问题
On my VS.NET 2015 development machine, the Razor views that use the nameof operator work like a charm.
When deploying to a Windows server, it fails to compile the CSHTML Razor views:
The name 'nameof' does not exist in the current context.
In German:
Der Name 'nameof' ist im aktuellen Kontext nicht vorhanden.
I've installed .NET Framework 4.6 ("ASP.NET version: 4.6.81.0") with no success.
Most likely I'm missing something plain simple.
Still, I'm really clueless. Is it a web.config setting? Or something else?
My question:
How to enable C# 6 features (like the nameof operator) in CSHTML Razor views?
回答1:
Make sure in your file "web.config" the node system.codedom exists.
<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=\"Web\" /optionInfer+"/>
</compilers>
</system.codedom>
And you'd reference the package Microsoft.CodeDom.Providers.DotNetCompilerPlatform.
回答2:
According to this site, you need to reference the Roslyn compiler in your Web.config file to get C# 6 features to work in your razor views.
This can be achieved simply by installing the CodeDOM Providers for .NET Compiler NuGet package.
PM> Install-Package Microsoft.CodeDom.Providers.DotNetCompilerPlatform
来源：https://stackoverflow.com/questions/33822854/using-nameof-operator-in-razor-views