blocks|key|2839890|text|也许您必须在Visual+Studio工具的命令提示符中执行以下命令：|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|2839891|aspnet_regiis+-i|code-block|syntax|javascript|2839892|您可以阅读有关ASP.NET+IIS注册工具(Aspnet_regiis.exe)+here的更多信息。|2839893|entityMap|0|LINK|mutability|MUTABLE|url|http://msdn.microsoft.com/en-us/library/k6h9cz8h%2528v=vs.100%2529.aspx^0|6|G|0|0|7|Y|16|4|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|X|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|Y|8|@$9|Z|A|10|B|C]]|D|@$9|11|A|12|1|13]]|E|$]]|$1|M|3|-4|5|6|7|14|8|@]|D|@]|E|$]]]|N|$O|$5|P|Q|R|E|$S|T]]]]

Maybe you have to execute the following in the Visual Studio Tools command prompt:

<pre><code>aspnet_regiis -i
</code></pre>

You can read more about the ASP.NET IIS Registration Tool (Aspnet_regiis.exe) <a href="http://msdn.microsoft.com/en-us/library/k6h9cz8h%28v=vs.100%29.aspx">here</a>.

blocks|key|2839895|text|在Windows8.1上，由于.NET+4.5是内置的，修复方法是从管理命令提示符运行以下命令：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2839896|dism.exe+/Online+/Enable-Feature+/all+/FeatureName:IIS-ASPNET45|code-block|syntax|javascript|2839897|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

On Windows 8.1, since .NET 4.5 is built-in, the fix is to run this from an administrative command-prompt:

<pre><code>dism.exe /Online /Enable-Feature /all /FeatureName:IIS-ASPNET45
</code></pre>

blocks|key|3052921|text|对于Windows8客户端计算机，在“互联网信息服务->万维网服务->应用程序开发功能->Windows4.5”下的“打开/关闭Windows功能”中打开"IIS-ASPNET45“。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3052922|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

For Windows 8 client computers, turn on "IIS-ASPNET45" in "Turn Windows Features On/Off" under "Internet Information Services-> World Wide Web Services -> Application Development Features -> ASP.NET 4.5".

blocks|key|2839899|text|我有完全相同的问题，尽管Windows4.5似乎安装在“打开/关闭ASP.NET功能”下。我尝试了所有的方法，直到我最终从“打开/关闭ASP.NET功能”下完全删除了Windows3.5和4.5，重新启动了我的电脑，并重新安装了它们。这就解决了问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2839900|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

I had the exact same problem, despite ASP.NET 4.5 appearing as installed under "Turn Windows Features On/Off". I tried everything until I finally removed ASP.NET 3.5 and 4.5 completely from under "Turn Windows Features On/Off", rebooted my PC and reinstalled them Again. That solved the problem.

blocks|key|2839902|text|我也有同样的问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2839903|并给出了在Turn+Windows+feature+on+or+off菜单中打开ASP.NET的解决方案。|offset|length|style|CODE|2839904|entityMap^0|0|5|U|0^^$0|@$1|2|3|4|5|6|7|J|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|K|8|@$D|L|E|M|F|G]]|9|@]|A|$]]|$1|H|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|I|$]]

I have the same problem.

And got the solution turning on the ASP Net from <code>Turn Windows feature on or off</code> menu.

blocks|key|205545|text|如果你已经安装了.NET+Framework4.6，你可能会看到由于VS错误而导致的这个错误。此处提供解决方法和解决方案：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|205546|http://blogs.msdn.com/b/webdev/archive/2014/11/11/dialog-box-may-be-displayed-to-users-when-opening-projects-in-microsoft-visual-studio-after-installation-of-microsoft-net-framework-4-6.aspx|offset|length|205547|编辑：|205548|正如一些评论中指出的那样，在升级到Windows+10或Visual+Studio+2015之后，这可能会在幕后发生。|205549|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|5A|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|R|8|@]|9|@$D|S|E|T|1|U]]|A|$]]|$1|F|3|G|5|6|7|V|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|W|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|X|8|@]|9|@]|A|$]]]|K|$L|$5|M|N|O|A|$P|C]]]]

