带定时器的 Windows 服务 [英] Windows service with timer

问题描述

我在 c#.net 中创建了一个带计时器的 Windows 服务.当我在 Visual Studio 中调试/构建项目时它工作正常，但安装后它不执行其操作.

I have created a windows service with timer in c#.net. it works fine while i debug/build the project in visual studio but it does not perform its operation after installation.

这背后的原因可能是什么?

What might be the reason behind this ?

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() + "		" + DateTime.Now.TimeOfDay.ToString() + "
");

                    //Console.WriteLine(dr["group_name"].ToString() + "		" + DateTime.Now.TimeOfDay.ToString() + "
");
                    m_streamWriter.WriteLine(dr["group_name"].ToString() + "		" + DateTime.Now.TimeOfDay.ToString() + "
");
                }

                m_streamWriter.Flush();
            }

            catch (Exception ex)
            {
                // swr.Write("Error :"+ ex.Message + "		" + DateTime.Now.TimeOfDay.ToString() + "
"); }
            }
        }
    }

推荐答案

Windows 服务的第一种方法并不容易..

First approach with Windows Service is not easy..

很久以前，我写了一个 C# 服务.

A long time ago, I wrote a C# service.

这是Service类的逻辑(经过测试，工作正常):

This is the logic of the Service class (tested, works fine):

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());
        }
    }
}

我建议您在单独的静态方法中编写真正的服务工作(为什么不，在控制台应用程序中...只需添加对它的引用)，以简化调试和清理服务代码.

I recommend you write your real service work in a separate static method (why not, in a console application...just add reference to it), to simplify debugging and clean service code.

确保间隔足够，并且只在 OnStart 和 OnStop 覆盖中写入日志.

Make sure the interval is enough, and write in log ONLY in OnStart and OnStop overrides.

希望这有帮助！

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