.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。