If you've installed .NET framework 4.6, you may see this error due to a VS bug. Workarounds and resolutions here:

<a href="http://blogs.msdn.com/b/webdev/archive/2014/11/11/dialog-box-may-be-displayed-to-users-when-opening-projects-in-microsoft-visual-studio-after-installation-of-microsoft-net-framework-4-6.aspx">http://blogs.msdn.com/b/webdev/archive/2014/11/11/dialog-box-may-be-displayed-to-users-when-opening-projects-in-microsoft-visual-studio-after-installation-of-microsoft-net-framework-4-6.aspx</a>

EDIT:

As noted in some of the comments, this can happen behind the scenes after upgrading to Windows 10 or Visual Studio 2015.

blocks|key|204971|text|我也有同样的问题。经过长时间的搜索，我在IIS管理器中将应用程序池更改为ASP.NET+v4.x。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|204972|entityMap^0|10|C|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|K|8|@]|D|@]|E|$]]]|G|$]]

I had the same problem. After a long search , I change the application pool to <code>ASP.NET v4.x</code> in the IIS manager.

blocks|key|205551|text|我也有同样的问题。我尝试了上面的解决方案，但对我不起作用。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|205552|我安装了visual+studio更新，我的问题就解决了。|205553|从下面的http://blogs.msdn.com/b/webdev/archive/2014/11/11/dialog-box-may-be-displayed-to-users-when-opening-projects-in-microsoft-visual-studio-after-installation-of-microsoft-net-framework-4-6.aspx链接下载visual+studio更新|offset|length|205554|谢谢!|205555|entityMap|0|LINK|mutability|MUTABLE|url|http://blogs.msdn.com/b/webdev/archive/2014/11/11/dialog-box-may-be-displayed-to-users-when-opening-projects-in-microsoft-visual-studio-after-installation-of-microsoft-net-framework-4-6.aspx^0|0|0|4|5A|0|0|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|S|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|T|8|@]|9|@$F|U|G|V|1|W]]|A|$]]|$1|H|3|I|5|6|7|X|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|K|$L|$5|M|N|O|A|$P|Q]]]]

I was also having that problem. I tried the above solutions but didn't work for me.

The i installed the visual studio update and my issue was fixed.

Download the visual studio update from the link below
<a href="http://blogs.msdn.com/b/webdev/archive/2014/11/11/dialog-box-may-be-displayed-to-users-when-opening-projects-in-microsoft-visual-studio-after-installation-of-microsoft-net-framework-4-6.aspx" rel="nofollow">http://blogs.msdn.com/b/webdev/archive/2014/11/11/dialog-box-may-be-displayed-to-users-when-opening-projects-in-microsoft-visual-studio-after-installation-of-microsoft-net-framework-4-6.aspx</a>

Thanks!

blocks|key|202723|text|此链接解释了问题的原因以及问题的快速解决方案，它只是通过更新visual+studio来实现的，它还提供了更新的链接。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|202724|http://blogs.msdn.com/b/webdev/archive/2014/11/11/dialog-box-may-be-displayed-to-users-when-opening-projects-in-microsoft-visual-studio-after-installation-of-microsoft-net-framework-4-6.aspx|offset|length|202725|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|5A|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@$D|O|E|P|1|Q]]|A|$]]|$1|F|3|-4|5|6|7|R|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|C]]]]

this link explains what cause the problem and the quick solve to the problem,
it just by updating visual studio and it provide the link for the update

