ASP.NET:Session.SessionID 在请求之间发生变化

Question

为什么 ASP.NET 页面中 Session 对象的属性 SessionID 在请求之间会发生变化？

我有一个这样的页面:

...
<div>
    SessionID: <%= SessionID %>
</div>
...

每次我按 F5 时，输出都会不断变化，与浏览器无关。

Answer 1

这就是原因

When using cookie-based session state, ASP.NET does not allocate storage for session data until the Session object is used. As a result, a new session ID is generated for each page request until the session object is accessed. If your application requires a static session ID for the entire session, you can either implement the Session_Start method in the application's Global.asax file and store data in the Session object to fix the session ID, or you can use code in another part of your application to explicitly store data in the Session object.

http://msdn.microsoft.com/en-us/library/system.web.sessionstate.httpsessionstate.sessionid.aspx

所以基本上，除非您在后端访问 session 对象，否则每个请求都会生成一个新的 sessionId

编辑

此代码必须添加到文件 Global.asax 中。它向 Session 对象添加一个条目，以便您修复 session 直至其过期。

protected void Session_Start(Object sender, EventArgs e) 
{
    Session["init"] = 0;
}