c# 用 throw 來拋出異常

throw 用來拋出異常，可自己編寫代碼，拋出所需要的異常。

代碼如下：

[csharp] view plaincopy
using System;  
using System.Collections.Generic;  
using System.Linq;  
using System.Text;  

namespace CheckedAndUnchecked  
{  
    class Program  
    {  
        static void Main(string[] args)  
        {  
            int month;  
            string b;  

            Console.WriteLine("請輸入月份的值:");  
            b = Console.ReadLine();  
            month = int.Parse(b);  

            switch (month)  
            {  
                case 1:  
                    Console.WriteLine("January");  
                    break;  
                case 2:  
                    Console.WriteLine("Feburary");  
                    break;  
                case 3:  
                    Console.WriteLine("March");  
                    break;  
                case 4:  
                    Console.WriteLine("April");  
                    break;  
                case 5:  
                    Console.WriteLine("May");  
                    break;  
                case 6:  
                    Console.WriteLine("June");  
                    break;  
                case 7:  
                    Console.WriteLine("July");  
                    break;  
                case 8:  
                    Console.WriteLine("August");  
                    break;  
                case 9:  
                    Console.WriteLine("September");  
                    break;  
                case 10:  
                    Console.WriteLine("October");  
                    break;  
                case 11:  
                    Console.WriteLine("Novemer");  
                    break;  
                case 12:  
                    Console.WriteLine("December");  
                    break;  
                default:  
                    throw new ArgumentOutOfRangeException("不存在的月份"); // throw  
            }  
        }  
    }  
}  

輸入 13，則會拋出異常，運行後輸出結果如下所示：