c#中@的3种作用[转]

1.忽略转义字符

例如

string fileName = "D:\\文本文件\\text.txt";

使用@后

string fileName = @"D:\文本文件\text.txt";

2.让字符串跨行

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

C#是不允许关键字作为标识符(类名、变量名、方法名、表空间名等)使用的，但如果加上@之后就可以了
例如

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");
}
}

 

引用参考：http://www.2cto.com/kf/201009/74766.html