ASP.NET：HttpRuntime.Cache节省WebConfigurationManager得到时刷新 - 这是一个错误？ [英] ASP.NET: HttpRuntime.Cache getting flushed when saving WebConfigurationManager -- Is this a bug?

问题描述

最近，我一直在尝试使用缓存的对象与 HttpRuntime.Cache 我一般是IM pression下，如果我补充说：一些东西到缓存是这样的：

Recently, I've been experimenting with caching objects with HttpRuntime.Cache and I was generally under the impression that if I "added" something to the cache like this:

HttpRuntime.Cache.Insert("Test", "This is a test!", null, 
     Cache.NoAbsoluteExpiration, Cache.NoSlidingExpiration, 
     CacheItemPriority.NotRemovable, new CacheItemRemovedCallback(FileChanged));

这在NotRemovable和NoExpiration标志将保持在存储器中的对象的应用程序的持续时间。但被发现在某些页面请求的最后，HttpRuntime.Cache会完全空的！​​

that the "NotRemovable" and "NoExpiration" flags would keep the object in-memory for the duration of the application. But was finding that at the end of certain page requests, the HttpRuntime.Cache would be completely empty!

跟踪直通和设置我的回调中的断点FileChanged我看得出来，确实让人感到删除我的目标（和高速缓存中所有其他对象），但我想不出为什么。所以最终，我开始禁用，我认为可能会影响这个子系统其他的东西。

Tracing thru and setting a breakpoint inside my Callback "FileChanged" I could see that indeed something was "removing" my object (and every other object in the cache), but I couldn't figure out why. So eventually, I started disabling other things that I thought might affect this subsystem.

最后，我注释掉行：

WebConfigurationManager.OpenWebConfiguration("~").Save;

，我已大多来自于的AppSettings区域的web.config检索数据，但偶尔写回的AppSettings和使用上述命令保存变更。我从阅读的web.config文件的缓存，但救了我变回它知道不应该刷新所有HttpRuntime.Cache的，对吧？

I had been mostly retrieving data from "web.config" in the AppSettings region, but occasionally writing back to AppSettings and saving the changes using the above command. I knew from reading that the "web.config" is cached, but saving my changes back to it shouldn't flush all of HttpRuntime.Cache, right?

这是一个错误吗？或者，这两个缓存不知何故，我应该知道的一种方式联系？

Is this a bug? Or are the two caches somehow linked in a way that I should be made aware of?

编辑：

好吧，我做了，如果有人想试试这个自己的机器上这个超级重复的。 （我运行VS2008 Pro的瓦特/ MVC2针对.NET 3.5）只启动一个新项目MVC2并粘贴在任何已经存在以下到的HomeController ：

Ok, I've made this super reproducible if anyone wants to try this on their own machine. (I'm running VS2008 Pro w/ MVC2 targeting .NET 3.5) Just start up a new MVC2 project and paste the following into the HomeController over whatever is already there:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using System.Web.Configuration;
using System.Configuration;

namespace BackButtonTest.Controllers
{
    [HandleError]
    public class HomeController : Controller
    {
        private string MESSAGE = "Message";
        public ActionResult Index()
        {
            ViewData[MESSAGE] = HttpRuntime.Cache.Get(MESSAGE);
            Configuration Config = WebConfigurationManager.OpenWebConfiguration("~");
            Config.AppSettings.Settings.Add("SomeKey", "SomeValue");
            Config.Save();
            return View();
        }

        public ActionResult About()
        {
            HttpRuntime.Cache[MESSAGE] = "This is pulled from the HttpRuntime.Cache";
            return View();
        }
    }
}

然后按照下列步骤操作：

Then follow these steps:

1. 开机调试模式下的应用程序。


2. 点击关于链接。这将加载一个字符串到缓存中。


3. 单击上的主页链接。字符串是从缓存拉和卡在ViewMessage字典。一些键/值对被写入到web.config文件并保存。从缓存中字符串应该出现在主页上。


4. 再次点击主页链接。字符串的应的从缓存中拉出来，但事实并非如此。


5. 停止程序。注释掉的3条线与配置开始。重新启动程序。


6. 重新尝试步骤1 THRU 4。请注意如何HttpRuntime.Cache尚未清空。

1. Start-up the app in debug mode.
2. Click on the "About" link. This loads a string into the Cache.
3. Click on the "Home" link. String is pulled from the Cache and stuck in ViewMessage dictionary. Some key/value pair is written to web.config and saved. String from cache should appear on the Home page.
4. Click on the "Home" link again. String should be pulled from the cache, but it's not.
5. Stop program. Comment out the 3 lines that start with "Config". Restart the program.
6. Try steps 1 thru 4 again. Notice how the HttpRuntime.Cache has not been emptied.

奇怪的，是吧？

推荐答案

写你的web.config强制应用程序重新启动，而且，最有可能的，事件清空缓存，进程内的sessionState等将熄灭。试着写下一些日志在Global.asax中Application_End（或任何方法的名称是:)）

Writing to your web.config will force the application to restart, and, most likely, events for emptying the cache, in-proc sessionstate etc. will go off. Try and write down some log in global.asax Application_End (or whatever the name of the method is :) )

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