<a href="http://blogs.msdn.com/b/webdev/archive/2014/11/11/dialog-box-may-be-displayed-to-users-when-opening-projects-in-microsoft-visual-studio-after-installation-of-microsoft-net-framework-4-6.aspx" rel="nofollow">http://blogs.msdn.com/b/webdev/archive/2014/11/11/dialog-box-may-be-displayed-to-users-when-opening-projects-in-microsoft-visual-studio-after-installation-of-microsoft-net-framework-4-6.aspx</a>

blocks|key|204974|text|.net框架覆盖了4.0文件夹，因此运行以下命令：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|204975|将.net框架注册到IIS|204976|Start+->+run->+cmd+->+run+as+administrator键入：|204977|cd+C:\Windows\Microsoft.NET\Framework\v4.0.30319
aspnet_regiis.exe+-i|code-block|syntax|javascript|204978|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|O|8|@]|9|@]|A|$]]|$1|F|3|G|5|H|7|P|8|@]|9|@]|A|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

The .net framework overwrites 4.0 folder so run this command:

Register .net framework to IIS goto 
Start -> run-> cmd -> run as administrator
type:

<pre><code>cd C:\Windows\Microsoft.NET\Framework\v4.0.30319
aspnet_regiis.exe -i
</code></pre>

blocks|key|202730|text|windows+10的出现以下错误：为ASP.NET+4.5配置Web+http://localhost:64886/失败。您必须为ASP.NET+4.5手动配置此站点，以便该站点正常运行。ASP.NET+4.0尚未在Web服务器上注册。您需要为ASP.NET+4.0手动配置网站服务器，才能使网站正常运行。解决方案：https://blogs.msdn.microsoft.com/webdev/2014/11/11/dialog-box-may-be-displayed-to-users-when-opening-projects-in-microsoft-visual-studio-after-installation-of-microsoft-net-framework-4-6/|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|202731|entityMap|0|LINK|mutability|MUTABLE|url|http://localhost:64886/|1|https://blogs.msdn.microsoft.com/webdev/2014/11/11/dialog-box-may-be-displayed-to-users-when-opening-projects-in-microsoft-visual-studio-after-installation-of-microsoft-net-framework-4-6/^0|B|7|10|N|0|4F|57|1|0^^$0|@$1|2|3|4|5|6|7|P|8|@$9|Q|A|R|B|C]]|D|@$9|S|A|T|1|U]|$9|V|A|W|1|X]]|E|$]]|$1|F|3|-4|5|6|7|Y|8|@]|D|@]|E|$]]]|G|$H|$5|I|J|K|E|$L|M]]|N|$5|I|J|K|E|$L|O]]]]

For windows 10 with below error:
Configuring Web <a href="http://localhost:64886/" rel="nofollow">http://localhost:64886/</a> for ASP.NET 4.5 failed. You must manually configure this site for ASP.NET 4.5 in order for the site to run correctly. ASP.NET 4.0 has not been registered on the Web server. You need to manually configure your Web server for ASP.NET 4.0 in order for your site to run correctly.
Solution:
<a href="https://blogs.msdn.microsoft.com/webdev/2014/11/11/dialog-box-may-be-displayed-to-users-when-opening-projects-in-microsoft-visual-studio-after-installation-of-microsoft-net-framework-4-6/" rel="nofollow">https://blogs.msdn.microsoft.com/webdev/2014/11/11/dialog-box-may-be-displayed-to-users-when-opening-projects-in-microsoft-visual-studio-after-installation-of-microsoft-net-framework-4-6/</a>

