ValueTuple in ASP.NET Core MVC

Question

It seems like Razor doesn't understand the ValueTuple. In my Razor page:

@{
     var x = (1, "a");
}

The code above gives me:

An error occurred during the compilation of a resource required to process this request. Please review the following specific error details and modify your source code appropriately.

I tried the same code in my controller and it's working, I already added the following in my csproj:

<PackageReference Include="System.ValueTuple" Version="4.3.0" />

UPDATE

I added this but still not working:

<PackageReference Include="Microsoft.Net.Compilers" Version="2.1.0" />

Do other C# 7 features work within Razor? I wonder whether you need to add a package for the C# compiler itself... Try `object o = null; if (o is string x) {}` — Jon Skeet, Apr 25 '17 at 10:34
@JonSkeet No they aren't. I tried `var d = 0xAB_CD_EF;` and the code you gave me. — kazinix, Apr 25 '17 at 10:41
Try to add the [Microsoft.Net.Compilers](https://www.nuget.org/packages/Microsoft.Net.Compilers/) for your project — VMAtm, Apr 25 '17 at 16:41
VMAtm can only be used with Full Framework. Nuget has that pasted at the top of the package description. — mvermef, Apr 26 '17 at 02:47

score 1 · Answer 1 · answered May 28 '17 at 21:57

1

Not only do you need to add a newer Compilers package, you also need to configure Razor options.

See previous answer: Using C# 7 features inside of a View in an ASP.NET MVC Core project

answered May 28 '17 at 21:57

Julien Couvreur

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ValueTuple in ASP.NET Core MVC

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