带计时器的Windows服务

Z时代
2024-01-10
分类：问答

我已经在c＃.net中使用计时器创建了Windows服务。当我在Visual Studio中调试/构建项目时，它工作正常，但安装后不执行其操作。

这可能是什么原因？

代码：

public partial class Service1 : ServiceBase
{
        FileStream fs;
        StreamWriter m_streamWriter;
        Timer tm = new Timer();
        public Service1()
        {
            InitializeComponent();
            this.ServiceName = "timerservice";
            tm.Interval = 2000;
            tm.Tick += new EventHandler(PerformOperations);
            tm.Start();
            fs = new FileStream(@"c:\mcWindowsService.txt", FileMode.OpenOrCreate, FileAccess.Write);
            m_streamWriter = new StreamWriter(fs);
            m_streamWriter.BaseStream.Seek(0, SeekOrigin.End);
        }
        private void PerformOperations(object sener, EventArgs e)
        {
            //StreamWriter swr = new StreamWriter("c:\\test_from_database.txt",true);
            try
            {
                OdbcConnection con = new OdbcConnection("DSN=liquor_data");
                OdbcDataAdapter adp = new OdbcDataAdapter("", con);
                DataSet ds = new DataSet();
                string sql = "select * from item_group";
                adp.SelectCommand.CommandText = sql;
                adp.Fill(ds, "item_group");
                foreach (DataRow dr in ds.Tables["item_group"].Rows)
                {
                    //      swr.Write(dr["group_name"].ToString() + "\t\t" + DateTime.Now.TimeOfDay.ToString() + "\n");
                    //Console.WriteLine(dr["group_name"].ToString() + "\t\t" + DateTime.Now.TimeOfDay.ToString() + "\n");
                    m_streamWriter.WriteLine(dr["group_name"].ToString() + "\t\t" + DateTime.Now.TimeOfDay.ToString() + "\n");
                }
                m_streamWriter.Flush();
            }
            catch (Exception ex)
            {
                // swr.Write("Error :"+ ex.Message + "\t\t" + DateTime.Now.TimeOfDay.ToString() + "\n"); }
            }
        }
    }

回答：

Windows Service的第一种方法并不容易。

很久以前，我写了一个C＃服务。

这是Service类的逻辑（经过测试，可以正常工作）：

namespace MyServiceApp
{
    public class MyService : ServiceBase
    {
        private System.Timers.Timer timer;
        protected override void OnStart(string[] args)
        {
            this.timer = new System.Timers.Timer(30000D);  // 30000 milliseconds = 30 seconds
            this.timer.AutoReset = true;
            this.timer.Elapsed += new System.Timers.ElapsedEventHandler(this.timer_Elapsed);
            this.timer.Start();
        }
        protected override void OnStop()
        {
            this.timer.Stop();
            this.timer = null;
        }
        private void timer_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
        {
            MyServiceApp.ServiceWork.Main(); // my separate static method for do work
        }
        public MyService()
        {
            this.ServiceName = "MyService";
        }
        // service entry point
        static void Main()
        {
            System.ServiceProcess.ServiceBase.Run(new MyService());
        }
    }
}