什么是一个字符串之前$是什么意思？ [英] What does $ mean before a string?

问题描述

我要使用逐字字符串，但我误输入的 $ 而不是 @ 。

I was going to use verbatim string but i mistakenly typed $ instead of @.

但编译器并没有给我任何的错误和编译成功。

But the Compiler didn't give me any Error and Compiled successfully.

我想知道它是什么，它​​做什么。我搜索了它，但我无法找到任何东西。

I want to know what it is and what it does. I searched for it but i couldn't find anything.

如何过它不像逐字字符串，因为我不能写：

How ever it is not like verbatim string because i cant write:

string str = $"text\";

有谁知道 $ 字符串站之前在C＃。

string str = $"text";

我在使用Visual Studio 2015年CTP。

I'm using Visual studio 2015 CTP.

推荐答案

$ 短手为的String.Format ，并用于与字符串插值，这是C＃6中的新功能作为你的情况下使用，它什么也不做，就像的String.format（）会做什么都没有。

$ is short-hand for String.Format and is used with string interpolations, which is a new feature of C# 6. As used in your case, it does nothing, just as string.Format() would do nothing.

用于构建参照其他值的字符串时，它涉及到它自己。什么previously不得不被写成：

It is comes into its own when used to build strings with reference to other values. What previously had to be written as:

var anInt = 1;
var aBool = true;
var aString = "3";
var formated = string.Format("{0},{1},{2}", anInt, aBool, aString);

现在变成了：

var anInt = 1;
var aBool = true;
var aString = "3";
var formated = $"{anInt},{aBool},{aString}";

还有一个选择 - 少为人知 - 使用字符串插值形式 $ @ （这两个符号的顺序很重要）。它允许 @的特点字符串与 $混合，以支持字符串插值，而不需要为 \\\\ 整个字符串。因此，下面两行：

There's also an alternative - less well known - form of string interpolation using $@ (the order of the two symbols is important). It allows the features of a @"" string to be mixed with $"" to support string interpolations without the need for \\ throughout your string. So the following two lines:

var someDir = "a";
Console.WriteLine($@"c:\{someDir}\b\c");

将输出：

c:\a\b\c

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