在ASP.NET网站安排的作业，而无需购买专用服务器 [英] Scheduled jobs in ASP.NET website without buying dedicated servers

问题描述

我怎么能执行各种任务（如电子邮件警报/发送快讯）一个共享的主机服务器上配置的计划时间？

How can I perform various task (such as email alert/sending news letter) on a configured schedule time on a shared hosting server?

推荐答案

下面是我用来做这种过去的事情，使用高速缓存到期触发计划任务的Global.ascx.cs文件：

Here's a Global.ascx.cs file I've used to do this sort of thing in the past, using cache expiry to trigger the scheduled task:

public class Global : HttpApplication
{
    private const string CACHE_ENTRY_KEY = "ServiceMimicCacheEntry";
    private const string CACHE_KEY = "ServiceMimicCache";

    private void Application_Start(object sender, EventArgs e)
    {
        Application[CACHE_KEY] = HttpContext.Current.Cache;
        RegisterCacheEntry();
    }

    private void RegisterCacheEntry()
    {
        Cache cache = (Cache)Application[CACHE_KEY];
        if (cache[CACHE_ENTRY_KEY] != null) return;
        cache.Add(CACHE_ENTRY_KEY, CACHE_ENTRY_KEY, null,
                  DateTime.MaxValue, TimeSpan.FromSeconds(120), CacheItemPriority.Normal,
                  new CacheItemRemovedCallback(CacheItemRemoved));
    }

    private void SpawnServiceActions()
    {
        ThreadStart threadStart = new ThreadStart(DoServiceActions);
        Thread thread = new Thread(threadStart);
        thread.Start();
    }

    private void DoServiceActions()
    {
        // do your scheduled stuff
    }

    private void CacheItemRemoved(string key, object value, CacheItemRemovedReason reason)
    {
        SpawnServiceActions();
        RegisterCacheEntry();
    }
}

目前，这激发了每2分钟你的行为，但是这是在code配置。

At the moment, this fires off your actions every 2 minutes, but this is configurable in the code.

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