blocks|key|282990|text|您已经升级到Razor+3。记住VS+12+(直到更新4)不支持它。从nuget安装Razor+3，或者通过以下步骤将其降级|type|unstyled|depth|inlineStyleRanges|entityRanges|data|282991|geekswithblogs.net/anirugu/archive/2013/11/04/how-to-downgrade-razor-3-and-fix-the-issue-that.aspx|offset|length|282992|entityMap|0|LINK|mutability|MUTABLE|url|http://geekswithblogs.net/anirugu/archive/2013/11/04/how-to-downgrade-razor-3-and-fix-the-issue-that.aspx^0|0|0|2Q|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@$D|P|E|Q|1|R]]|A|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|M]]]]

You have upgraded to Razor 3. Remember that VS 12 (until update 4) doesn't support it. Install The Razor 3 from nuget or downgrade it through these step

<a href="http://geekswithblogs.net/anirugu/archive/2013/11/04/how-to-downgrade-razor-3-and-fix-the-issue-that.aspx">geekswithblogs.net/anirugu/archive/2013/11/04/how-to-downgrade-razor-3-and-fix-the-issue-that.aspx</a>

blocks|key|533619|text|在此之前，我对这一技术建议表示歉意，但另一种选择，在与NuGet斗争了几个小时后，终于对我起了作用，那就是重新创建一个新的空项目，在我的情况下，只需将你的旧的、现在已经崩溃的项目的内脏复制到新的项目中。花了我大概15分钟。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|533620|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|$]]

Apologies in advance for this lo-tech suggestion, but another option, which finally worked for me after battling NuGet for several hours, is to re-create a new empty project, Web API in my case, and just copy the guts of your old, now-broken project into the new one. Took me about 15 minutes.

blocks|key|533650|text|另一个选项是更新Microsoft.AspnNet.Mvc+NuGet包。小心，因为NuGet更新不更新Web.Config。您应该将所有以前的版本号更新为更新的编号。例如，如果您从asp.net+MVC+4.0.0.0更新到5.0.0.0，那么应该在Web.Config中替换它：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|533651|++++<sectionGroup+name="system.web.webPages.razor"+type="System.Web.WebPages.Razor.Configuration.RazorWebSectionGroup,+System.Web.WebPages.Razor,+Version=3.0.0.0,+Culture=neutral,+PublicKeyToken=31BF3856AD364E35">
++++++<section+name="host"+type="System.Web.WebPages.Razor.Configuration.HostSection,+System.Web.WebPages.Razor,+Version=3.0.0.0,+Culture=neutral,+PublicKeyToken=31BF3856AD364E35"+requirePermission="false"+/>
++++++<section+name="pages"+type="System.Web.WebPages.Razor.Configuration.RazorPagesSection,+System.Web.WebPages.Razor,+Version=3.0.0.0,+Culture=neutral,+PublicKeyToken=31BF3856AD364E35"+requirePermission="false"+/>
++++</sectionGroup>
++</configSections>

+<host+factoryType="System.Web.Mvc.MvcWebRazorHostFactory,+System.Web.Mvc,+Version=5.0.0.0,+Culture=neutral,+PublicKeyToken=31BF3856AD364E35"+/>

<pages
++++validateRequest="false"
++++pageParserFilterType="System.Web.Mvc.ViewTypeParserFilter,+System.Web.Mvc,+Version=5.0.0.0,+Culture=neutral,+PublicKeyToken=31BF3856AD364E35"
++++pageBaseType="System.Web.Mvc.ViewPage,+System.Web.Mvc,+Version=5.0.0.0,+Culture=neutral,+PublicKeyToken=31BF3856AD364E35"
++++userControlBaseType="System.Web.Mvc.ViewUserControl,+System.Web.Mvc,+Version=5.0.0.0,+Culture=neutral,+PublicKeyToken=31BF3856AD364E35">
++<controls>
++++<add+assembly="System.Web.Mvc,+Version=5.0.0.0,+Culture=neutral,+PublicKeyToken=31BF3856AD364E35"+namespace="System.Web.Mvc"+tagPrefix="mvc"+/>
++</controls>
</pages>|code-block|syntax|javascript|533652|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|$]]

Another option is to update the Microsoft.AspnNet.Mvc NuGet package. Be careful, because NuGet update does not update the Web.Config. You should update all previous version numbers to updated number. For example if you update from asp.net MVC 4.0.0.0 to 5.0.0.0, then this should be replaced in the Web.Config:

<pre><code> &lt;sectionGroup name="system.web.webPages.razor" type="System.Web.WebPages.Razor.Configuration.RazorWebSectionGroup, System.Web.WebPages.Razor, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"&gt;
 &lt;section name="host" type="System.Web.WebPages.Razor.Configuration.HostSection, System.Web.WebPages.Razor, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" /&gt;
 &lt;section name="pages" type="System.Web.WebPages.Razor.Configuration.RazorPagesSection, System.Web.WebPages.Razor, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" /&gt;
 &lt;/sectionGroup&gt;
 &lt;/configSections&gt;

 &lt;host factoryType="System.Web.Mvc.MvcWebRazorHostFactory, System.Web.Mvc, Version=5.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" /&gt;

&lt;pages
 validateRequest="false"
 pageParserFilterType="System.Web.Mvc.ViewTypeParserFilter, System.Web.Mvc, Version=5.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"
 pageBaseType="System.Web.Mvc.ViewPage, System.Web.Mvc, Version=5.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"
 userControlBaseType="System.Web.Mvc.ViewUserControl, System.Web.Mvc, Version=5.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"&gt;
 &lt;controls&gt;
 &lt;add assembly="System.Web.Mvc, Version=5.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" namespace="System.Web.Mvc" tagPrefix="mvc" /&gt;
 &lt;/controls&gt;
&lt;/pages&gt;
</code></pre>

blocks|key|533695|text|在Visual中使用NuGet+Package+Manager控制台进行更新|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|533696|Update-Package+-reinstall+Microsoft.AspNet.Mvc|code-block|syntax|javascript|533697|entityMap^0|A|L|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

