试图重现"必须声明一个身体QUOT;编译器错误 [英] Trying to reproduce "must declare a body" compiler error

问题描述

我试图重现 C＃编译器错误CS0840与该公司在网站上给出确切的代码：

I'm trying to reproduce the C# compiler error CS0840 with the exact code that's given in the website:

class Test36
{
    public int myProp { get; } // CS0840

    // to create a read-only property
    // try the following line instead
    public int myProp2 { get; private set; }

}

public Form1()
{
    InitializeComponent();

    Test36 test = new Test36();
}

我在.NET 4.0使用Visual Studio 2015年社区运行令人惊讶的是我不能复制。编译器不会引发任何错误：

I'm running it on .NET 4.0 using Visual Studio Community 2015. Surprisingly, I cannot reproduce it. Compiler doesn't throw any error:

为什么编译器不引发任何错误？

Why the compiler isn't throwing any error?

推荐答案

您正在使用Visual Studio 2015年，它实现了C＃6.事实上，你的目标.NET 4无关 - 大多数的C＃6语言功能不依赖于框架的所有功能。您正在使用的C＃代码6罐的轻松的未经被编译成任何现代CLR或框架的功能 - 它可以使用.NET 1.0工作过，如果语言设计者决定：）

You're using Visual Studio 2015, which implements C# 6. The fact that you're targeting .NET 4 is irrelevant - most of the C# 6 language features don't depend on framework features at all. The C# 6 code you're using can easily be compiled without reference to any modern CLR or framework features - it could have worked with .NET 1.0 if the language designers had decided to :)

您需要将您的语言级别设置为C＃5在这里看到一个错误。这样做，在项目属性/建设/高级对话框：

You'll need to set you language level to C# 5 to see an error here. Do that in the project properties / Build / Advanced dialog:

的

您会再得到这个错误：

错误CS8026：功能'只读自动实现的属性是不是在C＃5可用。请使用语言版本6或更高

error CS8026: Feature 'readonly automatically implemented properties' is not available in C# 5. Please use language version 6 or greater.

诚然，这不是你真正想看到的错误 - 我想你会需要使用编译器的早期版本，以得到确切的错误。

Admittedly that's not the error you actually wanted to see - I think you'll need to use an earlier version of the compiler to get that exact error.

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