CODEWITHSUNDEEP
c#visual-studiovisual-studio-2013
DooDoo
DooDoo

Reputation: 13437

The name 'nameof' does not exist in the current context

I'm using VS 2013 with .Net Framework 4.6. I want to use new C# 6 features(For example nameof).But I couldn't found it.

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Should I use VS 2015? Or higher .Net Framework?

Upvotes: 38

Views: 51867

Answers (9)

Jeremy Thompson
Jeremy Thompson

Reputation: 65534

If you get this error and are using the latest .Net it could be because you are using the name of something that isn't a .Net Type. Here's an example:

Original with need to replace HardCoded "BaseUrl".

IConfiguration settingsConfig = new ConfigurationBuilder().AddJsonFile("appsettings.json").Build();
Settings = Options.Create(new Settings
{
  BaseUrl = settingsConfig.GetSection("BaseUrl").Value
});

This causes the error and it doesn't work because the BaseUrl doesn't exist in context:

IConfiguration settingsConfig = new ConfigurationBuilder().AddJsonFile("appsettings.json").Build();
Settings = Options.Create(new Settings
{
  BaseUrl = settingsConfig.GetSection(nameof(BaseUrl)).Value
});

You need to fully qualify or specify a .Net Type that exists, eg:

Settings = Options.Create(new Settings
{
  BaseUrl = settingsConfig.GetSection(nameof(Settings.BaseUrl)).Value
});

Upvotes: 0

Jorn.Beyers
Jorn.Beyers

Reputation: 2054

I got this error when using DotNetFiddle, I just switched to .NET Core instead of .NET 4.7.X.

Upvotes: 5

Paulj
Paulj

Reputation: 3194

Installing this nuget package fixed it for my project.

Install-Package Microsoft.CodeDom.Providers.DotNetCompilerPlatform

Upvotes: 6

sree
sree

Reputation: 2367

If you are getting this error in Teamcity, make the following changes to build step to correct it.

  1. Open your MSBuild step in teamcity
  2. Change the MSBuild version to Microsoft Build Tools 2015
  3. Change the MSBuild ToolVersion to 14.0

Upvotes: 2

Daniel PP Cabral
Daniel PP Cabral

Reputation: 1624

  1. In "Package Manager Console" execute "install-package Microsoft.Net.Compilers" with your respective project selected.
  2. Ensure "C# Language Level" is "C# 6.0" in your project settings.

Upvotes: 0

ajeh
ajeh

Reputation: 2784

In pre-VS2015 you can add the following class to your solution and replace all instances of nameof( with NameOf.nameof(() => as suggested in get name of a variable or parameter

using System;
using System.Linq.Expressions;

namespace ICSharpCode.SharpZipLib
{
    public class NameOf
    {
        public static String nameof<T>(Expression<Func<T>> name)
        {
            MemberExpression expressionBody = (MemberExpression)name.Body;
            return expressionBody.Member.Name;
        }
    }
}

Upvotes: 5

user1269016
user1269016

Reputation:

You will not be able to use C#6 in VS2013. The compiler will not understand the new C# 6 syntax you are trying to use. How can I add C# 6.0 to Visual Studio 2013?

Upvotes: 4

amit dayama
amit dayama

Reputation: 3326

yes you need to use Visual Studio 2015. It's not supported in VS 2013. Related link : https://msdn.microsoft.com/en-us/library/dn986596.aspx

Upvotes: 6

user743382
user743382

Reputation:

Yes, to use C# 6 features, you need a C# 6 compiler. Visual Studio 2013 doesn't have a C# 6 compiler. Visual Studio 2015 does.

There have been Roslyn pre-releases for Visual Studio 2013, but they don't implement the final C# 6: they actually don't implement all the features, and what they do implement is different from the final C# 6 behaviour.

Upvotes: 42

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