C#进阶2

好了,I COME BACK,下面的代码显示了我们如何打印多个参数:

000: // CommandLinecmdline1.cs001: using System;002:003: public class CommandLine004: {005:     public static void Main(string[] args)006:     {007:         Console.WriteLine("Number of command line parameters = {0}", args.Length);008:         for(int i = 0; i < args.Length; i++)009:         {010:             Console.WriteLine("Arg[{0}] = [{1}]", i, args[i]);011:         }012:     }013: }

如果你的输入为:

cmdline1 A B C

那么它的输出为:
Number of command line parameters = 3
Arg[0] = [A]
Arg[1] = [B]
Arg[2] = [C]

哈哈,看出了其中的秘密了吧!是的{0}是一个标记,它告诉系统,这里留下了给第0个参数用,在程序中,这第0个参数就是i.因此,打印出来的就是Arg[0],面不是Arg[{0}]了,哈哈!

例二向大家展示了foreach这个语句的用法,其实在ASP中,这个经常用到:

000: // CommandLinecmdline2.cs001: using System;002: 003: public class CommandLine2004: {005:     public static void Main(string[] args)006:     {007:         Console.WriteLine("Number of command line parameters = {0}", args.Length);008:         foreach(string s in args)009:         {010:             Console.WriteLine(s);011:         }012:     }013: }

很显然,args是一个数组,而且是字符型的.foreach的意思就是把其中的所有元素都循环完.运行得出:

>cmdline2 John Paul MaryNumber of command line parameters = 3JohnPaulMary