C#中变量名前的@符号是什么意思？
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What does the @ symbol before a variable name mean in C#?
提问by Greg
Possible Duplicate:
What's the use/meaning of the @ character in variable names in C#?
可能的重复：
C# 中变量名中@ 字符的用途/含义是什么？
I understand that the @ symbol can be used before a string literal to change how the compiler parses the string. But what does it mean when a variable name is prefixed with the @ symbol?
我知道可以在字符串文字之前使用 @ 符号来更改编译器解析字符串的方式。但是当变量名以@ 符号为前缀时，这意味着什么？
采纳答案by Michael Meadows
The @ symbol allows you to use reserved word. For example:
@ 符号允许您使用保留字。例如：
int @class = 15;
The above works, when the below wouldn't:
以上工作，当以下不会：
int class = 15;
回答by Joel Coehoorn
It allows you to use a C# keyword as a variable. For example:
它允许您使用 C# 关键字作为变量。例如：
class MyClass
{
public string name { get; set; }
public string @class { get; set; }
}
回答by Micah
The @ symbol serves 2 purposes in C#:
@ 符号在 C# 中有两个用途：
Firstly, it allows you to use a reserved keyword as a variable like this:
首先，它允许您使用保留关键字作为变量，如下所示：
int @int = 15;
The second option lets you specify a string without having to escape any characters. For instance the '\' character is an escape character so typically you would need to do this:
第二个选项允许您指定一个字符串而不必转义任何字符。例如 '\' 字符是一个转义字符，所以通常你需要这样做：
var myString = "c:\myfolder\myfile.txt"
alternatively you can do this:
或者你可以这样做：
var myString = @"c:\myFolder\myfile.txt"
回答by Rasmus Faber
An important point that the other answers forgot, is that "@keyword" is compiled into "keyword" in the CIL.
其他答案忘记的重要一点是，“@keyword”在 CIL 中被编译为“keyword”。
So if you have a framework that was made in, say, F#, which requires you to define a class with a property named "class", you can actually do it.
因此，如果您有一个框架，例如，F#，它要求您定义一个具有名为“class”的属性的类，那么您实际上可以做到。
It is not thatuseful in practice, but not having it would prevent C# from some forms of language interop.
这并不是说有用的做法，但没有它会阻止C＃从某些形式的语言互操作的。
I usually see it used not for interop, but to avoid the keyword restrictions (usually on local variable names, where this is the onlyeffect) ie.
我通常看到它不是用于互操作，而是为了避免关键字限制（通常在局部变量名称上，这是唯一的效果）即。
private void Foo(){
int @this = 2;
}
but I would strongly discourage that! Just find another name, even if the 'best' name for the variable is one of the reserved names.
但我强烈反对！只需找到另一个名称，即使变量的“最佳”名称是保留名称之一。
