MVC程序集版本不兼容问题

First Error:检测到 ASP.NET Web Pages 的冲突版本: 指定的版本为“2.0.0.0”，而 bin 中的版本为“1.0.0.0”。要继续操作，请删除应用程序 bin 目录中的文件，或者删除 web.config 中的版本指定。

English version:Conflicting versions of ASP.NET WebPages detected: specified version is"1.0.0.0", 
but the version in bin is"2.0.0.0".Tocontinue, remove files from the application's bin directory 
or remove the version specification in web.config.


解决方案：
1。Open 'Package Manager Console' in Visual Studio
2。uninstall-package microsoft.aspnet.mvc
3。install-package microsoft.aspnet.mvc

second Error:
System.Collections.Generic.Dictionary`2<System.String,BlockParser> System.Web.Razor.Parser.CSharpCodeParser.get_RazorKeywords()”。
这些所有的错误都是因为版本不兼容问题，如果你想在MVC3 的版本下运用 razor 2也是可以的

步骤：
First :you can have a reference of system.web.Helpers  and system.web.webPages in your reference assembly

Second:in your ROOT web.config(the bottom one),do some changes,UPDATE OR ADD

 

<appSettings>
 <add key="webpages:Version" value="2.0.0.0"/> 
<add key="webpages:Enabled" value="true" /> <add key="PreserveLoginUrl" value="true" />

<add assembly="System.Web.WebPages, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" /> 
<add assembly="System.Web.Helpers, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD

<dependentAssembly>
   <assemblyIdentity name="System.Web.WebPages" publicKeyToken="31bf3856ad364e35" /> 
   <bindingRedirect oldVersion="1.0.0.0-2.0.0.0" newVersion="2.0.0.0" />
 </dependentAssembly> 
<dependentAssembly> 
   <assemblyIdentity name="System.Web.Helpers" publicKeyToken="31bf3856ad364e35" />
    <bindingRedirect oldVersion="1.0.0.0-2.0.0.0" newVersion="2.0.0.0" /> 
</dependentAssembly>

Inside Views web.config file, add/update these settings,

 <configSections>
		<sectionGroup name="system.web.webPages.razor" type="System.Web.WebPages.Razor.Configuration.RazorWebSectionGroup, System.Web.WebPages.Razor, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35">
			<section name="host" type="System.Web.WebPages.Razor.Configuration.HostSection, System.Web.WebPages.Razor, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" />
			<section name="pages" type="System.Web.WebPages.Razor.Configuration.RazorPagesSection, System.Web.WebPages.Razor, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" />
		</sectionGroup>
      </configSections>
      <system.web.webPages.razor>
		<host factoryType="System.Web.Mvc.MvcWebRazorHostFactory, System.Web.Mvc, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" />

Now you can easily use Razor V2 features in inside ASP.NET MVC 3 view.

      @{
            int? nullValue = null;
      }

      <a href="~/WebForm1.aspx" class="@nullValue">MyLink</a>

 

Note: Before doing this, make sure you have installed ASP.NET MVC 4. Otherwise the trick will fail.

 

 

I must say the configuration of the Microsoft's platform is a little bit annoying.

 

These are  the problems that bothers me very much ,then I share it with all of you.

 

All the version is availablehere:https://nuget.org/packages/Microsoft.AspNet.Mvc/