asp.net - 将 MVC-3 升级到 MVC-4

Question

在发布之前，我确实阅读了 here和 SO question -

我采用了一些不同的方法，这似乎更容易。

由于 MVC-3 应用程序包含非常少的 Controller 和 View 。我创建了一个新的 MVC-4 - Basic application 并复制了以下文件 -

1. 控制者
2. 浏览量
3. 布局文件
4. 从旧的 Global.asax.cs 到 App_Start/Route.Config 的路由信息​​

我看到这种方法的优势是

1. 无需手动引用新的 Dll。
2. 无需更新 Web.config 引用。

构建正常，但是在运行应用程序时出现以下错误。

[A]System.Web.WebPages.Razor.Configuration.HostSection cannot be castto [B]System.Web.WebPages.Razor.Configuration.HostSection.

Type Aoriginates from 'System.Web.WebPages.Razor, Version=1.0.0.0,Culture=neutral, PublicKeyToken=31bf3856ad364e35' in the context'Default' at location'C:\WINDOWS\Microsoft.Net\assembly\GAC_MSIL\System.Web.WebPages.Razor\v4.0_1.0.0.0__31bf3856ad364e35\System.Web.WebPages.Razor.dll'.

Type B originates from 'System.Web.WebPages.Razor, Version=2.0.0.0,Culture=neutral, PublicKeyToken=31bf3856ad364e35' in the context'Default' at location'C:\WINDOWS\Microsoft.Net\assembly\GAC_MSIL\System.Web.WebPages.Razor\v4.0_2.0.0.0__31bf3856ad364e35\System.Web.WebPages.Razor.dll'.

显然在某处引用了 MVC3 dll。但不确定在哪里？对此的任何建议都会有所帮助。谢谢!

Answer 1

如果非要我猜的话，我会说你的 ~/Views/web.config 被覆盖并且仍然指向旧的 razor 解析器(以及随后的旧配置部分)。尝试用以下内容替换该文件:

<?xml version="1.0"?>

<configuration>
    <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" />
        <pages pageBaseType="System.Web.Mvc.WebViewPage">
            <namespaces>
                <add namespace="System.Web.Mvc" />
                <add namespace="System.Web.Mvc.Ajax" />
                <add namespace="System.Web.Mvc.Html" />
                <add namespace="System.Web.Optimization" />
                <add namespace="System.Web.Routing" />
            </namespaces>
        </pages>
    </system.web.webPages.razor>

    <appSettings>
        <add key="webpages:Enabled" value="false" />
    </appSettings>

    <system.web>
        <httpHandlers>
            <add path="*" verb="*" type="System.Web.HttpNotFoundHandler"/>
        </httpHandlers>

        <!--
        Enabling request validation in view pages would cause validation to occur
        after the input has already been processed by the controller. By default
        MVC performs request validation before a controller processes the input.
        To change this behavior apply the ValidateInputAttribute to a
        controller or action.
    -->
        <pages
            validateRequest="false"
            pageParserFilterType="System.Web.Mvc.ViewTypeParserFilter, System.Web.Mvc, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"
            pageBaseType="System.Web.Mvc.ViewPage, System.Web.Mvc, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"
            userControlBaseType="System.Web.Mvc.ViewUserControl, System.Web.Mvc, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35">
            <controls>
                <add assembly="System.Web.Mvc, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" namespace="System.Web.Mvc" tagPrefix="mvc" />
            </controls>
        </pages>
    </system.web>

    <system.webServer>
        <validation validateIntegratedModeConfiguration="false" />

        <handlers>
            <remove name="BlockViewHandler"/>
            <add name="BlockViewHandler" path="*" verb="*" preCondition="integratedMode" type="System.Web.HttpNotFoundHandler" />
        </handlers>
    </system.webServer>
</configuration>