例如:
string strSQL = "SELECT * FROM HumanResources.Employee AS e"
+ " INNER JOIN Person.Contact AS c"
+ " ON e.ContactID = c.ContactID"
+ " ORDER BY c.LastName";使用@后
string strSQL = @"SELECT * FROM HumanResources.Employee AS e
INNER JOIN Person.Contact AS c
ON e.ContactID = c.ContactID
ORDER BY c.LastName";
3.在标识符中的用法