【C#】一个简单的windows服务程序

Thread th;
public Service1()
{
InitializeComponent();
}

protected override void OnStart(string[] args)
{
ThreadStart ts = new ThreadStart(task);
th = new Thread(ts);
th.IsBackground = true;
th.Start();

}

private void task()
{
while (true)
{
string path = @"c:\1.txt";
Thread.Sleep(3000);
if (File.Exists(path))
{
using (StreamWriter sw= File.AppendText(path))
{
sw.WriteLine(DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss"));
}
}
else
{
File.CreateText(path);
}

}
}

protected override void OnStop()
{
th.Abort();
}