.net实现定时任务(Cache+HttpModule)

主要通过IHttpModule的Init事件及缓存的过期回调事件来实现定时执行任务。

 

自定义HttpModule：

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;



namespace TimingTasks.Controllers

{

    public class HttpModule:IHttpModule

    {

        public void Init(HttpApplication context)

        {

            var tasker = new CacheTimingTasker();

            tasker.RegistCacheTimmer();

        }



        public void Dispose()

        {



        }

    }

}

 

CacheTimingTasker:

using System;

using System.Collections.Generic;

using System.IO;

using System.Linq;

using System.Text;

using System.Web;

using System.Web.Caching;

using System.Web.Hosting;



namespace TimingTasks.Controllers

{

    public class CacheTimingTasker

    {

        const string LogPath = "~/log/log.txt";

        const string CacheKeyName = "TimingTasker";//缓存的名字

        const int ExpireTime = 20;//执行周期(秒)

        private static Cache WebCache = HttpRuntime.Cache;



        /// <summary>

        /// 当缓存不存在的时候则注册该缓存

        /// </summary>

        public void RegistCacheTimmer()

        {

            if (WebCache[CacheKeyName] != null) return;

            WebCache.Add(CacheKeyName, '1', null,

                DateTime.Now.AddSeconds(ExpireTime),

                Cache.NoSlidingExpiration,

                CacheItemPriority.High,

                CacheItemOnRemoved);

            WriteCacheLog("缓存时钟注册成功");

        }



        /// <summary>

        /// 缓存过期的回调函数

        /// </summary>

        /// <param name="key">缓存的名字</param>

        /// <param name="value">缓存的值</param>

        /// <param name="reason">缓存原因</param>

        protected void CacheItemOnRemoved(string key, object value, CacheItemRemovedReason reason)

        {

            if (key == CacheKeyName)

            {

                ExecJob();

                RegistCacheTimmer();

            }

        }



        protected void ExecJob()

        {

            //do sth in plan

            WriteCacheLog("调用计划任务");

        }



        public static void WriteCacheLog(string logInfo)

        {

            using (var sw = new StreamWriter(HostingEnvironment.MapPath(LogPath), true, Encoding.UTF8))

            {

                sw.WriteLine(String.Format("{0} {1}",DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss"),logInfo));

            }

        }

    }

}

 

web.config相关设置：

      </namespaces>

    </pages>

    <httpModules>

      <add type="TimingTasks.Controllers.HttpModule" name="HttpModule" />

    </httpModules>

    <globalization requestEncoding="utf-8" responseEncoding="utf-8" />

  </system.web>

 

 

测试记录：

 

参考资料：http://www.goberl.com/archive/item60.aspx

 

 

FIN。