如何在计时器ASP.NET MVC上调用函数

Question

我需要调用timer上的函数(比如onTickTack()函数)并在ASP.NET MVC项目中重新加载一些信息.我知道有几种方法可以做到这一点,但你认为哪一种最好？

注意:该函数应该只从一个地方调用,每隔X分钟调用一次,直到应用程序启动.

编辑1:重新加载一些信息 - 例如我在缓存中有一些东西,我想在计时器上更新它 - 在某个时间每天一次.

Answer 1

这个问题的答案在很大程度上取决于你在ASP.NET MVC项目中重新加载一些信息是什么意思.这不是一个明确陈述的问题,因此,显然,它不能有明确的答案.

因此,如果我们假设您想要定期轮询一些控制器操作并更新视图上的信息,您可以使用setInterval javascript函数通过发送AJAX请求并更新UI来定期轮询服务器:

window.setInterval(function() {
    // Send an AJAX request every 5s to poll for changes and update the UI
    // example with jquery:
    $.get('/foo', function(result) {
        // TODO: use the results returned from your controller action
        // to update the UI
    });
}, 5000);

另一方面,如果您定期在服务器上执行某项任务,则可以使用 RegisterWaitForSingleObject方法,如下所示:

var waitHandle = new AutoResetEvent(false);
ThreadPool.RegisterWaitForSingleObject(
    waitHandle, 
    // Method to execute
    (state, timeout) => 
    {
        // TODO: implement the functionality you want to be executed
        // on every 5 seconds here
        // Important Remark: This method runs on a worker thread drawn 
        // from the thread pool which is also used to service requests
        // so make sure that this method returns as fast as possible or
        // you will be jeopardizing worker threads which could be catastrophic 
        // in a web application. Make sure you don't sleep here and if you were
        // to perform some I/O intensive operation make sure you use asynchronous
        // API and IO completion ports for increased scalability
    }, 
    // optional state object to pass to the method
    null, 
    // Execute the method after 5 seconds
    TimeSpan.FromSeconds(5), 
    // Set this to false to execute it repeatedly every 5 seconds
    false
);

如果您的意思是其他内容,请不要犹豫,为您的问题提供更多详细信息.

Answer 2

您可以在Gllo.asax的OnApplicationStart事件中使用Timer类...

public static System.Timers.Timer timer = new System.Timers.Timer(60000); // This will raise the event every one minute.
.
.
.

timer.Enabled = true;
timer.Elapsed += new System.Timers.ElapsedEventHandler(timer_Elapsed);
.
.
.

static void timer_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
{
  // Do Your Stuff
}