ThreadAbortException Classe

Definição

public ref class ThreadAbortException sealed : SystemException

public sealed class ThreadAbortException : SystemException

[System.Serializable]
public sealed class ThreadAbortException : SystemException

[System.Serializable]
[System.Runtime.InteropServices.ComVisible(true)]
public sealed class ThreadAbortException : SystemException

type ThreadAbortException = class
    inherit SystemException

[<System.Serializable>]
type ThreadAbortException = class
    inherit SystemException

[<System.Serializable>]
[<System.Runtime.InteropServices.ComVisible(true)>]
type ThreadAbortException = class
    inherit SystemException

Public NotInheritable Class ThreadAbortException
Inherits SystemException

Herança

Object

Exception

SystemException

ThreadAbortException

Atributos

SerializableAttribute ComVisibleAttribute

Exemplos

O exemplo a seguir demonstra a anulação de um thread. O thread que recebe o ThreadAbortException usa o ResetAbort método para cancelar a solicitação de anulação e continuar em execução.

using namespace System;
using namespace System::Threading;
using namespace System::Security::Permissions;
ref class ThreadWork
{
public:
   static void DoWork()
   {
      try
      {
         for ( int i = 0; i < 100; i++ )
         {
            Console::WriteLine( "Thread - working." );
            Thread::Sleep( 100 );

         }
      }
      catch ( ThreadAbortException^ e ) 
      {
         Console::WriteLine( "Thread - caught ThreadAbortException - resetting." );
         Console::WriteLine( "Exception message: {0}", e->Message );
         Thread::ResetAbort();
      }

      Console::WriteLine( "Thread - still alive and working." );
      Thread::Sleep( 1000 );
      Console::WriteLine( "Thread - finished working." );
   }

};

int main()
{
   ThreadStart^ myThreadDelegate = gcnew ThreadStart( ThreadWork::DoWork );
   Thread^ myThread = gcnew Thread( myThreadDelegate );
   myThread->Start();
   Thread::Sleep( 100 );
   Console::WriteLine( "Main - aborting my thread." );
   myThread->Abort();
   myThread->Join();
   Console::WriteLine( "Main ending." );
}

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.");
                Thread.Sleep(100);
            }
        }
        catch(ThreadAbortException e) {
            Console.WriteLine("Thread - caught ThreadAbortException - resetting.");
            Console.WriteLine("Exception message: {0}", e.Message);
            Thread.ResetAbort();
        }
        Console.WriteLine("Thread - still alive and working.");
        Thread.Sleep(1000);
        Console.WriteLine("Thread - finished working.");
    }
}

class ThreadAbortTest {
    public static void Main() {
        ThreadStart myThreadDelegate = new ThreadStart(ThreadWork.DoWork);
        Thread myThread = new Thread(myThreadDelegate);
        myThread.Start();
        Thread.Sleep(100);
        Console.WriteLine("Main - aborting my thread.");
        myThread.Abort();
        myThread.Join();
        Console.WriteLine("Main ending.");
    }
}

Imports System.Threading
Imports System.Security.Permissions


Public Class ThreadWork
   Public Shared Sub DoWork()
      Try
         Dim i As Integer
         For i = 0 To 99
            Console.WriteLine("Thread - working.")
            Thread.Sleep(100)
         Next i
      Catch e As ThreadAbortException
         Console.WriteLine("Thread - caught ThreadAbortException - resetting.")
         Console.WriteLine("Exception message: {0}", e.Message)
         Thread.ResetAbort()
      End Try
      Console.WriteLine("Thread - still alive and working.")
      Thread.Sleep(1000)
      Console.WriteLine("Thread - finished working.")
   End Sub
End Class


Class ThreadAbortTest
   Public Shared Sub Main()
      Dim myThreadDelegate As New ThreadStart(AddressOf ThreadWork.DoWork)
      Dim myThread As New Thread(myThreadDelegate)
      myThread.Start()
      Thread.Sleep(100)
      Console.WriteLine("Main - aborting my thread.")
      myThread.Abort()
      myThread.Join()
      Console.WriteLine("Main ending.")
   End Sub
End Class

Este código produz a seguinte saída:

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.  

Comentários

Quando uma chamada é feita ao Abort método para destruir um thread, o Common Language Runtime lança um ThreadAbortException no .NET Framework. ThreadAbortException é uma exceção especial que pode ser capturada, mas será gerada automaticamente novamente no final do catch bloco. Quando essa exceção é gerada, o runtime executa todos os finally blocos antes de encerrar o thread. Como o thread pode fazer uma computação não limitada nos finally blocos ou chamar Thread.ResetAbort para cancelar a anulação, não há nenhuma garantia de que o thread será encerrado. Se você quiser aguardar até que o thread anulado seja encerrado, chame o Thread.Join método . Join é uma chamada de bloqueio que não retorna até que o thread realmente pare de ser executado.

ThreadAbortException usa HRESULT COR_E_THREADABORTED, que tem o valor 0x80131530.

Propriedades

Métodos

Eventos

Aplica-se a

Confira também

• Thread
• Abort(Object)
• Destruindo threads