blocks|key|202733|text|我在使用Visual+Studio+2012时也遇到了同样的问题。打开IIS功能就不能工作了，因为我仍然收到错误。试试method+but+no+lucky.|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|202734|我的解决方案是：|202735|通过键入|202736|并按ENTER键，下载hotfix.|unordered-list-item|202737|At+|202738|命令行Restart+IIS。|202739|202740|202741|entityMap|0|LINK|mutability|MUTABLE|url|https://superuser.com/questions/462078/not-all-features-were-successfully-changed-when-trying-to-add-application-deve|1|https://support.microsoft.com/en-us/kb/3002339|2|https://www.microsoft.com/technet/prodtechnol/WindowsServer2003/Library/IIS/003ed2fe-6339-4919-b577-6aa965994a9b.mspx?mfr=true^0|1N|K|0|0|0|0|B|7|1|0|1|3|B|2|1|0|0^^$0|@$1|2|3|4|5|6|7|12|8|@]|9|@$A|13|B|14|1|15]]|C|$]]|$1|D|3|E|5|6|7|16|8|@]|9|@]|C|$]]|$1|F|3|G|5|6|7|17|8|@]|9|@]|C|$]]|$1|H|3|I|5|J|7|18|8|@]|9|@$A|19|B|1A|1|1B]]|C|$]]|$1|K|3|L|5|J|7|1C|8|@]|9|@]|C|$]]|$1|M|3|N|5|J|7|1D|8|@]|9|@$A|1E|B|1F|1|1G]]|C|$]]|$1|O|3|-4|5|6|7|1H|8|@]|9|@]|C|$]]|$1|P|3|-4|5|6|7|1I|8|@]|9|@]|C|$]]|$1|Q|3|-4|5|6|7|1J|8|@]|9|@]|C|$]]]|R|$S|$5|T|U|V|C|$W|X]]|Y|$5|T|U|V|C|$W|Z]]|10|$5|T|U|V|C|$W|11]]]]

I have the same issue when using Visual Studio 2012. By turn on the IIS feature just not working, because I still received the error. Try the <a href="https://superuser.com/questions/462078/not-all-features-were-successfully-changed-when-trying-to-add-application-deve">method but no lucky.</a> 

My solution is:

<ul>
<li>Download the <a href="https://support.microsoft.com/en-us/kb/3002339" rel="nofollow noreferrer">hotfix.</a></li>
<li>At the command line, <a href="https://www.microsoft.com/technet/prodtechnol/WindowsServer2003/Library/IIS/003ed2fe-6339-4919-b577-6aa965994a9b.mspx?mfr=true" rel="nofollow noreferrer">Restart IIS</a> by 
typing <code>iisreset /noforce YourComputerName</code>, and press ENTER.</li>
</ul>

blocks|key|2839960|text|要启用的某些IIS功能：Reference|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|2839961|DISM+/Online+/FeatureName:IIS-ApplicationDevelopment+
/FeatureName:IIS-ASPNET+/FeatureName:IIS-ASP+
/FeatureName:IIS-NetFxExtensibility+
/FeatureName:IIS-ISAPIExtensions+/FeatureName:IIS-ISAPIFilter|code-block|syntax|javascript|2839962|然后修复ASP.NET的IIS映射，运行Aspnet_regiis.exe实用程序。Reference|2839963|entityMap|0|LINK|mutability|MUTABLE|url|https://blogs.msdn.microsoft.com/habibh/2009/08/14/how-to-install-iis-7-5-on-windows-7-using-the-command-line/|1|https://support.microsoft.com/en-us/kb/306005^0|C|9|0|0|0|16|9|1|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@$A|V|B|W|1|X]]|C|$]]|$1|D|3|E|5|F|7|Y|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|Z|8|@]|9|@$A|10|B|11|1|12]]|C|$]]|$1|K|3|-4|5|6|7|13|8|@]|9|@]|C|$]]]|L|$M|$5|N|O|P|C|$Q|R]]|S|$5|N|O|P|C|$Q|T]]]]

Some IIS features to be enabled: <a href="https://blogs.msdn.microsoft.com/habibh/2009/08/14/how-to-install-iis-7-5-on-windows-7-using-the-command-line/" rel="nofollow">Reference</a> 

<pre><code>DISM /Online /FeatureName:IIS-ApplicationDevelopment 
/FeatureName:IIS-ASPNET /FeatureName:IIS-ASP 
/FeatureName:IIS-NetFxExtensibility 
/FeatureName:IIS-ISAPIExtensions /FeatureName:IIS-ISAPIFilter
</code></pre>

