C # @ Character usage

1. Use the @ symbol to precede the string to indicate that the escape character is "not" handled.

If we write a path to a file, such as the Text.txt file under the "d:/text file" path, do not add the @ symbol as follows:

string " d://text File//text.txt ";

If you use the @ symbol, it's easier:

string @" d:/text File/text.txt ";

2. Let the string cross the line

Sometimes a string is written in a single line for a long time (such as an SQL statement), not with the @ symbol, one way:

string " SELECT * from HumanResources.Employee as e "    " INNER JOIN Person.Contact as C "    " On E.contactid = C.contactid "    " ORDER by C.lastname ";

With the @ symbol, you can change the line directly:

string @" SELECT * from HumanResources.Employee as e     INNER JOIN Person.Contact as C on     E.contactid = C.contactid     ORDER by C.lastname";

3. Usage in identifiers

C # does not allow keywords to be used as identifiers (class name, variable name, method name, tablespace name, and so on), but it is possible to add @ after it, for example:

namespace@namespace {class@class { Public Static void@static (int@int) {            if(@int >0) {System.Console.WriteLine ("Positive Integer"); }            Else if(@int = =0) {System.Console.WriteLine ("Zero"); }            Else{System.Console.WriteLine ("Negative Integer"); }         }     }}

Transferred from: http://blog.csdn.net/chanyinhelv/article/details/6044310

C # @ Character usage