Update using <code>NuGet Package Manager</code> Console in your Visual Studio
<pre><code>Update-Package -reinstall Microsoft.AspNet.Mvc
</code></pre>

blocks|key|283728|text|对我起作用的是:右键单击项目属性，然后管理Nugget包，然后选择update选项卡，然后选择Microsoft.AspNet.Razor，然后降级到3.0.0版本。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|283729|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|$]]

What worked for me is: right click on project properties then Manage Nugget Packages
then chose update tab then chose Microsoft.AspNet.Razor then downgrade to version 3.0.0

blocks|key|566920|text|我走得更远了。我的项目相当大，我拒绝创建一个新的项目，然后将一切从旧的转移到新的。很无聊。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|566921|我的解决方案|offset|length|style|BOLD|566922|我强迫NUGET重新安装所有的东西，在'Import+Project=...'下取下项目文件中的名称，删除'.props'扩展名。在V/Studio工具菜单上打开NUGET控制台：|CODE|566923|在我的项目(部分)上|566924|Update-Package+-reinstall+Microsoft.Net.Compilers.Toolset
Update-Package+-reinstall+Microsoft.Net.Compilers
Update-Package+-reinstall+Microsoft.CodeAnalysis.Analyzers
Update-Package+-reinstall+Microsoft.TypeScript.MSBuild
Update-Package+-reinstall+EntityFramework
Update-Package+-reinstall+Microsoft.TypeScript.Default
Update-Package+-reinstall+Microsoft.CodeDom.Providers.DotNetCompilerPlatform
Update-Package+-reinstall+Microsoft.Common
Update-Package+-reinstall+Microsoft.TypeScript.MSBuild|code-block|syntax|javascript|566925|Finnaly|566926|然后，在同一个项目文件中，我删除了包含<Error+Condition="!Exists('packages....的所有行，以避免编译器丢失包失败。|566927|我的项目和解决方案现在已经启动并运行。|566928|entityMap^0|0|0|6|0|3|5|J|K|1H|8|0|0|9|0|0|0|7|0|J|13|1X|3|0|0^^$0|@$1|2|3|4|5|6|7|Z|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|10|8|@$D|11|E|12|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|13|8|@$D|14|E|15|F|G]|$D|16|E|17|F|J]|$D|18|E|19|F|J]]|9|@]|A|$]]|$1|K|3|L|5|6|7|1A|8|@$D|1B|E|1C|F|G]]|9|@]|A|$]]|$1|M|3|N|5|O|7|1D|8|@]|9|@]|A|$P|Q]]|$1|R|3|S|5|6|7|1E|8|@$D|1F|E|1G|F|G]]|9|@]|A|$]]|$1|T|3|U|5|6|7|1H|8|@$D|1I|E|1J|F|J]|$D|1K|E|1L|F|G]]|9|@]|A|$]]|$1|V|3|W|5|6|7|1M|8|@]|9|@]|A|$]]|$1|X|3|-4|5|6|7|1N|8|@]|9|@]|A|$]]]|Y|$]]

I went a little bit further. My project is pretty big and I refuse to create a new project and then move everything from the old to the new. Boring.
My solution 
I forced NUGET to reinstall everything, I took the names from the project file under <code>'Import Project=...'</code>, removed the <code>'.props'</code> extension. Open the NUGET console on the V/Studio Tool Menu:
On my project (partial)
<pre><code>Update-Package -reinstall Microsoft.Net.Compilers.Toolset
Update-Package -reinstall Microsoft.Net.Compilers
Update-Package -reinstall Microsoft.CodeAnalysis.Analyzers
Update-Package -reinstall Microsoft.TypeScript.MSBuild
Update-Package -reinstall EntityFramework
Update-Package -reinstall Microsoft.TypeScript.Default
Update-Package -reinstall Microsoft.CodeDom.Providers.DotNetCompilerPlatform
Update-Package -reinstall Microsoft.Common
Update-Package -reinstall Microsoft.TypeScript.MSBuild
</code></pre>
Finnaly 
And then, on the same project file, I deleted all the lines containing <code>&lt;Error Condition=&quot;!Exists('packages....</code> to avoid compiler missing package failure .
My project and solutions are now up and running.

I want using external logins so I installed Oauth by package manager:

<pre><code> PM&gt; Install-Package Microsoft.AspNet.WebPages.OAuth
</code></pre>

Then I got this error after installed it then I install razor:

<pre><code>PM&gt; Install-Package Microsoft.AspNet.Razor
</code></pre>

But I still have this exception. Further more my application is an asp.net application and not a MVC application. Thanks for help.

<pre><code>[FileNotFoundException: Could not load file or assembly 'System.Web.WebPages.Razor, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file specified.]
 Microsoft.Web.WebPages.OAuth.PreApplicationStartCode.Start() +0
</code></pre>

Could not load file or assembly 'System.Web.WebPages.Razor, Version=3.0.0.0

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

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我希望使用外部登录，所以我通过包管理器安装了Oauth： PM> Install-Package Microsoft.AspNet.WebPages.OAuth然后我安装了这个错误，然后我安装了剃须刀：PM> Install-Package Microsoft.AspNet.Razor但我仍然有这个例外。此外，我的应用...

问无法加载文件或程序集'System.Web.WebPages.Razor，Version=3.0.0.0
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