What's the @ in front of a string in C#?


Question

This is a .NET question for C# (or possibly VB.net), but I am trying to figure out what's the difference between the following declarations:

string hello = "hello";

vs.

string hello_alias = @"hello";

Printing out on the console makes no difference, the length properties are the same.

2
553
1/11/2012 11:33:14 AM

Accepted Answer

It marks the string as a verbatim string literal - anything in the string that would normally be interpreted as an escape sequence is ignored.

So "C:\\Users\\Rich" is the same as @"C:\Users\Rich"

There is one exception: an escape sequence is needed for the double quote. To escape a double quote, you need to put two double quotes in a row. For instance, @"""" evaluates to ".

695
5/14/2018 10:29:02 PM

Exper Answer

This is a verbatim string, and changes the escaping rules - the only character that is now escaped is ", escaped to "". This is especially useful for file paths and regex:

var path = @"c:\some\location";
var tsql = @"SELECT *
            FROM FOO
            WHERE Bar = 1";
var escaped = @"a "" b";

etc

9
2/17/2009 11:04:42 AM

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