我升级从Visual Studio 2010中一个大的网站项目至2012年在我的项目，我有与 RUNAT =表元素服务器属性。许多这些有 THEAD 其中的元素。当我在2012年打开它，并尝试建立，我得到以下错误：
I'm upgrading a big web site project from Visual Studio 2010 to 2012. Throughout my project, I have table elements with the runat="server" attribute. Many of these have thead elements inside of them. When I open it in 2012 and and try to build, I get the following error:
Value of type 'System.Web.UI.HtmlControls.HtmlGenericControl' cannot be converted to 'System.Web.UI.HtmlControls.HtmlTableRow'删除 =服务器属性或注释掉 THEAD 修复它。注释掉只有 TR THEAD 不解决它里面的元素。下面是重现问题一个简单的例子：
Removing the runat="server" attribute or commenting out thead fixes it. Commenting out only the tr element inside of thead does not fix it. Here is a simplified example that reproduces the problem:
<%@ Page Language="VB" AutoEventWireup="false" CodeFile="Test.aspx.vb" Inherits="Test" %> <!DOCTYPE html> <html xmlns="www.w3/1999/xhtml"> <head runat="server"> <title></title> </head> <body> <form id="form1" runat="server"> <div> <table id="Example" runat="server"> <thead> <tr> <th>test</th> </tr> </thead> </table> </div> </form> </body> </html>在表元素打开发生错误。
我怎样才能解决这个问题而不做下列之一？
How can I fix this without doing one of the following?
- 删除 =服务器属性
- 删除 THEAD 元素
- 将其更改为一个 ASP：表元素
- Removing the runat="server" attribute
- Removing the thead element
- Changing it to an asp:table element
奖金高达投票的人谁解释了什么是2012年做的不同，是造成这一点。
Bonus up vote for someone who explains what 2012 is doing differently that is causing this.
更新：
问题不会出现在网页的应用的，仅在一个网站。
The problem does not occur in a web app, only in a web site.
该项目实际上并没有升级，只是我的开发环境。在这两种情况下，我使用的是4.0框架
The project isn't actually be upgraded, just my development environment. In both cases, I'm using the 4.0 framework
我尝试使用4.5框架，但它并没有帮助。
I tried using the 4.5 framework, but it didn't help.
2012年9月10日：我有一个开放的情况下，与微软的支持。他们的开发团队正在调查这件事。
Sept 10th, 2012: I have an open case with Microsoft support. Their dev team is looking into it.
十月24，2012：由于.NET 4.5取代4.0，我不能再编译在VS 2010中也。我遇到的问题是纯粹的.NET - 不Visual Studio的。
Oct. 24, 2012: Since .NET 4.5 replaces 4.0, I can no longer compile in VS 2010 also. The problem I am experiencing is purely .NET - not Visual Studio.
推荐答案修正了现在这个问题是可用的。 support.microsoft/kb/2750149 为Windows 8和的 support.microsoft/kb/2750147 为Windows 7平台。
Fix for this issue is available now. support.microsoft/kb/2750149 for windows 8 and support.microsoft/kb/2750147 for Windows 7 platform.
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怎样包括中用runat = THEAD＆QUOT;服务器＆QUOT;表元素？
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