问题描述
我收到以下错误:
[A]System.Web.WebPages.Razor.Configuration.HostSection 无法转换到 [B]System.Web.WebPages.Razor.Configuration.HostSection.A型源自'System.Web.WebPages.Razor，版本=2.0.0.0，Culture=neutral, PublicKeyToken=31bf3856ad364e35' 在上下文中位置的默认"'C:WINDOWSMicrosoft.NetassemblyGAC_MSILSystem.Web.WebPages.Razorv4.0_2.0.0.0__31bf3856ad364e35System.Web.WebPages.Razor.dll'.B 型源自 'System.Web.WebPages.Razor, Version=3.0.0.0,Culture=neutral, PublicKeyToken=31bf3856ad364e35' 在上下文中'C:UsersMyNameAppDataLocalTempTemporary 位置的默认"ASP.NETFiles oot63e7ff36a1cb775dassemblydl38f568c189b7ddacf_d04dcf01System.Web.WebPages.Razor.dll'.
[A]System.Web.WebPages.Razor.Configuration.HostSection cannot be cast to [B]System.Web.WebPages.Razor.Configuration.HostSection. Type A originates from 'System.Web.WebPages.Razor, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' in the context 'Default' at location 'C:WINDOWSMicrosoft.NetassemblyGAC_MSILSystem.Web.WebPages.Razorv4.0_2.0.0.0__31bf3856ad364e35System.Web.WebPages.Razor.dll'. Type B originates from 'System.Web.WebPages.Razor, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' in the context 'Default' at location 'C:UsersMyNameAppDataLocalTempTemporary ASP.NET Files oot63e7ff36a1cb775dassemblydl38f568c189b7ddacf_d04dcf01System.Web.WebPages.Razor.dll'.
我已经在 stackoverflow 中搜索了类似的问题，并使用了他们的解决方案，但它似乎无法解决我遇到的问题.
I have searched across stackoverflow for similar issues and I used their solutions but it doesn't seem to fix the issue I am experiencing.
突然发生了，我刚按了干净的解决方案，就弹出了这个错误.我还开始在解决方案上使用 nuget package restore.我也更新了我的包(使用更新包)，所以其中一个可能与这个问题有关.
It suddenly occurred, I just pressed clean solution and this error popped up. I also started using nuget package restore on the solution. I updated my packages as well (using Update-package) so one of those might have something to do with this issue.
推荐答案
这个错误的原因是 Views 文件夹中的 web.config 引用了 System.Web.WebPages.Razor，Version=2.0.0.0 而不是 3.0.0.0.
The cause of this error is the web.config in the Views folder referencing System.Web.WebPages.Razor, Version=2.0.0.0 instead of 3.0.0.0.
这通常会在 nuget-package 升级后发生，这不考虑此文件夹.
Typically this can happen after a nuget-package upgrade, which does not account for this folder.
更新 ViewsWeb.config 文件:
<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>
有关升级到 MVC 5 的更多信息 http://www.asp.net/mvc/tutorials/mvc-5/how-to-升级-an-aspnet-mvc-4-and-web-api-project-to-aspnet-mvc-5-and-web-api-2
for more information on upgrading to MVC 5 http://www.asp.net/mvc/tutorials/mvc-5/how-to-upgrade-an-aspnet-mvc-4-and-web-api-project-to-aspnet-mvc-5-and-web-api-2
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