Application.ThreadException 事件
在发生未捕获线程异常时发生。
**命名空间:**System.Windows.Forms
**程序集:**System.Windows.Forms（在 system.windows.forms.dll 中）
语法
声明
Public Shared Event ThreadException As ThreadExceptionEventHandler
用法
Dim handler As ThreadExceptionEventHandler
AddHandler Application.ThreadException, handler
public static event ThreadExceptionEventHandler ThreadException
public:
static event ThreadExceptionEventHandler^ ThreadException {
void add (ThreadExceptionEventHandler^ value);
void remove (ThreadExceptionEventHandler^ value);
}
/** @event */
public static void add_ThreadException (ThreadExceptionEventHandler value)
/** @event */
public static void remove_ThreadException (ThreadExceptionEventHandler value)
JScript 支持使用事件，但不支持进行新的声明。
备注
该事件允许您的 Windows 窗体应用程序处理本来未处理的异常。请将事件处理程序附加到 ThreadException 事件以处理这些异常，因为这些异常将使您的应用程序处于未知状态。应尽可能使用结构化异常处理块来处理异常。
示例
下面的代码示例在窗体上的 button1 被单击时引发 ThreadException 事件。示例创建两个类。ErrorHandler 类创建引发该事件的窗体和按钮。CustomExceptionHandler 类提供处理异常的方法。
在 ErrorHandler 类的 Main 中，这段代码创建异常处理类的新实例（即 CustomExceptionHandler 的实例）。然后该实例被添加到事件中，并且运行应用程序。
在 CustomExceptionHandler 类的 OnThreadException 方法中，此示例使用 try...catch...finally 语句处理异常。ShowThreadExceptionDialog 方法创建要显示的消息并在消息框中显示。
' Creates a class to throw the error.
Public Class ErrorHandler
Inherits System.Windows.Forms.Form
' Inserts the code to create a form with a button.
' Programs the button to throw an exception when clicked.
Private Sub button1_Click(sender As object, e As System.EventArgs)
Throw New ArgumentException("The parameter was invalid")
End Sub
<STAThread()> _
Shared Sub Main()
' Creates an instance of the methods that will handle the exception.
Dim eh As CustomExceptionHandler = New CustomExceptionHandler()
' Adds the event handler to the event.
AddHandler Application.ThreadException, AddressOf eh.OnThreadException
' Runs the application.
Application.Run(new ErrorHandler())
End Sub
End Class
' Creates a class to handle the exception event.
Private Class CustomExceptionHandler
' Handles the exception event.
Public Sub OnThreadException(sender As object, t As ThreadExceptionEventArgs)
Dim result As DialogResult = System.Windows.Forms.DialogResult.Cancel
Try
result = Me.ShowThreadExceptionDialog(t.Exception)
Catch
Try
MessageBox.Show("Fatal Error", "Fatal Error", MessageBoxButtons.AbortRetryIgnore, MessageBoxIcon.Stop)
Finally
Application.Exit()
End Try
End Try
' Exits the program when the user clicks Abort.
If (result = System.Windows.Forms.DialogResult.Abort) Then
Application.Exit()
End If
End Sub
' Creates the error message and displays it.
Private Function ShowThreadExceptionDialog(e As Exception) As DialogResult
Dim errorMsg As StringWriter = New StringWriter()
errorMsg.WriteLine("An error occurred please contact the adminstrator with the following information:")
errorMsg.WriteLine("")
errorMsg.WriteLine(e.Message)
errorMsg.WriteLine("")
errorMsg.WriteLine("Stack Trace:")
errorMsg.WriteLine(e.StackTrace)
Return MessageBox.Show(errorMsg.ToString(), "Application Error", MessageBoxButtons.AbortRetryIgnore, MessageBoxIcon.Stop)
End Function
End Class
// Creates a class to throw the error.
public class ErrorHandler : System.Windows.Forms.Form {
// Inserts the code to create a form with a button.
// Programs the button to throw an exception when clicked.
private void button1_Click(object sender, System.EventArgs e) {
throw new ArgumentException("The parameter was invalid");
}
public static void Main(string[] args) {
// Creates an instance of the methods that will handle the exception.
CustomExceptionHandler eh = new CustomExceptionHandler();
// Adds the event handler to to the event.
Application.ThreadException += new ThreadExceptionEventHandler(eh.OnThreadException);
// Runs the application.
Application.Run(new ErrorHandler());
}
}
// Creates a class to handle the exception event.
internal class CustomExceptionHandler {
// Handles the exception event.
public void OnThreadException(object sender, ThreadExceptionEventArgs t)
{
DialogResult result = DialogResult.Cancel;
try
{
result = this.ShowThreadExceptionDialog(t.Exception);
}
catch
{
try
{
MessageBox.Show("Fatal Error", "Fatal Error", MessageBoxButtons.AbortRetryIgnore, MessageBoxIcon.Stop);
}
finally
{
Application.Exit();
}
}
// Exits the program when the user clicks Abort.
if (result == DialogResult.Abort)
Application.Exit();
}
// Creates the error message and displays it.
private DialogResult ShowThreadExceptionDialog(Exception e) {
string errorMsg = "An error occurred please contact the adminstrator with the following information:\n\n";
errorMsg = errorMsg + e.Message + "\n\nStack Trace:\n" + e.StackTrace;
return MessageBox.Show(errorMsg, "Application Error", MessageBoxButtons.AbortRetryIgnore, MessageBoxIcon.Stop);
}
}
// Creates a class to throw the error.
public:
ref class ErrorHandler: public System::Windows::Forms::Form
{
// Inserts the code to create a form with a button.