Then fix IIS mappings for ASP.NET, run the Aspnet_regiis.exe utility.
<a href="https://support.microsoft.com/en-us/kb/306005" rel="nofollow">Reference</a>

blocks|key|3053064|text|您需要通过程序和功能添加的内容。查看下面的链接，它解决了我的问题。只要遵循下面的步骤，你就会得到它。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3053065|引用自链接：|3053066|3053067|在程序和功能窗口中，点击左窗格中的“打开或关闭窗口功能”。|blockquote|3053068|3053069|现在在树中向下滚动，并找到：|3053070|互联网信息服务>万维网服务>应用程序开发功能...and然后选中所需的所有相关功能。我选择了.NET+3.5和4.6。|3053071|3053072|http://modelrail.otenko.com/electronics/asp-net-4-5-has-not-been-registered-on-the-web-server|offset|length|3053073|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|0|0|0|0|0|0|0|2L|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Z|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|10|8|@]|9|@]|A|$]]|$1|E|3|F|5|G|7|11|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|12|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|13|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|14|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|15|8|@]|9|@]|A|$]]|$1|N|3|O|5|6|7|16|8|@]|9|@$P|17|Q|18|1|19]]|A|$]]|$1|R|3|-4|5|6|7|1A|8|@]|9|@]|A|$]]]|S|$T|$5|U|V|W|A|$X|O]]]]

Something you need to add via the Programs &amp; Features. Check out the link below that solved my issue. Just follow the steps below and you should get it.

Quoted from the link:

<blockquote>
 Once in the Programs and Features window, hit the "Turn Windows
 Features on or off" in the left pane.
 
 Now scroll down through the tree and find:
 
 Internet Information Services > World Wide Web Services > Application
 Development Features ...and then check all the relevant features you
 require. I chose .NET 3.5 and 4.6.
</blockquote>

<a href="http://modelrail.otenko.com/electronics/asp-net-4-5-has-not-been-registered-on-the-web-server" rel="nofollow">http://modelrail.otenko.com/electronics/asp-net-4-5-has-not-been-registered-on-the-web-server</a>

blocks|key|3053083|text|用VS更新解决了这个问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3053084|点击此链接(https://blogs.msdn.microsoft.com/webdev/2014/11/11/dialog-box-may-be-displayed-to-users-when-opening-projects-in-microsoft-visual-studio-after-installation-of-microsoft-net-framework-4-6/)|offset|length|3053085|解决方案：微软已经为所有受影响的Microsoft+Visual+Studio版本发布了修复程序。|style|BOLD|3053086|Visual+Studio+2013+-|3053087|下载Visual+Studio+2013+Update+4有关Visual+Studio+2013+Update+4的更多信息，请参阅:+Visual+Studio+2013+Update+4+KB文章Visual+Studio+2012|3053088|针对Microsoft+Visual+Studio2012的解决此问题的更新已发布:+KB3002339要直接从Microsoft下载中心安装此更新，请访问Visual+Studio2010+SP1|3053089|已发布解决此问题的Microsoft+Visual+Studio2010+SP1更新程序:+KB3002340此更新程序可从Windows+update直接从Microsoft下载中心安装此更新程序，请单击此处|3053090|entityMap|0|LINK|mutability|MUTABLE|url|https://blogs.msdn.microsoft.com/webdev/2014/11/11/dialog-box-may-be-displayed-to-users-when-opening-projects-in-microsoft-visual-studio-after-installation-of-microsoft-net-framework-4-6/^0|0|6|57|0|0|0|4|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Z|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|10|8|@]|9|@$D|11|E|12|1|13]]|A|$]]|$1|F|3|G|5|6|7|14|8|@$D|15|E|16|H|I]]|9|@]|A|$]]|$1|J|3|K|5|6|7|17|8|@]|9|@]|A|$]]|$1|L|3|M|5|6|7|18|8|@]|9|@]|A|$]]|$1|N|3|O|5|6|7|19|8|@]|9|@]|A|$]]|$1|P|3|Q|5|6|7|1A|8|@]|9|@]|A|$]]|$1|R|3|-4|5|6|7|1B|8|@]|9|@]|A|$]]]|S|$T|$5|U|V|W|A|$X|Y]]]]

Resolved it with VS update.

