Windows Service that runs periodically and once a day at specific time using C#

Windows Service that runs periodically and once a day at specific time using C#

Windows Service that runs periodically at regular intervals and as well as once a day at specific time of day.

The Windows service will support two modes
1. Daily mode: Windows Service will execute a task at specific time of day.
2. Interval mode: Windows Service execute a task at regular intervals after some delay.

Add the AppSettings to the App.Config file

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
    <startup> 
        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5" />
    </startup>
<appSettings>
        <add key ="Mode" value ="Daily"/>
        <add key ="IntervalMinutes" value ="1"/>
        <add key ="ScheduledTime" value ="15:45"/>
    </appSettings>
</configuration>

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.ServiceProcess;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Configuration;
//using System.Timers;

namespace Services
{
    public partial class Service1 : ServiceBase
    {
        public Service1()
        {
            InitializeComponent();
        }
        protected override void OnStart(string[] args)
        {
            this.WriteToFile("Service started {0}");
            this.ScheduleService();
        }

        protected override void OnStop()
        {
            this.WriteToFile("Service stopped {0}");
            this.Schedular.Dispose();
        }

        private Timer Schedular;

        public void ScheduleService()
        {
            try
            {
                Schedular = new Timer(new TimerCallback(SchedularCallback));
                string mode = ConfigurationManager.AppSettings["Mode"].ToUpper();
                this.WriteToFile("Service Mode: " + mode + " {0}");                
                DateTime scheduledTime = DateTime.MinValue;
                if (mode == "DAILY")
                {
                    //Get the Scheduled Time from AppSettings.
                    scheduledTime = DateTime.Parse(System.Configuration.ConfigurationManager.AppSettings["ScheduledTime"]);
                    if (DateTime.Now > scheduledTime)
                    {
                        //If Scheduled Time is passed set Schedule for the next day.
                        scheduledTime = scheduledTime.AddDays(1);
                    }
                }

                if (mode.ToUpper() == "INTERVAL")
                {
                    //Get the Interval in Minutes from AppSettings.
                    int intervalMinutes = Convert.ToInt32(ConfigurationManager.AppSettings["IntervalMinutes"]);

                    //Set the Scheduled Time by adding the Interval to Current Time.
                    scheduledTime = DateTime.Now.AddMinutes(intervalMinutes);
                    if (DateTime.Now > scheduledTime)
                    {
                        //If Scheduled Time is passed set Schedule for the next Interval.
                        scheduledTime = scheduledTime.AddMinutes(intervalMinutes);
                    }
                }

                TimeSpan timeSpan = scheduledTime.Subtract(DateTime.Now);
                string schedule = string.Format("{0} day(s) {1} hour(s) {2} minute(s) {3} seconds(s)", timeSpan.Days, timeSpan.Hours, timeSpan.Minutes, timeSpan.Seconds);

                this.WriteToFile("Simple Service scheduled to run after: " + schedule + " {0}");

                //Get the difference in Minutes between the Scheduled and Current Time.
                int dueTime = Convert.ToInt32(timeSpan.TotalMilliseconds);

                //Change the Timer's Due Time.
                Schedular.Change(dueTime, Timeout.Infinite);
            }
            catch (Exception ex)
            {
                WriteToFile("Simple Service Error on: {0} " + ex.Message + ex.StackTrace);

                //Stop the Windows Service.
                using (System.ServiceProcess.ServiceController serviceController = new System.ServiceProcess.ServiceController("Service"))
                {
                    serviceController.Stop();
                }
            }
        }

        private void SchedularCallback(object e)
        {
            this.WriteToFile("Service Log: {0}");
            this.ScheduleService();
        }

        private void WriteToFile(string text)
        {
            string path = "G:\\TestService\\ServiceLog.txt";
            using (StreamWriter writer = new StreamWriter(path, true))
            {
                writer.WriteLine(string.Format(text, DateTime.Now.ToString("dd/MM/yyyy hh:mm:ss tt")));
                writer.Close();
            }
        }
    }
}

Note: Error: The type or namespace name ConfigurationManager does not exist in the namespace System.Configuration (are you missing an assembly reference?). Add this reference using System.Configuration;

2020-04-17

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