C# 将文字“@”与字符串变量一起使用
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Using the literal '@' with a string variable
提问by naspinski
I have a helper class pulling a string from an XML file. That string is a file path (so it has backslashes in it). I need to use that string as it is... How can I use it like I would with the literal command?
我有一个从 XML 文件中提取字符串的助手类。该字符串是一个文件路径（所以它有反斜杠）。我需要按原样使用该字符串...如何像使用文字命令一样使用它？
Instead of this:
取而代之的是：
string filePath = @"C:\somepath\file.txt";
I want to do this:
我想做这个：
string filePath = @helper.getFilePath(); //getFilePath returns a string
This isn't how I am actually using it; it is just to make what I mean a little clearer. Is there some sort of .ToLiteral() or something?
这不是我实际使用它的方式；这只是为了让我的意思更清楚一点。是否有某种 .ToLiteral() 之类的？
采纳答案by brock.holum
I don't think you have to worry about it if you already have the value. The @ operator is for when you're specifying the string (like in your first code snippet).
如果你已经拥有了价值，我认为你不必担心。@ 运算符用于指定字符串时（如在您的第一个代码片段中）。
What are you attempting to do with the path string that isn't working?
您试图对不起作用的路径字符串做什么？
回答by Michael Stum
I'm not sure if I understand. In your example: if helper.getFilePath()returns "c:\somepath\file.txt", there will be no problem, since the @is only needed if you are explicitely specifying a string with "".
我不确定我是否理解。在您的示例中：如果helper.getFilePath()返回"c:\somepath\file.txt"，则没有问题，因为@只有在您明确指定带有“”的字符串时才需要。
When Functions talk to each other, you will always get the literal path. If the XML contains c:\somepath\file.txtand your function returns c:\somepath\file.txt, then string filePath will also contain c:\somepath\file.txtas a valid path.
当函数相互通信时，您将始终获得文字路径。如果 XML containsc:\somepath\file.txt并且您的函数返回c:\somepath\file.txt，则字符串 filePath 也将包含c:\somepath\file.txt为有效路径。
回答by Jim Burger
In C# the @ symbol combined with doubles quotes allows you to write escaped strings. E.g.
在 C# 中，@ 符号结合双引号允许您编写转义字符串。例如
print(@"c:\mydir\dont\have\to\escape\backslashes\etc");
If you dont use it then you need to use the escape character in your strings.
如果您不使用它，那么您需要在字符串中使用转义字符。
http://msdn.microsoft.com/en-us/library/aa691090(VS.71).aspx
http://msdn.microsoft.com/en-us/library/aa691090(VS.71).aspx
You dont need to specify it anywhere else in code. In fact doing so should cause a compiler error.
您不需要在代码中的其他任何地方指定它。事实上，这样做应该会导致编译器错误。
回答by Sander
You've got it backwards. The @-operator is for turning literals into strings, while keeping all funky characters. Your path is already a string - you don't need to do anything at all to it. Just lose the @.
你已经倒退了。@-operator 用于将文字转换为字符串，同时保留所有时髦的字符。你的路径已经是一个字符串——你根本不需要对它做任何事情。只是失去@。
string filePath = helper.getFilePath();
回答by Gary Willoughby
The string returned from your helper class is not a literal string so you don't need to use the '@' character to remove the behaviour of the backslashes.
从您的助手类返回的字符串不是文字字符串，因此您不需要使用“@”字符来删除反斜杠的行为。
回答by crashmstr
The @"" just makes it easier to write string literals.
@"" 只是使编写字符串文字更容易。
Verbatim string literals start with @ and are also enclosed in double quotation marks. For example:
@"good morning" // a string literalThe advantage of verbatim strings is that escape sequences are not processed, which makes it easy to write, for example, a fully qualified file name:
@"c:\Docs\Source\a.txt" // rather than "c:\\Docs\\Source\\a.txt"
逐字字符串文字以@ 开头，也用双引号括起来。例如：
@"good morning" // a string literal逐字字符串的优点是不处理转义序列，这使得编写很容易，例如，完全限定的文件名：
@"c:\Docs\Source\a.txt" // rather than "c:\\Docs\\Source\\a.txt"
One place where I've used it is in a regex pattern:
我使用它的一个地方是正则表达式模式：
string pattern = @"\b[DdFf][0-9]+\b";
If you have a string in a variable, you do not need to make a "literal" out of it, since if it is well formed, it already has the correct contents.
如果变量中有一个字符串，则不需要从中生成“文字”，因为如果它的格式正确，则它已经具有正确的内容。
