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Application.Run, méthode (ApplicationContext)

Commence à exécuter une boucle de messages d'application standard sur le thread en cours, avec ApplicationContext.

Espace de noms : System.Windows.Forms
Assembly : System.Windows.Forms (dans system.windows.forms.dll)

public static void Run (
	ApplicationContext context
)
public static void Run (
	ApplicationContext context
)
public static function Run (
	context : ApplicationContext
)

Paramètres

context

ApplicationContext dans lequel l'application est exécutée.

Type d'exceptionCondition

InvalidOperationException

Une boucle de messages principale est déjà en cours d'exécution sur ce thread.

La boucle de messages s'exécute jusqu'à ce que Exit ou ExitThread soit appelé ou que l'événement ThreadExit soit déclenché sur l'objet de contexte.

L'exemple affiche deux formulaires et quitte l'application lorsque les deux formulaires sont fermés. Lorsque l'application démarre et s'arrête, la position de chaque formulaire est mémorisée. Cet exemple montre comment utiliser ApplicationContext avec la méthode Application.Run(context), pour afficher plusieurs formulaires au démarrage de l'application.

La classe MyApplicationContext hérite de ApplicationContext, assure le suivi lorsque chaque formulaire est fermé, puis quitte le thread en cours lorsque les formulaires sont tous fermés. La classe stocke les positions de chaque formulaire pour l'utilisateur. Les données de position du formulaire sont stockées dans un fichier intitulé Appdata.txt créé à l'emplacement déterminé par UserAppDataPath. La méthode Main appelle Application.Run(context) pour démarrer l'application en raison de ApplicationContext.

Le code des formulaires AppForm1 et AppForm2 n'est pas indiqué pour des raisons de concision. Consultez la vue d'ensemble de la classe ApplicationContext pour obtenir la totalité du code.

// The class that handles the creation of the application windows
class MyApplicationContext : ApplicationContext {

    private int formCount;
    private AppForm1 form1;
    private AppForm2 form2;

    private Rectangle form1Position;
    private Rectangle form2Position;

    private FileStream userData;

    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 {}
    }

    private void OnFormClosing(object sender, CancelEventArgs e) {
        // When a form is closing, remember the form position so it
        // can be saved in the user data file.
        if (sender is AppForm1) 
            form1Position = ((Form)sender).Bounds;
        else if (sender is AppForm2)
            form2Position = ((Form)sender).Bounds;
    }

    private void OnFormClosed(object sender, EventArgs e) {
        // When a form is closed, decrement the count of open forms.

        // When the count gets to 0, exit the app by calling
        // ExitThread().
        formCount--;
        if (formCount == 0) {
            ExitThread();
        }
    }

    private bool WriteFormDataToFile(){
        // Write the form positions to the file.
        UTF8Encoding encoding = new UTF8Encoding();

        RectangleConverter rectConv = new RectangleConverter();
        String form1pos = rectConv.ConvertToString(form1Position);
        String form2pos = rectConv.ConvertToString(form2Position);

        byte[] dataToWrite = encoding.GetBytes("~" + form1pos + "~" + form2pos);

        try {
            // Set the write position to the start of the file and write
            userData.Seek(0,SeekOrigin.Begin);
            userData.Write(dataToWrite, 0, dataToWrite.Length);
            userData.Flush();

            userData.SetLength(dataToWrite.Length);
            return true;

        } catch {
            // An error occurred while attempting to write, return false.
            return false;
        }

    }

    private bool ReadFormDataFromFile(){
        // Read the form positions from the file.
        UTF8Encoding encoding = new UTF8Encoding();
        String data;

        if (userData.Length != 0) {
            byte[] dataToRead = new Byte[userData.Length];

            try {
                // Set the read position to the start of the file and read.
                userData.Seek(0, SeekOrigin.Begin);
                userData.Read(dataToRead, 0, dataToRead.Length);

            } catch (IOException e) {
                String errorInfo = e.ToString();
                // An error occurred while attempt to read, return false.
                return false;
            }

            // Parse out the data to get the window rectangles
            data = encoding.GetString(dataToRead);

            try {
                // Convert the string data to rectangles
                RectangleConverter rectConv = new RectangleConverter();
                String form1pos = data.Substring(1,data.IndexOf("~",1)-1);

                form1Position = (Rectangle)rectConv.ConvertFromString(form1pos);

                String form2pos = data.Substring(data.IndexOf("~",1)+1);
                form2Position = (Rectangle)rectConv.ConvertFromString(form2pos);

                return true;

            } catch {
                // Error occurred while attempting to convert the rectangle data.
                // Return false to use default values.
                return false;
            }

        } else {
            // No data in the file, return false to use default values.
            return false;
        }
    }        
    
    [STAThread]
    static void Main(string[] args) {
        
        // Create the MyApplicationContext, that derives from ApplicationContext,
        // that manages when the application should exit.

