ViewBag and HtmlHelper errors : “One or more types required to compile a dynamic expression cannot be found. Are you missing an assembly reference?”

问题

ViewBag error: "One or more types required to compile a dynamic expression cannot be found. Are you missing an assembly reference?"

All HTML Helper methods contain the error: "The type argument for method cannot be inferred from usage. Try specifying the type arguments explicitly."

After spending the last two days digging through other posts related to this error, here is what I've tried:

Repairing Visual Studio
Re-installing Visual Studio
Making sure I have Microsoft.CSharp and System.Core referenced
Adding to global.asax: ViewEngines.Engines.Clear(); ViewEngines.Engines.Add(new CustomRazorViewEngine());
Changing the reference value of Microsoft.CSharp Copy Local from false to True
Today I installed update RC 3
Checking the GAC for versions (only contains version 4.0.0.0)
Uninstalling/Re-installing the latest version of the .NET framework

Here is my view Web.Config:

<?xml version="1.0"?>

<configuration>
  <configSections>
    <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>

  <system.web.webPages.razor>
    <host factoryType="System.Web.Mvc.MvcWebRazorHostFactory, System.Web.Mvc, Version=5.2.0.0, 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" />
        <add namespace="WebApplication14" />
      </namespaces>
    </pages>
  </system.web.webPages.razor>

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

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

Web.Config:

<?xml version="1.0"?>
<!--
  For more information on how to configure your ASP.NET application, please visit
  http://go.microsoft.com/fwlink/?LinkId=301880
  -->
<configuration>
  <configSections>
    <!-- For more information on Entity Framework configuration, visit http://go.microsoft.com/fwlink/?LinkID=237468 -->
    <section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false"/>
  </configSections>
  <connectionStrings>
    <add name="DefaultConnection" connectionString="Data Source=(LocalDb)\v11.0;AttachDbFilename=|DataDirectory|\aspnet-WebApplication14-20140703071149.mdf;Initial Catalog=aspnet-WebApplication14-20140703071149;Integrated Security=True" providerName="System.Data.SqlClient"/>
  </connectionStrings>
  <appSettings>
    <add key="webpages:Version" value="3.0.0.0"/>
    <add key="webpages:Enabled" value="false"/>
    <add key="ClientValidationEnabled" value="true"/>
    <add key="UnobtrusiveJavaScriptEnabled" value="true"/>
  </appSettings>
  <system.web>
    <authentication mode="None"/>
    <compilation debug="true" targetFramework="4.0"/>
    <httpRuntime/>
  </system.web>
  <system.webServer>
    <modules>
      <remove name="FormsAuthentication"/>
    </modules>
  </system.webServer>
  <runtime>
    <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
      <dependentAssembly>
        <assemblyIdentity name="Newtonsoft.Json" culture="neutral" publicKeyToken="30ad4fe6b2a6aeed"/>
        <bindingRedirect oldVersion="0.0.0.0-6.0.0.0" newVersion="6.0.0.0"/>
      </dependentAssembly>
      <dependentAssembly>
        <assemblyIdentity name="System.Web.Helpers" publicKeyToken="31bf3856ad364e35"/>
        <bindingRedirect oldVersion="1.0.0.0-3.0.0.0" newVersion="3.0.0.0"/>
      </dependentAssembly>
      <dependentAssembly>
        <assemblyIdentity name="System.Web.Mvc" publicKeyToken="31bf3856ad364e35"/>
        <bindingRedirect oldVersion="1.0.0.0-5.2.0.0" newVersion="5.2.0.0"/>
      </dependentAssembly>
      <dependentAssembly>
        <assemblyIdentity name="System.Web.Optimization" publicKeyToken="31bf3856ad364e35"/>
        <bindingRedirect oldVersion="1.0.0.0-1.1.0.0" newVersion="1.1.0.0"/>
      </dependentAssembly>
      <dependentAssembly>
        <assemblyIdentity name="System.Web.WebPages" publicKeyToken="31bf3856ad364e35"/>
        <bindingRedirect oldVersion="1.0.0.0-3.0.0.0" newVersion="3.0.0.0"/>
      </dependentAssembly>
      <dependentAssembly>
        <assemblyIdentity name="WebGrease" publicKeyToken="31bf3856ad364e35"/>
        <bindingRedirect oldVersion="1.0.0.0-1.5.2.14234" newVersion="1.5.2.14234"/>
      </dependentAssembly>
    </assemblyBinding>
  </runtime>
  <entityFramework>
    <defaultConnectionFactory type="System.Data.Entity.Infrastructure.LocalDbConnectionFactory, EntityFramework">
      <parameters>
        <parameter value="v11.0"/>
      </parameters>
    </defaultConnectionFactory>
    <providers>
      <provider invariantName="System.Data.SqlClient" type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer"/>
    </providers>
  </entityFramework>
</configuration>

