c#中的@至少有以下几种作用
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");
}
}