C#中@字符的用途 [英] purpose of the @ character in C#

问题描述

你好，

我已经使用C#进行了一段时间的实验，但我一直看到@字符，但找不到确切的功能.
我看到它在文件路径中使用了，今天，我在其他地方看到了它，无法确定目的.

有人可以解释@字符的确切含义/目的/用途是什么吗?

我在其中看到过的代码段:

Hello,

I''ve been experimenting with C# for some time now, and I keep seeing the @ character and can not find what it does exactly.
I saw it beeing used in file paths, and today I saw it somewhere else and could not figure the purpose.

Can someone explain what the exact meaning/purpose/use of the @ character is?

Code snippets where I saw it used:

string SoftwareKey = @"SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall";

if (printerName.Equals(@"hp deskjet 930c"))

private string sbfFilePath = Application.StartupPath + @"\lukas.sbf";

推荐答案

在上述所有情况下，@均用于允许转义字符.
如果你写这个

In all above cases @ is used to allow escape character.
If you write this

string SoftwareKey = "SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall";

它将给您语法错误.
因此您可以使用此

It will give you syntax error.
So you can use this

string SoftwareKey = "SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Uninstall";

这是困难的方法，因此

This is difficult way so instead

string SoftwareKey = @"SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall";

现在整体使用@
您可以使用reserverd关键字
1.

Now overall use of @
You can use reserverd keyword
1.

string for;

是不允许的，但在下面允许输入代码

is not allowed but below code is allowed

string @for;

2.如上例所示，允许转义字符.

3.使用多行文字

2.To allow escape character as above example.

3.To use multiline text

Label1.Text="First line \n Second Line ";

对此用途进行了安装

Insted of this use this

Label1.Text= @"First line
                 Second Line ";

因此，这里的@符号取其写法.

So here @ sign take line how it is written.

字符串前的"@"字符会关闭转义字符.没有它，任何跟在"\"字符之后的字符都将被解释为特殊代码:

The ''@'' character before a string turns off character escaping. Without it, any character following a ''\'' character is interpreted as a special code:

\n   Newline
\t   Tab
\\   A single '\' character
\"   A single '"' character

等等.

所以

and so on.

So

string s = "\\\"\\\"";

将为您提供包含以下内容的字符串:

would give you a string containing:

A backslash
A doublequote
A backslash
A doublequote

在其前面加上"@"可将其关闭:

Prefixing it with ''@'' turns that off:

string s = @"\""\";

将为您提供相同的结果，这使得路径，正则表达式等更具可读性:

Will give you the same result, which makes paths, regexes and so forth a lot more readable:

@"D:\Temp\MyFile.txt"

与
相反

"D:\\Temp\\MyFile.text"

如果关闭转义，要输入双引号，请同时输入两个:

If you turn off escaping, to enter a double quote, you enter two of them together:

string s = "hello ""Paul"" - this is a string"

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