每10秒自动发送一次文本

Question

I have a program that gets the app name, place them on a listbox and sends them to the other window if you click the send button.

What I wanted to know is, is it possible for it to automatically send every 10 seconds after a single click on the send button? If yes, how can I possibly do that?

There's the codes, in case if it brings of any help.

private void cmd_send_Click_1(object sender, EventArgs e)
{
    String processID = "";
    String processName = "";
    String processFileName = "";
    String processPath = "";
    string hostName = System.Net.Dns.GetHostName();

    listBox1.BeginUpdate();
    try
    {
        for (int i = 0; i < listBox1.Items.Count; i++)
        {
            piis = GetAllProcessInfos();

            try
            {
               // String pno = textBox4.Text.ToString();
               // String path = textBox5.Text.ToString();
               // String name = textBox6.Text.ToString();
               // String user = textBox7.Text.ToString();
               // output.Text += "\n Sent data : " + pno + " " + user + " " + name + " " + path ;

                processID = piis[i].Id.ToString();
                processName = piis[i].Name.ToString();
                processFileName = piis[i].FileName.ToString();
                processPath = piis[i].Path.ToString();
                output.Text += "\n\nSENT DATA : \n\t" + processID + "\n\t" + processName + "\n\t" + processFileName + "\n\t" + processPath + "\n";
            }
            catch (Exception ex)
            {
                wait.Abort();
                output.Text += "Error..... " + ex.StackTrace;
            }

            NetworkStream ns = tcpclnt.GetStream();
            String data = "";
            //data = "--++" + "  " + textBox4.Text + " " + textBox5.Text + " " + textBox6.Text + " " + textBox7.Text;
            data = "--++" + "  " + processID + " " + processPath + " " + processFileName + " " + hostName;
            if (ns.CanWrite)
            {
                byte[] bf = new ASCIIEncoding().GetBytes(data);
                ns.Write(bf, 0, bf.Length);
                ns.Flush();
            }
        }
    }
    finally
    {
        listBox1.EndUpdate();
    }
}

Any help would be greatly appreciated.

Answer 1

You could place your code inside a single method, call that method initially on button click and start/stop your timer depending on it's current state.

private Timer _timer;

public Form() // Initialize timer in your form constructor
{
    InitializeComponent();

    _timer = new Timer();
    _timer.Interval = 10000; // miliseconds
    _timer.Tick += _timer_Tick; // Subscribe timer to it's tick event
}

private void _timer_Tick(object sender, EventArgs e)
{
    SendData();
}

private void cmd_send_Click_1(object sender, EventArgs e)
{
    if (!_timer.Enabled) // If timer is not running send data and start refresh interval
    {
        SendData();
        _timer.Enabled = true;
    }
    else // Stop timer to prevent further refreshing
    {
        _timer.Enabled = false;
    }
}

private void SendData()
{
    // Your code here
}

EDIT:

If you're using .NET framework 4.5 or above you can do the same thing in using async/await .

private bool keepRefreshing;
private async void cmd_send_Click_1(object sender, EventArgs e)
{
    if (keepRefreshing)
    {
        keepRefreshing = false;
        return;
    }

    keepRefreshing = true;
    while (keepRefreshing)
    {
        // Your code here
        await Task.Delay(10000);
    }
}

On button click it will send data and it will keep sending with delay of 10 seconds. When you press the button second time it will stop refreshing interval, third time it will start again and so on..

Answer 2

// Declare a timer
Timer tmr = new Timer();

tmr.Interval = 10000; // 10 second
tmr.Tick += timerHandler; // We'll write it in a bit
tmr.Start(); // The countdown is launched!

private void timerHandler(object sender, EventArgs e) {
    // Here the code what you need each 10 seconds
    tmr.Stop(); // Manually stop timer, or let run indefinitely
}

Answer 3

Their are many ways one is follow.

private void cmd_send_Click_1(object sender, EventArgs e)
{
    bool isResend=true;
    while (isResend==true)
    {
         // Put all your here
         System.Threading.Thread.Sleep(10000);
    }
}

Other ways are using Timer, etc...

Answer 4

Everyone's answer is cool, but as for me if you really need that "click" as start, i'll do it this way.

1. Initiate events for timer & background worker inside form load.
2. set timer.start(); inside click.
3. Once ticking, if backgroundworker is not busy, execute background worker.
4. Ensure that you don't directly set label1.text = "send some works here." inside the background worker, it will cause error.

Hope this helps.