[C#]通用守護進程服務

摘要

很多情況下，都會使用windows服務做一些任務，但總會有一些異常，導致服務停止。這個時候，開發人員又不能立馬解決問題，所以做一個守護者服務還是很有必要的。當檢測到服務停止了，重啟一下服務，等開發人員到位了，再排查錯誤日志。

代碼

app.config

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <startup>
    <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5" />
  </startup>
  <appSettings>
    <!--要守護的服務的服務名稱-->
    <add key="toWatchServiceName" value=""/>
    <!--守護服務的名稱-->
    <add key="serviceName" value="郵件提醒服務守護服務"/>
    <!--每1分鍾檢查一次 以秒為單位-->
    <add key="timerInterval" value="60"/>
  </appSettings>
</configuration>

服務

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

namespace WindowsService.Watch
{
    partial class ServiceWather : ServiceBase
    {
        private static string currentExePath = string.Empty;
        public ServiceWather()
        {
            InitializeComponent();
            currentExePath = AppDomain.CurrentDomain.BaseDirectory;
        }
        /// <summary>
        /// 檢查間隔
        /// </summary>
        private static readonly int _timerInterval = Convert.ToInt32(ConfigurationManager.AppSettings["timerInterval"]) * 1000;
        /// <summary>
        /// 要守護的服務名
        /// </summary>
        private static readonly string toWatchServiceName = ConfigurationManager.AppSettings["toWatchServiceName"];
        private System.Timers.Timer _timer;
        protected override void OnStart(string[] args)
        {
            //服務啟動時開啟定時器
            _timer = new System.Timers.Timer();
            _timer.Interval = _timerInterval;
            _timer.Enabled = true;
            _timer.AutoReset = true;
            _timer.Elapsed += _timer_Elapsed;
            LogHelper.WriteLog(currentExePath, "守護服務開啟");
        }

        void _timer_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
        {
            //如果服務狀態為停止，則重新啟動服務
            if (!CheckSericeStart(toWatchServiceName))
            {
                StartService(toWatchServiceName);
            }
        }

        protected override void OnStop()
        {
            if (_timer != null)
            {
                _timer.Stop();
                _timer.Dispose();
                LogHelper.WriteLog(currentExePath, "守護服務停止");
            }
        }
        /// <summary>
        /// 啟動服務
        /// </summary>
        /// <param name="serviceName">要啟動的服務名稱</param>
        private void StartService(string serviceName)
        {
            try
            {
                ServiceController[] services = ServiceController.GetServices();
                foreach (ServiceController service in services)
                {
                    if (service.ServiceName.Trim() == serviceName.Trim())
                    {
                        service.Start();
                        //直到服務啟動
                        service.WaitForStatus(ServiceControllerStatus.Running, new TimeSpan(0, 0, 30));
                        LogHelper.WriteLog(currentExePath, string.Format("啟動服務:{0}", serviceName));
                    }
                }
            }
            catch (Exception ex)
            {
                LogHelper.WriteLog(currentExePath, ex);
            }
        }
        private bool CheckSericeStart(string serviceName)
        {
            bool result = true;
            try
            {
                ServiceController[] services = ServiceController.GetServices();
                foreach (ServiceController service in services)
                {
                    if (service.ServiceName.Trim() == serviceName.Trim())
                    {
                        if ((service.Status == ServiceControllerStatus.Stopped)
                            || (service.Status == ServiceControllerStatus.StopPending))
                        {
                            result = false;
                        }
                    }
                }
            }
            catch (Exception ex)
            {
                LogHelper.WriteLog(currentExePath, ex);
            }
            return result;
        }
        /// <summary>
        /// 停止
        /// </summary>
        /// <param name="serviceName"></param>
        private void StopService(string serviceName)
        {
            try
            {
                ServiceController[] services = ServiceController.GetServices();
                foreach (ServiceController service in services)
                {
                    if (service.ServiceName.Trim() == serviceName.Trim())
                    {
                        service.Stop();
                        //直到服務停止
                        service.WaitForStatus(ServiceControllerStatus.Stopped, new TimeSpan(0, 0, 30));
                        LogHelper.WriteLog(currentExePath, string.Format("啟動服務:{0}", serviceName));
                    }
                }
            }
            catch (Exception ex)
            {
                LogHelper.WriteLog(currentExePath, ex);
            }
        }
    }
}