Asp.net MVC Razor view - CS1525: Invalid expression term '.'

asp.net-mvc, c#-6.0, razor, roslyn

Solution

Got it working now after adding the following to the web.config

<system.codedom>
    <compilers>
      <compiler language="c#;cs;csharp" extension=".cs"
        type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.CSharpCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"
        warningLevel="4" compilerOptions="/langversion:6 /nowarn:1659;1699;1701"/>
      <compiler language="vb;vbs;visualbasic;vbscript" extension=".vb"
        type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.VBCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"
        warningLevel="4" compilerOptions="/langversion:14 /nowarn:41008 /define:_MYTYPE=\&quot;Web\&quot; /optionInfer+"/>
    </compilers>
  </system.codedom>

Problem

I have two identical ASP.Net 4.6 MVC project, project 1 is using roslyn complier within the site which is working fine. c:\windows\system32\inetsrv>C:\Websites1\bin\roslyn\csc.exe Microsoft (R) Visual C# Compiler version 1.2.0.60325 With the second project I'm getting the error below, it's using the complier from .Net framework. c:\windows\system32\inetsrv> "C:\Windows\Microsoft.NET\Framework64\v4.0.30319\csc.exe" Microsoft (R) Visual C# Compiler version 4.6.1590.0 `Line 6: @if (!Model?.Item?.IsDerived(Templates.PageMetadata.ID) ?? true) Line 7: { Line 8: return; ` `c:\Website2\Views\metadata.cshtml(6,17): error CS1525: Invalid expression term '.' c:\Website2\Views\metadata.cshtml(6,18): error CS1003: Syntax error, ':' expected c:\Website2\Views\metadata.cshtml(6,23): error CS1525: Invalid expression term '.' c:\Website2\Views\metadata.cshtml(6,24): error CS1003: Syntax error, ':' expected c:\Website2\Views\metadata.cshtml(6,68): error CS1002: ; expected c:\Website2\Views\metadata.cshtml(6,68): error CS1525: Invalid expression term ')' c:\Website2\Views\metadata.cshtml(6,69): error CS1002: ; expected ` I've used Install-Package Microsoft.CodeDom.Providers.DotNetCompilerPlatform on both project. My question is why is the second project not using roslyn complier and is there a way to force it to use the roslyn complier within the site? I've also tried Microsoft.Net.Compilers nuget package.

Original source