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发布于 2024-07-16 22:57:21 字数 51 浏览 3 评论 0原文

如何在共享托管服务器上按照配置的计划时间执行各种任务（例如电子邮件警报/发送新闻信件）？

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‘画卷フ 2024-07-23 22:57:21

这是我过去用来执行此类操作的 Global.ascx.cs 文件，使用缓存过期来触发计划任务：

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，该文件每 2 分钟触发一次操作，但这可以在代码。

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();
    }
}

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

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