How can I run a timer for 10 minutes and then disa

问题:

I took help from :http://forum.codecall.net/topic/65434-c-working-with-timers/ (in it a decremented counter is used, but it's not working in my app)

I have some text field and two buttons: submit and update. I have implemented a timer from toolbar to update button.

I wanted this timer to run for 10 minutes and then disable the update button. But presently it's running for just 2 minutes.

Buttons Code:

<asp:Button ID="Btnsave" runat="server" CssClass="bt3dbuttons" 
    onclick="Btnsave_Click" OnClientClick="return confirm('Data Submitted')" 
    Text="Submit" Width="77px" />

<asp:Timer ID="Timer2" runat="server" ontick="Timer2_Tick">
</asp:Timer>
<asp:Button ID="Butnupdate" runat="server" CssClass="btupbuttons" 
    onclick="Btnupdate_Click" Text="Update" visible="false" Width="85px" />

Here is the code for timer:

private System.Timers.Timer aTimer = new System.Timers.Timer(600000)
                                                { AutoReset = false };
protected void Timer2_Tick(object sender, EventArgs e)
{    
   aTimer = new System.Timers.Timer(600000);
   aTimer.Interval = 600000;
   double counter = aTimer.Interval;

   counter++;
   if (counter >= 600000)
   {    
       Butnupdate.Enabled = false;
       MessageBox.Show("Time Up!");
   }
}

Code for Update Button:

protected void Btnupdate_Click(object sender, EventArgs e) 
{

    string id = Id.Text.Trim();
    string name = Name.Text;
    string project = Project.Text;
    string result = Total.Text;

    using (SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["CM_Connection"].ConnectionString))
    {
        SqlCommand cmd = new SqlCommand();
        cmd.Connection = con;

        try
        {
            //lets check that the user typed the first number
            if (Viva.Text.Length > 1)
            {
                VivaLabel.Text = "Please enter a valid number to add.";
                return;
            }

            //lets check that the user typed the second number
            else if (Presentation.Text.Length > 1)
            {
                PresentationLabel.Text = "Please enter a valid number to add.";
                return;
            }
            else if (Confidence.Text.Length > 1)
            {
                ConfidenceLabel.Text = "Please enter a valid number to add.";
                return;
            }

            else if (System.Text.Length > 1)
            {
                SystemLabel.Text = "Please enter a valid number to add.";
                return;
            }
            //Now we have valid inputs
            //Lets put them into integer values

            int number1 = int.Parse(Viva.Text);
            int number2 = int.Parse(Presentation.Text);
            int number3 = int.Parse(Confidence.Text);
            int number4 = int.Parse(System.Text);
            //Now lets add the numbers
            int total = number1 + number2 + number3 + number4;

            //lets place it into the TextBox3
            Total.Text = total.ToString();

            //  cmd.CommandType = CommandType.StoredProcedure;
            cmd.CommandText = @"UPDATE Result SET Name = @name, Project = @project, Result = @result WHERE ID = @id";
            con.Open();

            cmd.Parameters.AddWithValue("@id", Id.Text.ToString());
            cmd.Parameters.AddWithValue("@name ", Name.Text.ToString());
            cmd.Parameters.AddWithValue("@project ", Project.Text.ToString());
            cmd.Parameters.AddWithValue("@result ", Total.Text.ToString());
            cmd.ExecuteNonQuery();
        }

        catch (Exception ex1)
        {
            //Report error to user in the bottom Label
            MessageBox.Show(ex1.Message);
        }
    }
}

回答1:

Use this code as a guide

public class Timer1
{
    private static System.Timers.Timer aTimer;

    public static void Main()
    {
        // Create a timer with a ten second interval.
        aTimer = new System.Timers.Timer(600000);

        // Hook up the Elapsed event for the timer.
        aTimer.Elapsed += new ElapsedEventHandler(OnTimedEvent);

        // Set the Interval to 10 minutes 
        aTimer.Interval = 600000;
        aTimer.Enabled = true;

        Console.WriteLine("Press the Enter key to exit the program.");
        Console.ReadLine();

        // If the timer is declared in a long-running method, use 
        // KeepAlive to prevent garbage collection from occurring 
        // before the method ends. 
        GC.KeepAlive(aTimer);
    }

    // Specify what you want to happen when the Elapsed event is  
    // raised. 
    private static void OnTimedEvent(object source, ElapsedEventArgs e)
    {
        Butnupdate.Enabled = false;
        MessageBox.Show("Time Up!");
    }
}

Example taken from

http://msdn.microsoft.com/en-us/library/system.timers.timer.aspx

回答2:

Set the Interval Property of the asp:Timer this will then postback the page and call the ontick handler

<asp:Timer ID="Timer2" runat="server" ontick="Timer2_Tick" Interval="60000">
        </asp:Timer>

http://msdn.microsoft.com/en-us/library/system.web.ui.timer.interval.aspx

I'm not sure what you are trying to do with the System.Timers.Timer on the server code it wont get used unless you page processing takes an extraordinary long time.

回答3:

Your timer may be getting garbage collected if it is a long-running method instead of as part of the class, I cannot tell by the code posted.

Read the Timer.Interval Property documentation, which also has a sample of how to implement a timer.

回答4:

According to the System.Timers.Timer class documentation, it fires up an event once the the defined time is elapsed, in an asynchronous way.

The setup code would look like this:

        var aTimer = new System.Timers.Timer(10 * 60 * 1000);
        aTimer.Elapsed += new ElapsedEventHandler(OnTimedEvent);
        aTimer.Enabled = true;

And the event itself like this:

    private static void OnTimedEvent(object source, ElapsedEventArgs e)
    {
        //Do your event management here.
    }

Hope it works for you.

回答5:

Problem has been solved by following code:

Create the timer ( default can be used from toolbox) set the timer interval property

<asp:Timer ID="Timer2" runat="server" ontick="Timer2_Tick" 
            Interval="600000">
        </asp:Timer>

For reference see: http://msdn.microsoft.com/en-us/library/system.web.ui.timer.interval.aspx

Create the event handler for timer :

protected void Timer2_Tick(object sender, EventArgs e)
        {

            if (timeLeft > 0)
            {
                // Display the new time left 
                // by updating the Time Left label.
                timeLeft = timeLeft - 1;
                Label1.Text = timeLeft + " seconds";
            }
            else
            {
                // If the user ran out of time, stop the timer, show 
                // a MessageBox, and fill in the answers.
                Timer2.Enabled = false;
                Label1.Text = "Time's up!";
                MessageBox.Show("You didn't finish in time.", "Sorry");

                Butnupdate.Enabled = false;
            }

use the following in the button on which you want your timer to start:

timeLeft = 600;
                    Label1.Text = DateTime.Now.ToString("HH:mm:ss tt");
                    Timer2.Enabled = true;

If you want to show the current system time or current time use

Label1.Text = DateTime.Now.ToString("HH:mm:ss tt");

I declared it into label and how to do it and above please have a look here: http://msdn.microsoft.com/en-us/library/dd492144.aspx?cs-save-lang=1&cs-lang=csharp#code-snippet-2

Here we go a timer to disable button after 10 minutes :) Hopes it helps somebody as well :)