为什么此代码显示错误？

问题描述：

// Namespace Declaration
using System;

// Program start class
class NamedWelcome
{
    // Main begins program execution.
    static void Main(string[] args)
    {
        // Write to console
        Console.WriteLine("Hello, {0}!", args[0]);
        Console.WriteLine("Welcome to the C# Station Tutorial!"); 
    }
}

每次我在visual studio中启动此代码时，都会发出错误！

ConsoleApplication1.exe中发生未处理的System.IndexOutOfRangeException类型异常

附加信息：索引超出了数组的范围。

我无法理解为什么会发生这种情况？

我是一个newbee到c＃所以请帮助!!

Every time i fire up this code in visual studio, it shoots an error!

An unhandled exception of type 'System.IndexOutOfRangeException' occurred in ConsoleApplication1.exe

Additional information: Index was outside the bounds of the array.

I couldnt understand why does this happens?
I am a newbee to c# so please help!!

答

如果你正在执行没有参数的程序，那么 arg [] 将为空，您将获得该异常。

尝试从命令行运行：

If you are executing the program without arguments then arg[] will be empty and you will get that exception.

Try running like this from the command line:

c:\>yourprogram.exe abhinav

或将您的代码更改为：

or change your code to:

if(args.length >0)
        Console.WriteLine("Hello, {0}!", args[0]);
else
        Console.WriteLine("Please supply an argument when executing.");

解决方案1非常好。有关详细信息，请参阅此处：

命令行参数教程 [ ^ ]

Main（）和Command -Line Arguments（C＃编程指南） [ ^ ]

命令行参数（C＃编程指南） [ ^ ]

CP知识库：

C＃中的自动命令行解析 [ ^ ]

C＃/ .NET命令行参数解析器 [ ^ ]

Solution 1 is very good. For further information, see here:
Command Line Parameters Tutorial[^]
Main() and Command-Line Arguments (C# Programming Guide)[^]
Command-Line Arguments (C# Programming Guide)[^]
CP Knowledge Base:
Automatic Command Line Parsing in C#[^]
C#/.NET Command Line Arguments Parser[^]

为什么此代码显示错误？

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