ASP.NET静态变量的生命周期(Lifetime of ASP.NET Static Variable)

 我拿在页面类中定义（未在Global.asax中）静态变量的一些信息。 我只在代码中声明变量，如： 
 
protected static int SomeGlobalUnsecureID;
protected static string SomeGlobalUnsecureString;
 
 并在PageLoad事件中定义变量。 例如，我从数据库中检查ID，如果与SomeGlobalUnsecureID不同，我从其他地方更新SomeGlobalUnsecureID和String，否则保留原样。 这在我的应用程序是完全安全的 逻辑（即这些数据不安全，每个人都可以访问它们，没有问题）; 只有我想要完成的是 
 
 
 
 保持相同的内存量，无论用户连接 
 
 
 更改当且仅当持久性信息与“内存”中的信息不同时（因为实际读取字符串对我而言是耗时的。 
 
 
 现在，由于我在PageLoad中进行检查，所以在重新加载的页面中没有问题。 但是我的页面已经满了WebMethods，有时我看到静态变量被归零。 奇怪的部分是 即使静态变量为零，会话仍然处于活动状态（so-> no server或app。pool restart等） 
 
 这对我来说很奇怪 我假设静态变量将保持其值，直到应用程序（以某种方式）结束。 但即使Session没有到期，静态变量也被清零。 你建议什么 使用应用程序变量更好的选择？ 我在网上阅读的所有文档都提供静态变量而不是应用程序变量，我需要声明它们有什么不同吗？ 

I am holding some information in static variables defined in page class (not in Global.asax). I only declare variable in code like:
 
protected static int SomeGlobalUnsecureID;
protected static string SomeGlobalUnsecureString;
 
and define the variable in PageLoad event. For example, I check ID from the database, if it's different from SomeGlobalUnsecureID, I update SomeGlobalUnsecureID and String from somewhere else, otherwise leave them as is. This is perfectly safe in my app. logic (i.e. those data are not secure, everybody can access them, no problem); only thing I want to accomplish is 
 
 
 
Hold the same amount of memory regardless of users connected
 
 
Change if and only if persistent info is different from the one in 'memory' (because actually reading the string is time consuming for me.
 
 
Now, since I make the check in PageLoad, I have no problems in reloaded pages. However my page is full of WebMethods, and sometimes I see that the static variables are zeroed. And the strange part is; the session is still active even when the static variables are zeroed (so-> no server or app. pool restart etc.)
 
This is really strange for me. I assume that static variable will hold its value until the application (somehow) ends. But even the Session did not expire, the static variable is zeroed. What do you suggest? Is using application variables a better choice? All documents I've read on web suggest static variables instead of application variables, do I need to declare them somehow different?

原文：https://stackoverflow.com/questions/8919095