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在windows服务中使用线程异步执行C#方法_C#_Multithreading_Windows Services - Fatal编程技术网

在windows服务中使用线程异步执行C#方法

在windows服务中使用线程异步执行C#方法,c#,multithreading,windows-services,C#,Multithreading,Windows Services,我有一个windows服务,每10秒运行一次以执行read方法。Read方法使用构造函数中提供的连接url连接到远程服务器。 如果远程服务器未能响应,它将抛出错误并进行捕获。我们如何使线程重新开始 class PMTicketsService { private Timer _serviceTimer; private TimerCallback _timerDelegate; public PMTicketsService() { Ini

我有一个windows服务,每10秒运行一次以执行read方法。Read方法使用构造函数中提供的连接url连接到远程服务器。 如果远程服务器未能响应,它将抛出错误并进行捕获。我们如何使线程重新开始

class PMTicketsService
{
    private Timer _serviceTimer;
    private TimerCallback _timerDelegate;

    public PMTicketsService()
    {   
        InitializeComponent();
    }

    protected override void OnStart(string[] args)
    {
        // Set the method to execute when the timer executes.
        _timerDelegate = new TimerCallback(Receive);

        // Create timer and attach our method delegate to it
        _serviceTimer = new Timer(_timerDelegate, null, 1000, 10000);
    }

    public void Receive(object state)
    {
        ABC abc = new ABC(Url);
        ABC abc1 = new ABC(Url1);

        /* Create the thread object, passing in the abc.Read() method
        via a ThreadStart delegate. This does not start the thread. */
        Thread oThread = new Thread(new ThreadStart(abc.Read());
        Thread oThread1 = new Thread(new ThreadStart(abc1.Read());

        // Start the thread
        oThread.Start();
        oThread1.Start();

        oThread.Join();
        oThread1.Join();
    }
}

class ABC
{
    public string strUrl;

    public ABC(string url)
    {
        strUrl = url;
    }

    public void Read()
    {
        try
        {
            // Code to use the connectionurl to access a remote server
        }
        catch (Exception ex)
        {
            // If the connection url fails to respond, how do we make thread start again?
        }
    }
}

为什么要开始另一个线程?启动/停止线程是一项昂贵的操作,您最好保持现有线程处于打开状态,并不断尝试连接(可能中间有睡眠)。您已经有了防止线程崩溃的try/catch。只需在一段时间内包装try/catch(!done),并在成功连接后将done设置为true


您可能还想添加一些代码,这样,如果您无法连续连接X次(可能是5次),那么您将停止尝试,或者增加连接尝试之间的超时时间。

以后,您应该提交实际编译的示例代码。我拿走了你所有的东西,把它清理干净,去掉了不必要的计时器,并以一种能满足你需要的方式来构建它。在下面的代码中,您的读取方法将继续运行,直到您将
done
设置为
true

    protected override void OnStart(string[] args)
    {
        try
        {
            ABC abc = new ABC("www.abc.com");

            // Create the thread object, passing in the abc.Read() method
            Thread oThread = new Thread(new ThreadStart(abc.Read));

            // Start the thread
            oThread.Start();
        }
        catch (Exception)
        {

        }
    }

    public class ABC
    {
        string strUrl = "";

        public ABC(string url)
        {
            strUrl = url;
        }

        public void Read()
        {
            bool done = false;

            while (!done)
            {
                try
                {
                    //Code to use the connectionurl to access a remote server
                    //Use strUrl in here
                }
                catch (Exception)
                {
                    //Wait 10 seconds before trying again
                    Thread.Sleep(10000);
                }

                //On success, set done to true
                done = true;
            }
        }
    }

这段代码可能需要一些清理…@James。如何检查线程中的异常并启动另一个线程。你有代码示例吗?我刚刚非常准确地告诉你需要做什么,而你需要做的与线程无关;所有的线程工作都已经完成了。您需要定义一个布尔值,添加一个while循环,可能还需要添加一个Thread.Sleep。这些是您需要添加的唯一代码行,我已经告诉您需要在哪里添加它们。我完全相信你,你可以把它变成源代码,而不需要从这里的人那里复制/粘贴它。