And here is my Global.asax:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using System.Web.Optimization;
using System.Web.Routing;

namespace WebApplication14
{
    public class MvcApplication : System.Web.HttpApplication
    {
        protected void Application_Start()
        {
            AreaRegistration.RegisterAllAreas();
            FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
            RouteConfig.RegisterRoutes(RouteTable.Routes);
            BundleConfig.RegisterBundles(BundleTable.Bundles);
        }
    }
}

Really at a loss at this point on what to do. This is happening when opening a brand new MVC project as well as old ones. I figured after the new install and updates the error would go away, but I was wrong. Any help would be greatly appreciated.

Example Code:

   @model WebApplication14.Models.ResetPasswordViewModel
    @{
        ViewBag.Title = "Reset password";
    }

    <h2>@ViewBag.Title.</h2>

    @using (Html.BeginForm("ResetPassword", "Account", FormMethod.Post, new { @class = "form-horizontal", role = "form" }))
    {
        @Html.AntiForgeryToken()
        <h4>Reset your password.</h4>
        <hr />
        @Html.ValidationSummary("", new { @class = "text-danger" })
        @Html.HiddenFor(model => model.Code)
        <div class="form-group">
            @Html.LabelFor(m => m.Email, new { @class = "col-md-2 control-label" })
            <div class="col-md-10">
                @Html.TextBoxFor(m => m.Email, new { @class = "form-control" })
            </div>
        </div>
        <div class="form-group">
            @Html.LabelFor(m => m.Password, new { @class = "col-md-2 control-label" })
            <div class="col-md-10">
                @Html.PasswordFor(m => m.Password, new { @class = "form-control" })
            </div>
        </div>
        <div class="form-group">
            @Html.LabelFor(m => m.ConfirmPassword, new { @class = "col-md-2 control-label" })
            <div class="col-md-10">
                @Html.PasswordFor(m => m.ConfirmPassword, new { @class = "form-control" })
            </div>
        </div>
        <div class="form-group">
            <div class="col-md-offset-2 col-md-10">
                <input type="submit" class="btn btn-default" value="Reset" />
            </div>
        </div>
    }

    @section Scripts {
        @Scripts.Render("~/bundles/jqueryval")
    }

回答1:

I also had this problem. After I had performed the following steps this issue was fixed:

Installed Visual Studio update 3
Delete all temporary files (from \Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files, \Windows\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files, \AppData\Local\Temp\Temporary ASP.NET Files\root)
Delete {ProjectName}.v12.suo from the project folder and csproj.user
Create a new asp.net mvc application and copy the Views web.config into the old application. Here there is the differences between the old one(left) and new one(right): http://screencast.com/t/x4WisCWf

EDIT : Ignore the line 20 from comparation files.

回答2:

I had a similar issue after a VM crash. The key step resolving my issue was the second bullet from Boies Ioan's answer - specifically, the last folder mentioned:

"Delete all temporary files (from \Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files, \Windows\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files, \AppData\Local\Temp\Temporary ASP.NET Files\root)"

回答3:

Try rebuilding your solution (press F6). This fixed it for me.

来源：https://stackoverflow.com/questions/24564870/viewbag-and-htmlhelper-errors-one-or-more-types-required-to-compile-a-dynamic

标签

asp.net-mvc

visual-studio-2013

razorengine