        MyApplicationContext context = new MyApplicationContext();

        // Run the application with the specific context. It will exit when
        // all forms are closed.
        Application.Run(context);

    }
}

// The class that handles the creation of the application windows
class MyApplicationContext extends ApplicationContext
{
    private int formCount;
    private AppForm1 form1;
    private AppForm2 form2;
    private Rectangle form1Position;
    private Rectangle form2Position;
    private FileStream userData;

    private MyApplicationContext()
    {
        formCount = 0;

        // Handle the ApplicationExit event to know 
        // when the application is exiting.
        Application.add_ApplicationExit(new EventHandler(
            this.OnApplicationExit));
        try {
            // Create a file that the application will store 
            // user specific data in.
            userData = new FileStream(Application.get_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.add_Closed(new EventHandler(OnFormClosed));
        form1.add_Closing(new CancelEventHandler(OnFormClosing));
        formCount++;
        form2 = new AppForm2();
        form2.add_Closed(new EventHandler(OnFormClosed));
        form2.add_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.set_StartPosition(FormStartPosition.Manual);
            form2.set_StartPosition(FormStartPosition.Manual);
            form1.set_Bounds(form1Position);
            form2.set_Bounds(form2Position);
        }

        // Show both forms.
        form1.Show();
        form2.Show();
    } //MyApplicationContext

    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 (System.Exception exp) {
        }
    } //OnApplicationExit

    private void OnFormClosing(Object sender, CancelEventArgs e)
    {
        // When a form is closing, remember the form position so it
        // can be saved in the user data file.
        if (sender instanceof AppForm1) {
            form1Position = ((Form)sender).get_Bounds();
        }
        else {
            if (sender instanceof AppForm2) {
                form2Position = ((Form)sender).get_Bounds();
            }
        }
    } //OnFormClosing

    private void OnFormClosed(Object sender, EventArgs e)
    {
        // When a form is closed, decrement the count of open forms.
        // When the count gets to 0, exit the app by calling
        // ExitThread().
        formCount--;
        if (formCount == 0) {
            ExitThread();
        }
    } //OnFormClosed

    private boolean WriteFormDataToFile()
    {
        // Write the form positions to the file.
        UTF8Encoding encoding = new UTF8Encoding();
        RectangleConverter rectConv = new RectangleConverter();
        String form1Pos = rectConv.ConvertToString(form1Position);
        String form2Pos = rectConv.ConvertToString(form2Position);
        ubyte dataToWrite[] = encoding.GetBytes("~" + form1Pos + "~" 
            + form2Pos);

        try {
            // Set the write position to the start of the file and write
            userData.Seek(0, SeekOrigin.Begin);
            userData.Write(dataToWrite, 0, dataToWrite.length);
            userData.Flush();
            userData.SetLength(dataToWrite.length);
            return true;
        }
        catch (System.Exception exp) {
            // An error occurred while attempting to write, return false.
            return false;
        }
    } //WriteFormDataToFile

    private boolean ReadFormDataFromFile()
    {
        // Read the form positions from the file.
        UTF8Encoding encoding = new UTF8Encoding();
        String data;

        if (userData.get_Length() != 0) {
            ubyte dataToRead[] = new ubyte[(int)userData.get_Length()];

            try {
                // Set the read position to the start of the file and read.
                userData.Seek(0, SeekOrigin.Begin);
                userData.Read(dataToRead, 0, dataToRead.length);
            }
            catch (IOException e) {
                String errorInfo = e.ToString();

                // An error occurred while attempt to read, return false.
                return false;
            }

            // Parse out the data to get the window rectangles
            data = encoding.GetString(dataToRead);
            try {
                // Convert the string data to rectangles
                RectangleConverter rectConv = new RectangleConverter();
                String form1Pos = data.Substring(1, data.IndexOf("~", 1) - 1);
                form1Position = 
                    (Rectangle)(rectConv.ConvertFromString(form1Pos));

                String form2Pos = data.Substring(data.IndexOf("~", 1) + 1);
                form2Position = 
                    (Rectangle)(rectConv.ConvertFromString(form2Pos));
                return true;
            }
            catch (System.Exception exp) {
                // Error occurred while attempting to convert the rectangle data.
                // Return false to use default values.
                return false;
            }
        }
        else {
            // No data in the file, return false to use default values.
            return false;
        }
    } //ReadFormDataFromFile

    /** @attribute STAThread()
     */
    public static void main(String[] args)
    {
        // Create the MyApplicationContext, that derives from
        // ApplicationContext, that manages when the application should exit.
        MyApplicationContext context = new MyApplicationContext();

        // Run the application with the specific context. It will exit when
        // all forms are closed.
        Application.Run(context);
    } //main 
} //MyApplicationContext

Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile pour Pocket PC, Windows Mobile pour Smartphone, Windows Server 2003, Windows XP Édition Media Center, Windows XP Professionnel Édition x64, Windows XP SP2, Windows XP Starter Edition

Le .NET Framework ne prend pas en charge toutes les versions de chaque plate-forme. Pour obtenir la liste des versions prises en charge, consultez Configuration requise.

.NET Framework

Prise en charge dans : 2.0, 1.1, 1.0

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