program类的Main方法里面添加如下代码
#if !DEBUG
            Application.ThreadException += new ThreadExceptionEventHandler(Application_ThreadException);
         
#endif

同时再添加两个方法处理异常信息!

 static void Application_ThreadException(object sender, ThreadExceptionEventArgs e)
        {
            MessageBox.Show(e.Exception.Message, "系统错误", MessageBoxButtons.OK, MessageBoxIcon.Error);
        }

        static void UnhandledExceptionFunction(Object sender, UnhandledExceptionEventArgs args)
        {
            MessageBox.Show(((Exception)args.ExceptionObject).Message, "系统错误", MessageBoxButtons.OK, MessageBoxIcon.Error);
        }

其它主要处理子线程错误的就只有这两行
  Application.SetUnhandledExceptionMode(UnhandledExceptionMode.CatchException);
  AppDomain.CurrentDomain.UnhandledException += new UnhandledExceptionEventHandler(UnhandledExceptionFunction);
以及UnhandledExceptionFunction方法

这样就可以捕捉到子线程的异常了!要不是以前自己遇过一次,都不知怎么回事呢!呵!

 

文章出处：飞诺网(www.firnow.com):http://dev.firnow.com/course/4_webprogram/asp.net/netjs/20100714/445480.html

 

 

 

vb.net

 

 

Public Sub FormMain_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load   AddHandler AppDomain.CurrentDomain.UnhandledException, AddressOf MyHandler  AddHandler Application.ThreadException, AddressOf MyThreadHandlerEnd Sub''Backup in case of crash applicationPrivate Sub MyHandler(ByVal sender As Object, ByVal args As UnhandledExceptionEventArgs)Dim e As Exception = DirectCast(args.ExceptionObject, Exception)If e.Message IsNot Nothing Then'Globals.startBackup(System.Configuration.ConfigurationManager.AppSettings.Get("DatabaseName"), System.IO.Path.GetDirectoryName(System.Configuration.ConfigurationManager.AppSettings.Get("DatabaseName")) & "/" & System.IO.Path.GetFileNameWithoutExtension(System.Configuration.ConfigurationManager.AppSettings.Get("DatabaseName")) & ".bak")'Delete the old filename'Reopen the *.bak filename'Rename it as *.mdbIf System.IO.File.Exists(System.IO.Path.GetDirectoryName(System.Configuration.ConfigurationManager.AppSettings.Get("DatabaseName")) & "/" & System.IO.Path.GetFileNameWithoutExtension(System.Configuration.ConfigurationManager.AppSettings.Get("DatabaseName")) & ".bak") ThenGlobals.startBackup(System.IO.Path.GetDirectoryName(System.Configuration.ConfigurationManager.AppSettings.Get("DatabaseName")) & "/" & System.IO.Path.GetFileNameWithoutExtension(System.Configuration.ConfigurationManager.AppSettings.Get("DatabaseName")) & ".bak", System.Configuration.ConfigurationManager.AppSettings.Get("DatabaseName"))' Save the app config settings now that user wants to open an existing modelAppConfigSettings.UpdateAppSettings("DatabaseName", System.Configuration.ConfigurationManager.AppSettings.Get("DatabaseName"))AppConfigSettings.UpdateAppSettings("LocaleIdentifier", System.Threading.Thread.CurrentThread.CurrentUICulture.LCID) System.Configuration.ConfigurationManager.RefreshSection("appSettings")OdbcLib.EditSystemDSN("Microsoft Access Driver (*.mdb)", "ALiSSv3.0", "(*.mdb)", System.Configuration.ConfigurationManager.AppSettings.Get("DatabaseName"))'Update the XML Settings internal config fileMyAppSettings.UpdateXmlFile(System.Configuration.ConfigurationManager.AppSettings.Get("DatabaseName"))ElseGlobals.copyDatabase(System.Configuration.ConfigurationManager.AppSettings.Get("DatabaseName"), System.IO.Path.GetDirectoryName(System.Configuration.ConfigurationManager.AppSettings.Get("DatabaseName")) & "/" & System.IO.Path.GetFileNameWithoutExtension(System.Configuration.ConfigurationManager.AppSettings.Get("DatabaseName")) & ".bak")End If  End IfEnd SubPrivate Sub MyThreadHandler(ByVal sender As Object, ByVal args As ThreadExceptionEventArgs)Dim e As Exception = DirectCast(args.Exception, Exception)If e.Message IsNot Nothing Then'Globals.startBackup(System.Configuration.ConfigurationManager.AppSettings.Get("DatabaseName"), System.IO.Path.GetDirectoryName(System.Configuration.ConfigurationManager.AppSettings.Get("DatabaseName")) & "/" & System.IO.Path.GetFileNameWithoutExtension(System.Configuration.ConfigurationManager.AppSettings.Get("DatabaseName")) & ".bak")'Delete the old filename'Reopen the *.bak filename'Rename it as *.mdbIf System.IO.File.Exists(System.IO.Path.GetDirectoryName(System.Configuration.ConfigurationManager.AppSettings.Get("DatabaseName")) & "/" & System.IO.Path.GetFileNameWithoutExtension(System.Configuration.ConfigurationManager.AppSettings.Get("DatabaseName")) & ".bak") ThenGlobals.copyDatabase(System.IO.Path.GetDirectoryName(System.Configuration.ConfigurationManager.AppSettings.Get("DatabaseName")) & "/" & System.IO.Path.GetFileNameWithoutExtension(System.Configuration.ConfigurationManager.AppSettings.Get("DatabaseName")) & ".bak", System.Configuration.ConfigurationManager.AppSettings.Get("DatabaseName"))' Save the app config settings now that user wants to open an existing modelAppConfigSettings.UpdateAppSettings("DatabaseName", System.Configuration.ConfigurationManager.AppSettings.Get("DatabaseName"))AppConfigSettings.UpdateAppSettings("LocaleIdentifier", System.Threading.Thread.CurrentThread.CurrentUICulture.LCID) System.Configuration.ConfigurationManager.RefreshSection("appSettings")OdbcLib.EditSystemDSN("Microsoft Access Driver (*.mdb)", "ALiSSv3.0", "(*.mdb)", System.Configuration.ConfigurationManager.AppSettings.Get("DatabaseName"))'Update the XML Settings internal config fileMyAppSettings.UpdateXmlFile(System.Configuration.ConfigurationManager.AppSettings.Get("DatabaseName"))MessageBox.Show("Fatal Error.Application is shutting down.....Please restart ALiSS session", "Fatal Error", MessageBoxButtons.OK, MessageBoxIcon.Error)System.Diagnostics.Process.GetCurrentProcess.Kill()ElseGlobals.copyDatabase(System.Configuration.ConfigurationManager.AppSettings.Get("DatabaseName"), System.IO.Path.GetDirectoryName(System.Configuration.ConfigurationManager.AppSettings.Get("DatabaseName")) & "/" & System.IO.Path.GetFileNameWithoutExtension(System.Configuration.ConfigurationManager.AppSettings.Get("DatabaseName")) & ".bak")End IfEnd IfEnd Sub