Application.ApplicationExit Événement

Référence

Définition

Espace de noms:: System.Windows.Forms

Assembly:: System.Windows.Forms.dll

Important

Certaines informations portent sur la préversion du produit qui est susceptible d’être en grande partie modifiée avant sa publication. Microsoft exclut toute garantie, expresse ou implicite, concernant les informations fournies ici.

Se produit lorsque l'application est sur le point de s'arrêter.

public:
 static event EventHandler ^ ApplicationExit;

public static event EventHandler ApplicationExit;

public static event EventHandler? ApplicationExit;

member this.ApplicationExit : EventHandler

Public Shared Custom Event ApplicationExit As EventHandler

Type d'événement

EventHandler

Exemples

L’exemple de code suivant affiche deux formulaires et quitte l’application lorsque les deux formulaires sont fermés. Lorsque l’application démarre et se ferme, la position de chaque formulaire est mémorisé. Cet exemple montre comment utiliser l’événement ApplicationExit pour savoir quand les positions du formulaire doivent être conservées dans le fichier et quand doit FileStream être fermé.

La classe MyApplicationContext hérite de ApplicationContext et effectue le suivi de la fermeture de chaque formulaire, et quitte le thread actuel lorsqu’ils le sont tous deux. La classe mémorise la position de chaque formulaire lorsqu’il est fermé. Lorsque l’événement ApplicationExit se produit, la classe écrit les positions de chaque utilisateur dans le fichier. Les données de position du formulaire sont stockées dans un fichier intitulé appdata.txt qui est créé à l’emplacement déterminé par UserAppDataPath. La Main méthode appelle Application.Run(context) pour démarrer l’application en fonction de .ApplicationContext

Ce code est un extrait de l’exemple présenté dans la vue d’ensemble de la ApplicationContext classe. Consultez ApplicationContext pour obtenir la liste complète du code.

   MyApplicationContext()
   {
      _formCount = 0;
      
      // Handle the ApplicationExit event to know when the application is exiting.
      Application::ApplicationExit += gcnew EventHandler( this, &MyApplicationContext::OnApplicationExit );
      try
      {
         
         // Create a file that the application will store user specific data in.
         _userData = gcnew FileStream( String::Concat( Application::UserAppDataPath, "\\appdata.txt" ),FileMode::OpenOrCreate );
      }
      catch ( IOException^ e ) 
      {
         
         // Inform the user that an error occurred.
         MessageBox::Show( "An error occurred while attempting to show the application. The error is: {0}", dynamic_cast<String^>(e) );
         
         // Exit the current thread instead of showing the windows.
         ExitThread();
      }

      
      // Create both application forms and handle the Closed event
      // to know when both forms are closed.
      _form1 = gcnew AppForm1;
      _form1->Closed += gcnew EventHandler( this, &MyApplicationContext::OnFormClosed );
      _form1->Closing += gcnew CancelEventHandler( this, &MyApplicationContext::OnFormClosing );
      _formCount++;
      _form2 = gcnew AppForm2;
      _form2->Closed += gcnew EventHandler( this, &MyApplicationContext::OnFormClosed );
      _form2->Closing += gcnew CancelEventHandler( this, &MyApplicationContext::OnFormClosing );
      _formCount++;
      
      // Get the form positions based upon the user specific data.
      if ( ReadFormDataFromFile() )
      {
         
         // If the data was read from the file, set the form
         // positions manually.
         _form1->StartPosition = FormStartPosition::Manual;
         _form2->StartPosition = FormStartPosition::Manual;
         _form1->Bounds = _form1Position;
         _form2->Bounds = _form2Position;
      }

      
      // Show both forms.
      _form1->Show();
      _form2->Show();
   }

   void OnApplicationExit( Object^ /*sender*/, EventArgs^ /*e*/ )
   {
      
      // When the application is exiting, write the application data to the
      // user file and close it.
      WriteFormDataToFile();
      try
      {
         
         // Ignore any errors that might occur while closing the file handle.
         _userData->Close();
      }
      catch ( Exception^ ) 
      {
      }

   }

private:

private MyApplicationContext()
{
    _formCount = 0;

