Session对象是ASP.NET MVC 4 web应用一旦部署到IIS 7（W 2008 R2）空 [英] The Session object is null in ASP.NET MVC 4 webapplication once deployed to IIS 7 (W 2008 R2)

问题描述

我开发了运行在Visual Studio 2012精部署IIS 7的Windows Server 2008 R2上后的ASP.NET MVC 4 Web应用程序（.NET 4.5），它似乎像HttpContext.Session对象内我的控制器为null 。我创建了一个简单的测试ASP.NET MVC 4应用程序来演示这个问题。

I developed an ASP.NET MVC 4 web application (.net 4.5) which runs fine in Visual Studio 2012. After deployment to IIS 7 on Windows Server 2008 R2, it seems like the HttpContext.Session object inside my controller is null. I created a simple test ASP.NET MVC 4 application to demonstrate the issue.

在我的测试程序我有一个简单的家庭控制器

In my test app I have a simple Home Controller

public class HomeController : Controller
{
    public ActionResult Index()
    {
          if ( HttpContext != null && HttpContext.Session != null )
          {
              HttpContext.Session[ "test" ] = "a string in session state";
              ViewBag.Info = HttpContext.Session[ "test" ];
              return View();
          }
          else
          {
              if ( HttpContext == null )
              {
                  ViewBag.Info = "beeeeuuuuu - HttpContext = null!!!";
              }
              else if ( HttpContext.Session == null )
              {
                    ViewBag.Info = "beeeeuuuuu - Session = null!!!";
              }
              return View();
          }

    }
}

我Index.chtml观点lookes是这样的：

My Index.chtml view lookes something like this:

@{
    ViewBag.Title = "Index";
}

<h2>Index</h2>
This is a simple test
<p>@ViewBag.Info</p>

所以，当我运行该应用程序我得到了我所期待的：

So when I run the application I get what I was expecting:

Index
This is a simple test 
a string in session state

但是在我将应用程序部署到Web服务器的网站给我，表明Session对象为null以下页面：

But after I deploy the application to the web server the website gives me the following page indicating that the Session object is null:

Index
This is a simple test 
beeeeuuuuu - Session = null!!!

Web应用程序部署到该ASP.NET v4.0的应用程序池（综合管线）下运行的默认网站。

The web application is deployed to the default website which runs under the ASP.NET v4.0 application pool (integrated pipeline).

我已经重新安装ASP.NET使用-ir aspnet_regiis的服务器上，但是这并没有帮助。会话状态是在ISS服务器启用（在PROC）。我希望有人能帮助我在这里的原因，我想解决这个问题相当长的一段时间。

I already reïnstalled ASP.NET on the server using aspnet_regiis -ir but this didn't help. The Session state is enabled (In Proc) at the ISS server. I hope anyone can help me out here cause I'm trying to solve this for quite some time.

提前和亲切的问候，不胜感谢。

Much thanks in advance and kind regards.

更新：我还与.NET 4.0而不是4.5测试了一个ASP.NET MVC 4构建和有同样的问题。我还部署了一个ASP.NET网页应用程序（.NET 4.0），且正常工作（该HttpContext.Current.Session不在code后面空）。

UPDATE: I also tested an ASP.NET MVC 4 build with .NET 4.0 instead of 4.5 and that has the same problem. I also deployed an ASP.NET Web Pages app (.NET 4.0) and that works fine (The HttpContext.Current.Session is not null in the code behind).

更新二：我也试图存储会话状态的数据库中，它工作得很好我的开发计算机上，但必须在生产服务器上同样的问题（HttpContext.Session仍然返回null）

UPDATE II: I also tried to store the Session State in a database, which worked fine on my development machine but had the same problem on the production server (HttpContext.Session still returns null).

推荐答案

我找到了解决办法。你必须添加和删除SessionStateModule：

I found the solution. You have to add and remove the SessionStateModule:

  <configuration>
  ...
  <system.webServer>
    ...
    <modules>
      <remove name="Session" />
      <add name="Session" type="System.Web.SessionState.SessionStateModule"/>
      ...
    </modules>
  </system.webServer>
</configuration>

我不知道为什么微软不将其添加到项目模板的web.config文件？

I have no idea why Microsoft doesn't add this to the web.config of the project template?

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