试图复制“必须声明身体”编译器错误

问题描述

我要重现

为什么编译器不会抛出任何错误？

解决方案

您正在使用Visual Studio 2015，你的目标.NET 4是不相关的 - 大多数C＃6语言功能不依赖于框架的功能。您所使用的C＃6代码可以轻松地编译而不需要参考任何现代CLR或框架特性 - 如果语言设计人员决定使用.NET 1.0，则可以使用它。）

您需要将语言级别设置为C＃5才能在此处看到错误。在项目属性/构建/高级对话框中执行此操作：

您会收到以下错误：

诚然，这不是你真正想看到的错误 - 我想你需要请使用早期版本的编译器来获取确切的错误。

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();
}

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

Why the compiler isn't throwing any error?

解决方案

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 :)

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:

You'll then get this error:

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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