    // Handle the ApplicationExit event to know when the application is exiting.
    Application.ApplicationExit += new EventHandler(this.OnApplicationExit);

    try
    {
        // Create a file that the application will store user specific data in.
        _userData = new FileStream(Application.UserAppDataPath + "\\appdata.txt", FileMode.OpenOrCreate);
    }
    catch (IOException e)
    {
        // Inform the user that an error occurred.
        MessageBox.Show("An error occurred while attempting to show the application." +
                        "The error is:" + e.ToString());

        // Exit the current thread instead of showing the windows.
        ExitThread();
    }

    // Create both application forms and handle the Closed event
    // to know when both forms are closed.
    _form1 = new AppForm1();
    _form1.Closed += new EventHandler(OnFormClosed);
    _form1.Closing += new CancelEventHandler(OnFormClosing);
    _formCount++;

    _form2 = new AppForm2();
    _form2.Closed += new EventHandler(OnFormClosed);
    _form2.Closing += new CancelEventHandler(OnFormClosing);
    _formCount++;

    // Get the form positions based upon the user specific data.
    if (ReadFormDataFromFile())
    {
        // If the data was read from the file, set the form
        // positions manually.
        _form1.StartPosition = FormStartPosition.Manual;
        _form2.StartPosition = FormStartPosition.Manual;

        _form1.Bounds = _form1Position;
        _form2.Bounds = _form2Position;
    }

    // Show both forms.
    _form1.Show();
    _form2.Show();
}

private void OnApplicationExit(object sender, EventArgs e)
{
    // When the application is exiting, write the application data to the
    // user file and close it.
    WriteFormDataToFile();

    try
    {
        // Ignore any errors that might occur while closing the file handle.
        _userData.Close();
    }
    catch { }
}

Public Sub New()
    MyBase.New()
    _formCount = 0

    ' Handle the ApplicationExit event to know when the application is exiting.
    AddHandler Application.ApplicationExit, AddressOf OnApplicationExit

    Try
        ' Create a file that the application will store user specific data in.
        _userData = New FileStream(Application.UserAppDataPath + "\appdata.txt", FileMode.OpenOrCreate)

    Catch e As IOException
        ' Inform the user that an error occurred.
        MessageBox.Show("An error occurred while attempting to show the application." +
                        "The error is:" + e.ToString())

        ' Exit the current thread instead of showing the windows.
        ExitThread()
    End Try

    ' Create both application forms and handle the Closed event
    ' to know when both forms are closed.
    _form1 = New AppForm1()
    AddHandler _form1.Closed, AddressOf OnFormClosed
    AddHandler _form1.Closing, AddressOf OnFormClosing
    _formCount = _formCount + 1

    _form2 = New AppForm2()
    AddHandler _form2.Closed, AddressOf OnFormClosed
    AddHandler _form2.Closing, AddressOf OnFormClosing
    _formCount = _formCount + 1

    ' Get the form positions based upon the user specific data.
    If (ReadFormDataFromFile()) Then
        ' If the data was read from the file, set the form
        ' positions manually.
        _form1.StartPosition = FormStartPosition.Manual
        _form2.StartPosition = FormStartPosition.Manual

        _form1.Bounds = _form1Position
        _form2.Bounds = _form2Position
    End If

    ' Show both forms.
    _form1.Show()
    _form2.Show()
End Sub

Private Sub OnApplicationExit(ByVal sender As Object, ByVal e As EventArgs)
    ' When the application is exiting, write the application data to the
    ' user file and close it.
    WriteFormDataToFile()

    Try
        ' Ignore any errors that might occur while closing the file handle.
        _userData.Close()
    Catch
    End Try
End Sub

Remarques

Vous devez attacher les gestionnaires d’événements à l’événement ApplicationExit pour effectuer les tâches requises non gérées avant que l’application cesse de s’exécuter. Vous pouvez fermer les fichiers ouverts par cette application ou supprimer les objets que le garbage collection n’a pas récupérés.

Comme il s’agit d’un événement statique, vous devez détacher tous les gestionnaires d’événements attachés à cet événement dans le ApplicationExit gestionnaire d’événements lui-même. Si vous ne détachez pas ces gestionnaires, ils restent attachés à l’événement et continuent à consommer de la mémoire.

S’applique à

Voir aussi

Exit()