如何异步运行长时间运行的操作并在 ASP.Net Ajax 中向用户显示加载情况并轮询结果？
我的 ASP.NET 应用程序中有一项繁重的操作，需要很长时间才能完成。我不想在一个请求中运行整个操作，这可能会导致超时错误。相反，我想在单独的线程中调用该操作，并每隔 x 秒轮询一次结果。我该怎么做？
如果操作完成，我需要在 ajax 回发中注册一个脚本来隐藏加载面板并显示内容。但是我无法注册新脚本并在 ajax 回发期间调用它。
有什么想法吗？
I've a heavy operation which takes long time to be completed in my asp.net application. I don't want to run the entire operation in one request which may result in a TimeOut error. Instead I want to invoke the operation in a separate thread and poll for the result every x seconds. How can I do this?
If the operation gets completed I need to register a script in the ajax postback to hide the loading panel and show the content. However I'm not able to register new scripts and invoke it during ajax postbacks.
Any ideas?
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在回发时，我将创建一个线程来启动长时间运行的进程并注册客户端启动脚本。客户端脚本将使用 setTimeOut 调用您的预定义 js 函数来启动对池的第一个 Web 服务调用以进行状态更新。如果结果显示它已完成，您可以在 javascript 中更改面板可见性。否则，它将安排在 x 毫秒后通过 setTimeOut 再次调用再次调用您的 js 函数。
On postback I will create a Thread that launch the long running process and also register client startup script. The client script will use setTimeOut that calls your predefine js function to launch the first webservice call to pool for status update. If result shows that it has finished, you can change the panel visibility in the javascript. Otherwise, it will schedule to invoke your js function again after x millisecond through setTimeOut call again.
选项 1
在代码隐藏中，您可以启动一个线程并使用一些类来管理正在运行的线程。然后，您可以在 UpdatePanel 中设置一个控件，每隔几秒轮询一次进度。
选项 2
将“要做的事情”的详细信息存储在数据库中，并让后台服务不断检查要做的工作。它将完成工作并报告进度。您将拥有一个类似于选项 1 的控件，用于检查进度并更新 UI。
Option 1
In your code-behind you can launch a thread and have some class that manages the running threads. Then you can have a control in an UpdatePanel which polls for the progress every few seconds.
Option 2
Store the details of the "thing to do" in the database and have a background service continually check for work to do. It would do the work and report progress. You would have a control like in Option 1 which checks the progress and updates the UI.