timer

问题 The documentation of System.Threading.Timer says that I should keep a live reference for it to avoid it being garbage collected. But where should I do that? My main is very simple that I don't know where to keep the reference: class Program { static void Main() { new System.Threading.Thread(myThreadStart).Start(); new System.Threading.Timer(myTimerCallback, new MyStateObject(), 0, 5000); } } I thought about keeping the reference in a static field in the Program class, assuming that static

问题 Currently I'm getting the execution wall time of my program in seconds by calling: time_t startTime = time(NULL); //section of code time_t endTime = time(NULL); double duration = difftime(endTime, startTime); Is it possible to get the wall time in milliseconds ? If so how? 回答1: If you're on a POSIX-ish machine, use gettimeofday() instead; that gives you reasonable portability and microsecond resolution. Slightly more esoteric, but also in POSIX, is the clock_gettime() function, which gives

问题 This question already has answers here : Closed 7 years ago . Possible Duplicate: Suggestions for a Cron like scheduler in Python? What would be the most pythonic way to schedule a function to run periodically as a background task? There are some ideas here, but they all seem rather ugly to me. And incomplete. The java Timer class has a very complete solution. Anyone know of a similar python class? 回答1: There is a handy event scheduler that might do what you need. Here's a link to the

问题 I want to use a timer in my simple .NET application written in C#. The only one I can find is the Windows.Forms.Timer class. I don't want to reference this namespace just for my console application. Is there a C# timer (or timer like) class for use in console applications? 回答1: System.Timers.Timer And as MagicKat says: System.Threading.Timer You can see the differences here: http://intellitect.com/system-windows-forms-timer-vs-system-threading-timer-vs-system-timers-timer/ And you can see

问题 Using C#, how may I get the time remaining (before the elapse event will occur) from a System.Timers.Timer object? In other words, let say I set the timer interval to 6 hours, but 3 hours later, I want to know how much time is remaining. How would I get the timer object to reveal this time remaining? 回答1: The built-in timer doesn't provide the time remaining until elapse. You'll need to create your own class which wraps a timer and exposes this info. Something like this should work. public

问题 Im building an automatic refreshing comment section for my website using jQuery .load. So I am using a javascript 'setTimeout' timer to check for new comments. But after doing some stuff like changing comment pages or deleting (all using ajax), a few old timers keep running, even though I used clearTimeout before loading new ajax content. Is there some way to clear ALL javascript timers when I load new ajax content? 回答1: There's no general function in javascript that allows you to clear all

问题 Suppose we have a timer which runs every 10 minutes. What if the cycle of its processing takes more than 10 minutes. Does a new thread starts for that? Will it interrupt its current operation? What if a single object is mutated inside the timer? Sorry if I do not mention any code for that because the problem is clear and also I want to know the complete answer from the viewpoint of a multi-threaded programming geek rather than finding a loose answer by trying to test it via a sample

问题 Hy! So I'm starting with netbeans java gui development and I have run into this problem: I have made a window with a button and a text field. When the user clicks the button I want the text field to start typing itself with a delay. So for example: textfield.text=h wait(1) sec textfield.text=he wait(1) sec textfield.text=hel wait(1) sec textfield.text=hell wait(1) sec textfield.text=hello I have already tried with Thread.sleep() , but in the example above it waits 4 seconds or so and after

问题 Bellow is the code for the simplest GUI countdown. Can the same be done in a shorter and more elegant way with the usage of the Swing timer? import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.SwingUtilities; public class CountdownNew { static JLabel label; // Method which defines the appearance of the window. public static void showGUI() { JFrame frame = new JFrame("Simple Countdown"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); label = new JLabel("Some Text");

问题 I use the system.timers.timer for my service. Now I build a test-form in which I use it too. In the timer_Elapsed Event I do some work and want to stop the timer it need (xxx ms) and write it on the form control to show. But when I access the listview, I get an cross thread error. Any ideas? 回答1: If you want to acces a control from a thread other than the main UI thread, you need to use the Invoke method on the control you want to access. 回答2: Your method should look like: public void foo(int