Follow this link (<a href="https://blogs.msdn.microsoft.com/webdev/2014/11/11/dialog-box-may-be-displayed-to-users-when-opening-projects-in-microsoft-visual-studio-after-installation-of-microsoft-net-framework-4-6/" rel="nofollow">https://blogs.msdn.microsoft.com/webdev/2014/11/11/dialog-box-may-be-displayed-to-users-when-opening-projects-in-microsoft-visual-studio-after-installation-of-microsoft-net-framework-4-6/</a>)

Resolution:
Microsoft has published a fix for all impacted versions of Microsoft Visual Studio.

Visual Studio 2013 –

Download Visual Studio 2013 Update 4
For more information on the Visual Studio 2013 Update 4, please refer to: Visual Studio 2013 Update 4 KB Article
Visual Studio 2012

An update to address this issue for Microsoft Visual Studio 2012 has been published: KB3002339
To install this update directly from the Microsoft Download Center, here
Visual Studio 2010 SP1

An update to address this issue for Microsoft Visual Studio 2010 SP1 has been published: KB3002340
This update is available from Windows Update
To install this update directly from the Microsoft Download Center, here

blocks|key|207091|text|尝试一下进入程序和功能窗口->，点击左侧窗格中的“打开或关闭Windows功能”。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|207092|现在在树中向下滚动，并找到：|207093|互联网信息服务万维网服务应用程序开发功能...and然后检查您所需的所有相关功能。我选择了.NET+3.5和4.6。|207094|如果不工作，那么就让它做它的工作，然后你应该在不知不觉中回到VS中的快乐开发领域。如果不是，那么它实际上可能是Visual+Studio中的一个bug。请为您的VS版本检查以下补丁：VS2010、VS2012或VS2013。这肯定会对你有所帮助。|offset|length|207095|entityMap|0|LINK|mutability|MUTABLE|url|https://support.microsoft.com/en-us/kb/3002340|1|https://support.microsoft.com/en-us/kb/3002339|2|https://support.microsoft.com/en-us/kb/2994375^0|0|0|0|2J|6|0|2Q|6|1|2X|6|2|0^^$0|@$1|2|3|4|5|6|7|V|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|W|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|X|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|Y|8|@]|9|@$H|Z|I|10|1|11]|$H|12|I|13|1|14]|$H|15|I|16|1|17]]|A|$]]|$1|J|3|-4|5|6|7|18|8|@]|9|@]|A|$]]]|K|$L|$5|M|N|O|A|$P|Q]]|R|$5|M|N|O|A|$P|S]]|T|$5|M|N|O|A|$P|U]]]]

Try this Once go to the Programs and Features window->, hit the "Turn Windows Features on or off" in the left pane.

Now scroll down through the tree and find:

Internet Information Services
World Wide Web Services
Application Development Features
...and then check all the relevant features you require. I chose .NET 3.5 and 4.6.

and if does not work then go to Let it do its work and then you should be back to happy-development-land in VS before you know it. If not, then it could actually be a bug in Visual Studio. Please check the following patches for your version of VS: <a href="https://support.microsoft.com/en-us/kb/3002340" rel="nofollow">VS2010</a>, <a href="https://support.microsoft.com/en-us/kb/3002339" rel="nofollow">VS2012</a> or <a href="https://support.microsoft.com/en-us/kb/2994375" rel="nofollow">VS2013</a>.
This will surely help you out.

