c#编程之@的3种作用

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对@ 的作用不是很清晰,学习了一下,站在巨人的肩膀上总结如下:

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");
            }
}

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转载自blog.csdn.net/luckystar_99/article/details/84133105