c # error when calling a Thread class from my main class

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c # error when calling a Thread class from my main class

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#1 by (4 votes)

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The thread consists of moving the gif

    private void btn_start_Click(object sender, EventArgs e)
    {
        if (nuevo == true)//si es la priemra vez que has pulsado el boton
        {

            //pedir datos del personaje
            hilo_motor_GIF hilo = new hilo_motor_GIF(muñecoWalker,2);
            hilo.arrancar();
            nuevo = false;
            btn_start.Text = "Seguir aventura";
        }

        else {
            //accionar el personaje

            //accion();
            hilo_motor_GIF hilo = new hilo_motor_GIF(muñecoWalker, 2);
            hilo.arrancar();
        }
    }

thread class

    using System;
using System.Threading;
using System.Windows.Forms;


public class hilo_motor_GIF
{
    Thread hilo;
    int segundos;
    PictureBox gif;

    public hilo_motor_GIF(PictureBox gif, int segundos)
    {

        this.segundos = segundos;
        this.gif = gif;

        hilo = new Thread(go);
    }

    private  void giffOn() {
        this.gif.Enabled = true;
    }

    private void giffOff() {
        this.gif.Enabled = false;
    }

    public void go() {

        try
        {
            giffOn();
            Thread.Sleep(segundos * 1000);
            giffOff();

        }
        catch (Exception e) {
            Console.WriteLine("Error: "+e);
        }



    }

    public void arrancar() {
        this.hilo.Start();
    }
}

OUTPUT

Exception produced: 'System.InvalidOperationException' in System.Windows.Forms.dll Error: System.InvalidOperationException: Invalid operation through threads: The 'dollWalker' control was accessed from a subprocess other than the one in which it was created. in System.Windows.Forms.Control.get_Handle () in System.Windows.Forms.Control.OnEnabledChanged (EventArgs e) in System.Windows.Forms.PictureBox.OnEnabledChanged (EventArgs e) in System.Windows.Forms.Control.set_Enabled (Boolean value) in thread_motor_GIF.giffOn () in H: \ PROJECTS C # \ CaminanteRandom \ CaminanteRandom \ hilo_motor_GIF.cs: line 21 in hilo_motor_GIF.go () in H: \ PROJECTS C # \ CaminanteRandom \ CaminanteRandom \ hilo_motor_GIF.cs: line 32 Subprocess 0x1154 ended with code 0 (0x0). The program '[1232] CaminanteRandom.exe' ended with code 0 (0x0).

c# windows-forms hilos

asked by josanangel 04.08.2018 в 20:20

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1 answer

Update a div with ajax when there is a change Error in JAVASCRIPT

score 4 · Answer 1

To modify them from a different thread you need to use Invoke. Invoke executes the last method as delegate in the same control thread.

Example:

private  void giffOn() {
{
    this.gif.Invoke((MethodInvoker)delegate () { this.gif.Enabled = true; });
}

Alternatively you can use the BackgroundWorker component that allows you to do the same in a simpler way.

BackgroundWorker includes the event ProgressChanged running on the thread of the component so you do not have to use Invoke and the method ReportProgress to call the event.