blocks|key|202750|text|不需要键入c:\|type|unstyled|depth|inlineStyleRanges|entityRanges|data|202751|启动->+run->+cmd+->以管理员身份运行并执行以下命令|202752|202753|.NET框架版本4(32位系统)|202754|%25windir%25\Microsoft.NET\Framework\v4.0.30319\aspnet_regiis.exe+-i|202755|.NET框架版本4(64位系统)|202756|%25windir%25\Microsoft.NET\Framework64\v4.0.30319\aspnet_regiis.exe+-i|202757|也可以使用Visual+Studio+Tools中的命令提示符:+C:\ProgramData\Microsoft\Windows\Start+Menu\Programs\Microsoft+Visual+Studio2012\Visual+Studio+Tools>VS2012+x86本机工具命令提示符|202758|版本可能不同..希望这能有所帮助。|202759|entityMap^0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|U|8|@]|9|@]|A|$]]|$1|E|3|F|5|6|7|V|8|@]|9|@]|A|$]]|$1|G|3|H|5|6|7|W|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|X|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|Y|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|Z|8|@]|9|@]|A|$]]|$1|O|3|P|5|6|7|10|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|11|8|@]|9|@]|A|$]]]|R|$]]

Not required to type c:\

Start -> run-> cmd -> Run as administrator and execute below command

<hr>

.NET Framework version 4 (32-bit systems) 

<h2>%windir%\Microsoft.NET\Framework\v4.0.30319\aspnet_regiis.exe -i</h2>

.NET Framework version 4 (64-bit systems)

<h2>%windir%\Microsoft.NET\Framework64\v4.0.30319\aspnet_regiis.exe -i</h2>

Alternatively use Command Prompt from Visual Studio tools:
C:\ProgramData\Microsoft\Windows\Start Menu\Programs\Microsoft Visual Studio 2012\Visual Studio Tools>VS2012 x86 Native Tools Command Prompt

Version could vary.. Hope this helps.

blocks|key|205604|text|在管理员权限下运行visual+studio并执行以下"commandaspnet_regiis+-i“|type|unstyled|depth|inlineStyleRanges|entityRanges|data|205605|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

run visual studio in admin rights and execute following "commandaspnet_regiis -i"

blocks|key|3053166|text|单击tl;dr；单击OK即可解决此问题，之后一切都会正常工作。|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|3053167|我也收到了这个错误消息。|3053168|3053169|为ASP.NET+4.5配置Web+http://localhost:xxxxx/失败。您必须为ASP.NET+4.5手动配置此站点，以便该站点正常运行。ASP.NET+4.0尚未在Web服务器上注册。您需要为ASP.NET+4.0手动配置网站服务器，才能使网站正常运行。|blockquote|3053170|3053171|3053172|环境:+Windows+10、IIS8、VS+2012+Web。|3053173|在找到这个页面，以及几个看似侵入性的解决方案后，我阅读了https://support.microsoft.com/en-us/help/3002339/unexpected-dialog-box-appears-when-you-open-projects-in-visual-studio上的热修复选项，就像这里建议的那样。|3053174|请避免做任何过激的事情，并注意该页面中标记为“解决办法”的部分，如下所示：|3053175|3053176|解决方法|3053177|3053178|3053179|3053180|若要解决此问题，请在创建新项目或打开现有网站项目或Windows+Azure项目后出现对话框时单击“确定”。完成此操作后，项目将按预期工作。|3053181|换句话说，单击对话框上的OK一次，消息就永远消失了。这个项目将会工作得很好。|3053182|entityMap|0|LINK|mutability|MUTABLE|url|http://localhost:xxxxx/|1|https://support.microsoft.com/en-us/help/3002339/unexpected-dialog-box-appears-when-you-open-projects-in-visual-studio^0|2|T|0|0|0|I|N|0|0|0|0|0|S|3A|1|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|1D|8|@$9|1E|A|1F|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|1G|8|@]|D|@]|E|$]]|$1|H|3|-4|5|6|7|1H|8|@]|D|@]|E|$]]|$1|I|3|J|5|K|7|1I|8|@]|D|@$9|1J|A|1K|1|1L]]|E|$]]|$1|L|3|-4|5|6|7|1M|8|@]|D|@]|E|$]]|$1|M|3|-4|5|6|7|1N|8|@]|D|@]|E|$]]|$1|N|3|O|5|6|7|1O|8|@]|D|@]|E|$]]|$1|P|3|Q|5|6|7|1P|8|@]|D|@$9|1Q|A|1R|1|1S]]|E|$]]|$1|R|3|S|5|6|7|1T|8|@]|D|@]|E|$]]|$1|T|3|-4|5|6|7|1U|8|@]|D|@]|E|$]]|$1|U|3|V|5|K|7|1V|8|@]|D|@]|E|$]]|$1|W|3|-4|5|6|7|1W|8|@]|D|@]|E|$]]|$1|X|3|-4|5|6|7|1X|8|@]|D|@]|E|$]]|$1|Y|3|-4|5|6|7|1Y|8|@]|D|@]|E|$]]|$1|Z|3|10|5|6|7|1Z|8|@]|D|@]|E|$]]|$1|11|3|12|5|6|7|20|8|@]|D|@]|E|$]]|$1|13|3|-4|5|6|7|21|8|@]|D|@]|E|$]]]|14|$15|$5|16|17|18|E|$19|1A]]|1B|$5|16|17|18|E|$19|1C]]]]

