总结.Net MVC实现长轮询实例(2)-木庄网络博客

2022-01-21 04:39:02 网络 .NET 百度已收录

我们后台Controller要使用异步，继承AsyncController基类

public class DateTimeController : AsyncController
  {
    public void GetTimeAsync()
    {
      //计时器，5秒种触发一次Elapsed事件    
      System.Timers.Timer timer = new System.Timers.Timer(5000);
      //告诉.NET接下来将进行一个异步操作    
      AsyncManager.OutstandingOperations.Increment();
      //订阅计时器的Elapsed事件  
      timer.Elapsed += (sender, e) =>
      { //保存将要传递给GetTimeCompleted的参数        
        AsyncManager.Parameters["nowdate"] = e.SignalTime;
        //告诉ASP.NET异步操作已完成，进行GetTimeCompleted方法的调用        
        AsyncManager.OutstandingOperations.Decrement();
      };
      //启动计时器    
      timer.Start();
    }
    public ActionResult GetTimeCompleted(DateTime nowdate)
    {
      return Json(new { date = nowdate.ToString("HH:mm:ss") + " Welecom " }, JsonRequestBehavior.AllowGet);
    }
  }