// Programs the button to throw an exception when clicked.
private:
void button1_Click( Object^ /*sender*/, System::EventArgs^ /*e*/ )
{
throw gcnew ArgumentException( "The parameter was invalid" );
}
public:
static void Main()
{
// Creates an instance of the methods that will handle the exception.
CustomExceptionHandler ^ eh = gcnew CustomExceptionHandler;
// Adds the event handler to to the event.
Application::ThreadException += gcnew ThreadExceptionEventHandler( eh, &Form1::CustomExceptionHandler::OnThreadException );
// Runs the application.
Application::Run( gcnew ErrorHandler );
}
};
// Creates a class to handle the exception event.
internal:
ref class CustomExceptionHandler
{
// Handles the exception event.
public:
void OnThreadException( Object^ /*sender*/, ThreadExceptionEventArgs^ t )
{
System::Windows::Forms::DialogResult result = ::DialogResult::Cancel;
try
{
result = this->ShowThreadExceptionDialog( t->Exception );
}
catch ( Exception^ )
{
try
{
MessageBox::Show( "Fatal Error", "Fatal Error", MessageBoxButtons::AbortRetryIgnore, MessageBoxIcon::Stop );
}
finally
{
Application::Exit();
}
}
// Exits the program when the user clicks Abort.
if ( result == ::DialogResult::Abort )
{
Application::Exit();
}
}
// Creates the error message and displays it.
private:
System::Windows::Forms::DialogResult ShowThreadExceptionDialog( Exception^ e )
{
String^ errorMsg = "An error occurred please contact the adminstrator with the following information:\n\n";
errorMsg = String::Concat( errorMsg, e->Message, "\n\nStack Trace:\n", e->StackTrace );
return MessageBox::Show( errorMsg, "Application Error", MessageBoxButtons::AbortRetryIgnore, MessageBoxIcon::Stop );
}
};
// Creates a class to throw the error.
public static class ErrorHandler extends System.Windows.Forms.Form
{
// Inserts the code to create a form with a button.
// Programs the button to throw an exception when clicked.
private void button1_Click(Object sender, System.EventArgs e)
{
throw new ArgumentException("The parameter was invalid");
} //button1_Click
public static void main(String[] args)
{
// Creates an instance of the methods that will handle
// the exception.
CustomExceptionHandler eh = new CustomExceptionHandler();
// Adds the event handler to to the event.
Application.add_ThreadException(
new ThreadExceptionEventHandler(eh.OnThreadException));
// Runs the application.
Application.Run(new ErrorHandler());
} //main
} //ErrorHandler
// Creates a class to handle the exception event.
static class CustomExceptionHandler
{
// Handles the exception event.
public void OnThreadException(Object sender, ThreadExceptionEventArgs t)
{
DialogResult result = DialogResult.Cancel;
try {
result = this.ShowThreadExceptionDialog(t.get_Exception());
}
catch (System.Exception exp) {
try {
MessageBox.Show("Fatal Error", "Fatal Error",
MessageBoxButtons.AbortRetryIgnore,
MessageBoxIcon.Stop);
}
finally {
Application.Exit();
}
}
// Exits the program when the user clicks Abort.
if (result.Equals(DialogResult.Abort)) {
Application.Exit();
}
} //OnThreadException
// Creates the error message and displays it.
private DialogResult ShowThreadExceptionDialog(System.Exception e)
{
String errorMsg = "An error occurred please contact the"
+ " administrator with the following information:\n\n";
errorMsg = errorMsg + e.get_Message() + "\n\nStack Trace:\n"
+ e.get_StackTrace();
return MessageBox.Show(errorMsg, "Application Error",
MessageBoxButtons.AbortRetryIgnore, MessageBoxIcon.Stop);
} //ShowThreadExceptionDialog
} //CustomExceptionHandler
public static void main(String[] args)
{
ErrorHandler.main(args);
}//main
.NET Framework 安全性
- SecurityPermission 供直接调用方在为该事件添加处理程序时调用非托管代码。关联的枚举：SecurityPermissionFlag.UnmanagedCode
平台
Windows 98、Windows 2000 SP4、Windows CE、Windows Millennium Edition、Windows Mobile for Pocket PC、Windows Mobile for Smartphone、Windows Server 2003、Windows XP Media Center Edition、Windows XP Professional x64 Edition、Windows XP SP2、Windows XP Starter Edition
.NET Framework 并不是对每个平台的所有版本都提供支持。有关受支持版本的列表，请参见系统要求。
版本信息
.NET Framework
受以下版本支持：2.0、1.1、1.0