好吧，我想部署.NETFramework 4 IIS7的网站服务器上。我已经改变了应用程序池的目标框架.NET 4中，但应用程序仍然显示我的错误：

Okay, I am trying to deploy a .Net framework 4 website on IIS7 server. I have already changed the application-pool's target framework to .Net 4, but the app is still showing me the error:

配置节System.Web.Extensions程序无法读取，因为它缺少一个段声明的

我猜测有事情做与.NET4的新功能，可以让我有一个小型的Web配置文件。我认为，由于某种原因，IIS7不开心与此有关。

I am guessing that has something to do with the new feature of .Net4 that lets me have a compact Web config file. I think for some reason IIS7 is not happy with this.

我能做些什么，才能成功部署该应用程序或我必须缩减到V3.5？我相信有一个解决方案在那里。

What can I do to deploy this app successfully or do I have to scale back to v3.5? I am sure there is a solution out there.

你有什么建议吗？

推荐答案

您也可以得到这个同样的错误，如果你创建在IIS 7中一个新的网站（0.5）的应用程序池，它创建新网站仍可能被设置为2.0，并且同样地， System.Web.Extensions程序不处于2.0配置文件有效。

You can also get this very same error if you create a new website in IIS 7(.5) as the application pool it creates for the new site may still be set to 2.0, and as such, system.web.extensions is not valid in a 2.0 configuration file.

只需进入IIS管理器，选择应用程序池，选择适合你的应用程序，右击，高级设置，设置的.NET framework版本为V4。

Simply go into IIS Manager, choose the application pools, select the one for your app, right-click, Advanced Settings and set .NET framework version to v4.