什么是$ - 运算符应该意味着一个字符串？ [英] What's $-operator supposed to mean for a string?

问题描述

所以，我刚刚说了下面在评论部分。

So, I've just had the following conversation with a user in the comments section.

我：

Year year = new Year{ State = States.Happy };

它们：

Them:

eventStream.ReceiveJoke += joke =>  
    Console.WriteLine($"Pretty nice joke: {joke}, Thanks!!!");

和，书呆子，因为我，我不知道他是什么意思美元符号，但我认为它太尴尬地问他。

And, nerdy as I am, I wonder what he meant by the dollar sign but I think it's too embarrassing to ask him.

推荐答案

这是一个插字符串，在C 6＃出台。

It's an interpolated string literal, introduced in C# 6.

这是大致等同于：

eventStream.ReceiveJoke += joke =>  
    Console.WriteLine(string.Format("Pretty nice joke: {0}, Thanks!!!", joke));

编译器查找括号与 $ ，并适用字符串格式化它。您可以使用（大部分）任意表达式，而不仅仅是变量，如：

The compiler looks for braces within any string literal introduced with $, and applies string formatting to it. You can use (mostly) arbitrary expressions, rather than just variables, e.g.

Console.WriteLine($"{year.State} {2000 + 16}"); // Happy 2016

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