ThreadAbortException Class


The .NET API Reference documentation has a new home. Visit the .NET API Browser on to see the new experience.

The exception that is thrown when a call is made to the Abort method. This class cannot be inherited.

Namespace:   System.Threading
Assembly:  mscorlib (in mscorlib.dll)


public sealed class ThreadAbortException : SystemException


Gets a collection of key/value pairs that provide additional user-defined information about the exception.(Inherited from Exception.)


Gets an object that contains application-specific information related to the thread abort.


Gets or sets a link to the help file associated with this exception.(Inherited from Exception.)


Gets or sets HRESULT, a coded numerical value that is assigned to a specific exception.(Inherited from Exception.)


Gets the Exception instance that caused the current exception.(Inherited from Exception.)


Gets a message that describes the current exception.(Inherited from Exception.)


Gets or sets the name of the application or the object that causes the error.(Inherited from Exception.)


Gets a string representation of the immediate frames on the call stack.(Inherited from Exception.)


Gets the method that throws the current exception.(Inherited from Exception.)


Determines whether the specified object is equal to the current object.(Inherited from Object.)


When overridden in a derived class, returns the Exception that is the root cause of one or more subsequent exceptions.(Inherited from Exception.)


Serves as the default hash function. (Inherited from Object.)

System_CAPS_pubmethodGetObjectData(SerializationInfo, StreamingContext)

When overridden in a derived class, sets the SerializationInfo with information about the exception.(Inherited from Exception.)


Gets the runtime type of the current instance.(Inherited from Exception.)


Creates and returns a string representation of the current exception.(Inherited from Exception.)

When a call is made to the Abort method to destroy a thread, the common language runtime throws a ThreadAbortException. ThreadAbortException is a special exception that can be caught, but it will automatically be raised again at the end of the catch block. When this exception is raised, the runtime executes all the finally blocks before ending the thread. Because the thread can do an unbounded computation in the finally blocks or call Thread.ResetAbort to cancel the abort, there is no guarantee that the thread will ever end. If you want to wait until the aborted thread has ended, you can call the Thread.Join method. Join is a blocking call that does not return until the thread actually stops executing.


When the common language runtime (CLR) stops background threadsafter all foreground threads in a managed executable have ended, it does not use Thread.Abort. Therefore, you cannot use ThreadAbortException to detect when background threads are being terminated by the CLR.

ThreadAbortException uses the HRESULT COR_E_THREADABORTED, which has the value 0x80131530.


The value of the inherited Data property is always null.

The following example demonstrates aborting a thread. The thread that receives the ThreadAbortException uses the ResetAbort method to cancel the abort request and continue executing.

using System;
using System.Threading;
using System.Security.Permissions;

public class ThreadWork {
    public static void DoWork() {
        try {
            for(int i=0; i<100; i++) {
                Console.WriteLine("Thread - working."); 
        catch(ThreadAbortException e) {
            Console.WriteLine("Thread - caught ThreadAbortException - resetting.");
            Console.WriteLine("Exception message: {0}", e.Message);
        Console.WriteLine("Thread - still alive and working."); 
        Console.WriteLine("Thread - finished working.");

class ThreadAbortTest {
    public static void Main() {
        ThreadStart myThreadDelegate = new ThreadStart(ThreadWork.DoWork);
        Thread myThread = new Thread(myThreadDelegate);
        Console.WriteLine("Main - aborting my thread.");
        Console.WriteLine("Main ending."); 

This code produces the following output:

Thread - working.
Main - aborting my thread.
Thread - caught ThreadAbortException - resetting.
Exception message: Thread was being aborted.
Thread - still alive and working.
Thread - finished working.
Main ending.

.NET Framework
Available since 1.1
Available since 2.0
Windows Phone Silverlight
Available since 7.0

Any public static ( Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Return to top