Doubt with Time Asp.net mvc

Question

I have a timer that I am testing and the same returns me an error:

An Exception of type 'System.Web.Httpexception' occurred in System.Web.dll but was not handled in user code

Additional information: Answer not available in this context.

private static System.Timers.Timer timer;

protected void btnGerarArquivo_Click(object sender, EventArgs e)
{
    timer = new System.Timers.Timer();
    timer.Interval = 60;
    timer.Elapsed += new ElapsedEventHandler(Teste);
    timer.Enabled = true;
}

public void Teste(object source, ElapsedEventArgs e)
{
    try
    {
        Response.Write("teste");
        timer.Enabled = false;
    }
    catch (Exception ex)
    {
        Response.Write("erro " + ex.Message);
    }
}

After the adjustments was this way, it no longer updates the screen:

     System.Threading.Timer tTime;

        protected void btnGerarArquivo_Click(object sender, EventArgs e)
        {
            tTime = new System.Threading.Timer(new TimerCallback(Teste), null, 15000, 6000);
        }



        public void Teste(object sender)
        {
            horaCriacaoPagina.Text = "Hora atualizada : " + DateTime.Now.ToLongTimeString();
        }

Answer 1

Your problem is that your project is Web and you are trying to use a Timer class that has no support for this private static System.Timers.Timer timer; when you should use System.Web.UI.Timer.

Your mistake is exactly when you try to use Response, if you use this. Response, you will see that there are several errors in your class and one of them is.

'this. Response' threw an Exception of type 'System.Web.Httpexception'

Remember that the . NET Framework class library includes four classes called Timer, each of which offers different functionality:

• System.Timers.Timer (This topic): fires an event at regular intervals. The class is intended for use as a server based on or service component in a multithreaded environment; it has no user interface and is not visible at runtime.
• System.Threading.Timer: performs a single call return method in a thread pool at regular intervals. The return method of call is set when timer is instantiated and cannot be changed. Like the System.Timers.Timer class, this class is intended for for use as a server-based component or service in a multithreaded environment; it has no user interface and is not visible at runtime.
• System.Windows.Forms.Timer: a component of Windows Forms that fires an event at regular intervals. The component does not have no user interface and is designed for use in a single thread.
• System.Web.UI.Timer: an ASP.NET component that performs postbacks asynchronous or synchronous web page at regular intervals.