tl;dr; Clicking OK is the workaround, everything will work fine after that.

I also received this error message.

<blockquote>
 Configuring Web <a href="http://localhost:xxxxx/" rel="nofollow noreferrer">http://localhost:xxxxx/</a> for ASP.NET 4.5 failed. You must manually configure this site for 
 ASP.NET 4.5 in order for the site to run correctly. ASP.NET 4.0 has not been registered on the Web server. 
 You need to manually configure your Web server for ASP.NET 4.0 in order for your site to run correctly.
</blockquote>

Environment: Windows 10, IIS8, VS 2012 Web.

After finding this page, along with several seemingly invasive solutions, I read through the hotfix option at <a href="https://support.microsoft.com/en-us/help/3002339/unexpected-dialog-box-appears-when-you-open-projects-in-visual-studio" rel="nofollow noreferrer">https://support.microsoft.com/en-us/help/3002339/unexpected-dialog-box-appears-when-you-open-projects-in-visual-studio</a> as suggested here.

Please avoid doing anything too drastic, and note the section of that page marked "Workaround" as shown below:

<blockquote>
 <h2>Workaround</h2>
 
 <hr>
 
 To work around this issue, click OK when the dialog box appears after you either create a new project or open an existing Web Site Project or Windows Azure project. After you do this, the project works as expected.
</blockquote>

In other words, click OK on the dialog box one time, and the message is gone forever. The project will work just fine.

In my Win 7 development machine, and in order to use SQL Express instance instead of the localDB installed by default. I unchecked "Use IIS Express" in my MVC 4 project properties page (Web tab), then I got the following error:

ASP.NET 4.5 has not been registered on the Web server. You need to manually configure your Web server for ASP.NET 4.5 in order for your site to run correctly.

I verified that ASP.NET is activated within the IIS features.

Please what could be done to resolve this?

ASP.NET 4.5 has not been registered on the Web server

Visual Studio

服务器

Windows

在我的win7开发机器上，为了使用SQL Express实例而不是默认安装的localDB。我取消选中MVC 4项目属性页(Web选项卡)中的"Use IIS Express“，然后得到以下错误：尚未在网站服务器上注册ASP.NET 4.5。为了让您的站点正常运行，您需要手动配置ASP.NET 4.5的网络服务器。我验...

问ASP.NET 4.5尚未在网站服务器上注册
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