How to use new c# 8.0 features in Razor views

Question

I've updated my ASP.NET Mvc 5 web application to use the new c# 8.0 features through Visual Studio 2019 and everything works fine until I try to use these new features inside a Razor view.

For example, if I try to use the new switch expression:

@{
    ViewBag.Title = "About";

    var foo = 1;
    var bar = foo switch
    {
        1 => "one",
        2 => "two",
        _ => string.Empty
    };
}
<h2>@ViewBag.Title.</h2>
<h3>@ViewBag.Message</h3>

<p>Use this area to provide additional information.</p>

The compiler won't complain until I try to reach the page, giving me a compilation error.

I suspect that Microsoft.CodeDom.Providers.DotNetCompilerPlatform must be updated but it seems that there is no update available.

Is there any way to use c# 8.0 language features in Razor views?

Answer 1

.net framework supports C# 7.3 that's why you can't make your Razor View work

.net core 3 supports C# 8 and i was able to make your example work with a .net Core 3 MVC app.

You can have a look here: https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/configure-language-version

I hope the above helps :)