装入对象到新线程缓存 [英] Load objects into cache from new thread

问题描述

我试图使用 BackgroundWorker的类开始一个新的线程，加载大量的对象到缓存中，当启动该网站。

I'm trying to use the BackgroundWorker class to start a new thread which loads a large number of objects into the cache when the website is started.

我的code到目前为止：

My code so far:

private void PreLoadCachedSearches()
{
    var worker = new BackgroundWorker() { WorkerReportsProgress = false, WorkerSupportsCancellation = true };
    worker.DoWork += new DoWorkEventHandler(DoWork);
    worker.RunWorkerCompleted += new RunWorkerCompletedEventHandler(WorkerCompleted);
    worker.RunWorkerAsync();
}

private static void DoWork(object sender, DoWorkEventArgs e)
{
    // Do the cache loading...
    var x = HttpContext.Current.Cache; // BUT the Cache is now null!!!!
}

private static void WorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
    // Logging?
}

我把code中的Global.asax.cs并调用 preLoadCachedSearches 在的Application_Start 事件：新线程启动，但它失败时，它试图访问通过 HttpContext.Current.Cache 这是空。我假设的HttpContext不存在/不在新的线程，我与BackgroundWorker的开球可用。 我也试着动了code到一个单独的页面，并启动线程手动，而不是通过Application_Start事件 - 同样的问题
如果我把我的缓存加载code在Web应用程序的情况下（即没有线程）它工作得很好。

I put the code in Global.asax.cs and call PreLoadCachedSearches during the Application_Start event: The new thread is started, but it fails whenever it tries to access the cache via HttpContext.Current.Cache which is null. I assume HttpContext doesn't exist/isn't available in the new thread I'm kicking off with the BackgroundWorker. I've also tried moving the code to a separate page and start the thread manually rather than via the Application_Start event - same problem.
If I call my cache-loading code in the context of the web application (i.e. no threading) it works just fine.

• 如何解决此问题？传递一个引用到主线程的缓存或以某种方式访问​​它？

此问题是延续了这一previous问题，在ASP.NET 异步任务。

This question is a continuation of this previous question, Asynchronous task in ASP.NET.

推荐答案

您没有一个HttpContext的，因为线程不参与服务的HTTP请求。​​

You don't have an HttpContext because the thread isn't involved in servicing an Http Request.

尝试 HttpRuntime.Cache

这篇关于装入对象到新线程缓存的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！