问题描述
我编写了一个服务来检查应用程序是否正在运行,如果没有,它会启动它。计时器应该让服务每 30 秒运行一次。
我的代码工作不正常。它会在启动时启动多个线程,然后停止并且永远不会启动另一个实例,它只是坐在那里。
namespace ProcessRestart
{
public partial class Service1 : ServiceBase
{
static string _exeName = ConfigurationManager.AppSettings["_exeName"].ToString();
static string _exePath = ConfigurationManager.AppSettings["_exePath"].ToString();
static string _logFilePath = ConfigurationManager.AppSettings["_logFilePath"].ToString();
StringBuilder sb = new StringBuilder();
Timer timer = new Timer();
public Service1()
{
InitializeComponent();
}
protected override void OnStart(string[] args)
{
sb.AppendLine(DateTime.Now + " Service started up.");
System.IO.File.AppendAllText(_logFilePath,sb.ToString());
CheckProcess();
timer.Interval = 30000; // 30 seconds
timer.Enabled = true;
timer.Start();
sb.AppendLine(DateTime.Now + " Timer set to " + timer.Interval);
System.IO.File.AppendAllText(_logFilePath,sb.ToString());
}
protected override void OnStop()
{
timer.Stop();
timer.dispose();
timer = null;
}
private void Onelapsedtime(object source,ElapsedEventArgs e)
{
sb.AppendLine(DateTime.Now + " Service recalled.");
System.IO.File.AppendAllText(_logFilePath,sb.ToString());
}
private void CheckProcess()
{
Process[] processName = Process.GetProcessesByName(_exeName);
sb.AppendLine(DateTime.Now + " Number of instances of " + _exeName + " running:" + processName.Length);
System.IO.File.AppendAllText(_logFilePath,sb.ToString());
if (processName.Length <= 0) // Process is not running,we need to start it up
{
sb.AppendLine(DateTime.Now + " " + _exeName + " is not running,so starting it up Now.");
System.IO.File.AppendAllText(_logFilePath,sb.ToString());
Process.Start(_exePath);
}
else
{
sb.AppendLine(DateTime.Now + " " + _exeName + " is already running.");
System.IO.File.AppendAllText(_logFilePath,sb.ToString());
}
}
}
}
日志如下所示:
4/14/2021 2:52:42 PM Service started up.
4/14/2021 2:52:42 PM Service started up.
4/14/2021 2:52:42 PM Number of instances of process running: 1
4/14/2021 2:52:42 PM Service started up.
4/14/2021 2:52:42 PM Number of instances of process running: 1
4/14/2021 2:52:42 PM Process is already running.
4/14/2021 2:52:42 PM Service started up.
4/14/2021 2:52:42 PM Number of instances of process running: 1
4/14/2021 2:52:42 PM Process is already running.
4/14/2021 2:52:42 PM Timer set to 30000
有人知道我做错了什么吗?
谢谢。
解决方法
CheckProcess();
应该在 OnElapsedTime
中而不是在 OnStart
中调用。