CODEWITHSUNDEEP
c#winforms
LIKESCA
LIKESCA

Reputation: 35

How could I get the process runtime when the process terminated

private void button2_Click(object sender, EventArgs e)
        {
            Process.Start("notepad");
            for(; ; )
            {
                var pname = Process.GetProcessesByName("notepad");
                foreach (var proc in pname)
                {
                    try
                    {
                        if (pname.Length == 0) // when the process("notepad") is terminated
                        {
                            textBox1.Text = Convert.ToString(DateTime.Now - proc.StartTime);//textbox1.text = process(notepad)run time
                        }
                        break;
                    }
                    catch
                    {
                        MessageBox.Show("trouble");
                        
                    }
                    
                }
                
            }
            
        }

Um... my goal is when the notepad has terminated the runtime showed in textbox1.text; I think maybe the problem is "for and break"

Upvotes: 0

Views: 105

Answers (1)

Idle_Mind
Idle_Mind

Reputation: 39132

Instead of blocking your UI with WaitForExit(), capture the returned Process, turn on EnableRaisingEvents, then wire up the Exited event. You'll need to marshal back to the UI thread for your update though (many different ways to do that):

private void button1_Click(object sender, EventArgs e)
{
    Process P = Process.Start("notepad");
    P.EnableRaisingEvents = true;
    P.Exited += P_Exited;
}

private void P_Exited(object sender, EventArgs e)
{
    Process P = (Process)sender;
    textBox1.Invoke((MethodInvoker)delegate
    {
        textBox1.Text = (DateTime.Now - P.StartTime).ToString();
    });            
}

If you'd rather have it all within the button click handler:

private async void button1_Click(object sender, EventArgs e)
{
    button1.Enabled = false;
    Process P = Process.Start("notepad");
    await Task.Run(() => {
        P.WaitForExit();
    });
    textBox1.Text = (DateTime.Now - P.StartTime).ToString();
    button1.Enabled = true;
}

Another variation using a loop and HasExited:

private async void button1_Click(object sender, EventArgs e)
{
    button1.Enabled = false;
    Process P = Process.Start("notepad");
    await Task.Run(() =>
    {
        while (!P.HasExited)
        {
            Thread.Sleep(100);
            textBox1.Invoke((MethodInvoker)delegate {
                textBox1.Text = (DateTime.Now - P.StartTime).ToString();
            });
        }               
    });
    textBox1.Text = (DateTime.Now - P.StartTime).ToString();
    button1.Enabled = true;
}

Upvotes: 1

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