ThreadExceptionEventArgs.Exception Property
Important
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Gets the Exception that occurred.
public:
property Exception ^ Exception { Exception ^ get(); };
public Exception Exception { get; }
member this.Exception : Exception
Public ReadOnly Property Exception As Exception
The Exception that occurred.
The following example allows you to raise a ThreadException event by clicking button1
on a form. The example creates two classes. The ErrorHandler
class creates the form and the button that raises the event. The CustomExceptionHandler
class provides the methods to handle the exception.
In Main
in the ErrorHandler
class, the code creates a new instance of the exception handling class, that is, an instance of the CustomExceptionHandler
. Then the instance is added to the event, and the application is run.
In the OnThreadException
method in the CustomExceptionHandler
class, the example uses a try...catch...finally
statement to process the exception. The ShowThreadExceptionDialog
method creates the message to display, and displays it in a message box.
using System;
using System.Threading;
using System.Windows.Forms;
// Create a form with a button that, when clicked, throws an exception.
public class ErrorForm : System.Windows.Forms.Form
{
internal Button button1;
public ErrorForm() : base()
{
// Add the button to the form.
this.button1 = new System.Windows.Forms.Button();
this.SuspendLayout();
this.button1.Location = new System.Drawing.Point(100, 43);
this.button1.Size = new System.Drawing.Size(75, 23);
this.button1.Text = "Click!";
this.Controls.Add(this.button1);
this.button1.Click += new EventHandler(this.button1_Click);
this.Text = "ThreadException";
this.ResumeLayout(false);
}
// Throw an exception when the button is clicked.
private void button1_Click(object sender, System.EventArgs e)
{
throw new ArgumentException("The parameter was invalid");
}
public static void Main()
{
// Add the event handler.
Application.ThreadException += new ThreadExceptionEventHandler(CustomExceptionHandler.OnThreadException);
// Start the example.
Application.Run(new ErrorForm());
}
}
// Create a class to handle the exception event.
internal class CustomExceptionHandler
{
// Handle the exception event
public static void OnThreadException(object sender, ThreadExceptionEventArgs t)
{
DialogResult result = ShowThreadExceptionDialog(t.Exception);
// Exit the program when the user clicks Abort.
if (result == DialogResult.Abort)
Application.Exit();
}
// Create and display the error message.
private static DialogResult ShowThreadExceptionDialog(Exception e)
{
string errorMsg = "An error occurred. Please contact the adminstrator " +
"with the following information:\n\n";
errorMsg += string.Format("Exception Type: {0}\n\n", e.GetType().Name);
errorMsg += "\n\nStack Trace:\n" + e.StackTrace;
return MessageBox.Show(errorMsg, "Application Error",
MessageBoxButtons.AbortRetryIgnore, MessageBoxIcon.Stop);
}
}
Imports System.Threading
Imports System.Windows.Forms
' Create a form with a button that, when clicked, throws an exception.
Public Class ErrorForm : Inherits Form
Friend WithEvents button1 As Button
Public Sub New()
' Add the button to the form.
Me.button1 = New System.Windows.Forms.Button()
Me.SuspendLayout()
Me.button1.Location = New System.Drawing.Point(100, 43)
Me.button1.Size = New System.Drawing.Size(75, 23)
Me.button1.Text = "Click!"
Me.Controls.Add(Me.button1)
Me.Text = "ThreadException"
Me.ResumeLayout(False)
End Sub
' Throw an exception when the button is clicked.
Private Sub button1_Click(sender As Object, e As System.EventArgs) _
Handles button1.Click
Throw New ArgumentException("The parameter was invalid.")
End Sub
Public Shared Sub Main()
' Add the event handler.
AddHandler Application.ThreadException,
AddressOf CustomExceptionHandler.OnThreadException
' Start the example.
Application.Run(New ErrorForm())
End Sub
End Class
' Create a class to handle the exception event.
Friend Class CustomExceptionHandler
'Handle the exception event.
Public Shared Sub OnThreadException(sender As Object, t As ThreadExceptionEventArgs)
Dim result As DialogResult = ShowThreadExceptionDialog(t.Exception)
' Exit the program when the user clicks Abort.
If result = DialogResult.Abort Then
Application.Exit()
End If
End Sub
' Create and display the error message.
Private Shared Function ShowThreadExceptionDialog(e As Exception) As DialogResult
Dim errorMsg As String = "An error occurred. Please contact the " &
"adminstrator with the following information:" &
vbCrLf & vbCrLf
errorMsg &= "Exception Type: " & e.GetType().Name & vbCrLf & vbCrLf
errorMsg &= e.Message & vbCrLf & vbCrLf
errorMsg &= "Stack Trace: " & vbCrLf & e.StackTrace
Return MessageBox.Show(errorMsg, "Application Error",
MessageBoxButtons.AbortRetryIgnore, MessageBoxIcon.Stop)
End Function
End Class
Product | Versions |
---|---|
.NET | Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9 |
.NET Framework | 1.1, 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1 |
.NET Standard | 2.0, 2.1 |
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