请问C＃6.0工作.NET 4.0？ [英] Does C# 6.0 work for .NET 4.0?

问题描述

我创建了一个示例项目，用C＃6.0的好东西 - 空传播和属性初始化作为一个例子，设定的目标版本的.NET 4.0和它的作品...

I created a sample project, with C#6.0 goodies - null propagation and properties initialization as an example, set target version .NET 4.0 and it... works.

public class Cat
{
    public int TailLength { get; set; } = 4;

    public Cat Friend { get; set; }

    public string Mew() { return "Mew!"; }
}

class Program
{
    static void Main(string[] args)
    {
        var cat = new Cat {Friend = new Cat()};
        Console.WriteLine(cat?.Friend.Mew());
        Console.WriteLine(cat?.Friend?.Friend?.Mew() ?? "Null");
        Console.WriteLine(cat?.Friend?.Friend?.TailLength ?? 0);
    }
}

• 维基百科说 .NET框架的C＃6.0 4.6。
• 这个问题（和<一href="http://en.wikipedia.org/wiki/Microsoft_Visual_Studio#Visual_Studio_2015">Visual Studio 2015 CTP测试）说CLR版本是4.0.30319.0。
• 此MSDN页面说，.NET 4，4.5，4.5.2使用CLR 4.没有任何有关.NET 4.6。
• Wikipedia says .NET framework for C# 6.0 is 4.6.
• This question (and Visual Studio 2015 CTP test) says CLR version is 4.0.30319.0.
• This MSDN page says that .NET 4, 4.5, 4.5.2 uses CLR 4. There isn't any information about .NET 4.6.

这是否意味着我可以使用C＃6.0的功能为我的软件，面向.NET 4.0？是否有任何限制或缺点？

Does it mean that I can use C# 6.0 features for my software that targets .NET 4.0? Are there any limitations or drawbacks?

推荐答案

是（主要）。 C＃6.0需要新的罗斯林的编译器，但新的编译器可以针对老年framework版本。这仅限于新的功能，不需要从框架支撑

Yes (mostly). C# 6.0 requires the new Roslyn compiler, but the new compiler can compile targeting older framework versions. That's only limited to new features that don't require support from the framework.

例如，当你可以使用字符串插值功能在C＃6.0与早期版本的.Net的（因为它导致调用的String.Format ）：

For example, while you can use the string interpolation feature in C# 6.0 with earlier versions of .Net (as it results in a call to string.Format):

int i = 3;
string s = $"{i}";

您需要的.Net 4.6使用它的 IFormattable ，因为只有新的框架版本增加了 System.FormattableString ：

You need .Net 4.6 to use it with IFormattable as only the new framework version adds System.FormattableString:

int i = 3;
IFormattable s = $"{i}";

您提到不从架构需要类型的工作情况。所以编译器是完全能够支持这些功能的旧框架版本。

The cases you mentioned don't need types from the framework to work. So the compiler is fully capable of supporting these features for old framework versions.

这篇关于请问C＃6.0工作.NET 4.0？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！