在新的 VS Studio 2017 ASP.NET MVC 5.2.3 项目中使用 C# 7 功能时出现编译错误 [英] Compile errors when using C# 7 features in new VS Studio 2017 ASP.NET MVC 5.2.3 project

问题描述

我通常将 VS 2017 用于控制台应用程序.但是现在我必须创建一个新的 ASP.NET MVC 项目并发现了一些奇怪的东西.

I'm using VS 2017 usually for console applications. But now I have to create a new ASP.NET MVC project and found something curious.

自动生成 getter 和 setter(上下文菜单快速操作和重构 < 封装字段(和使用属性)")引发编译错误.举个简单的例子:

Auto generation of getter and setter (context menu "Quick actions and refactoring < Ecapsulate field (and use property)") raise a compiling error. To give an easy example:

public class Person
{
    private string firstname;

    public string Firstname { get => firstname; set => firstname = value; }
}

错误信息:

1>------ Build started: Project: DummyASPNETMVC, Configuration: Debug Any CPU ------
1>C:devC#DummyASPNETMVCDummyASPNETMVCModelsPerson.cs(12,39,12,41): error CS1043: { or ; expected
1>C:devC#DummyASPNETMVCDummyASPNETMVCModelsPerson.cs(12,39,12,41): error CS1513: } expected
1>C:devC#DummyASPNETMVCDummyASPNETMVCModelsPerson.cs(14,2,14,2): error CS1513: } expected
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

取消注释 getter 和 setter 将使事情再次工作.

Uncomment the getter and setter will make the things working again.

我想知道，因为这在控制台应用程序中运行良好.这里的区别在哪里?

I'm wondering because this works fine within a console application. Where's the difference here?

推荐答案

感谢 Panagiotis 和 哲也.那是c#的版本.

Thanks to Panagiotis and Tetsuya. It was the version of c#.

作为这个问题的参考，你必须做三件事:

As a reference to this question, you have to do three things:

1. 通过 Nuget 包管理器卸载Microsoft.CodeDom.Providers.DotNetCompilerPlatform"并重新安装最新版本(当前为 1.0.4)
2. 在此之后，将 Microsoft.Net.Compilers 更新到最新版本(当前为 2.2.0)
3. 通过项目properties < build < advanced"将 c# 语言更改为版本 7.

完成.

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