C#编程之C#基础（五）

 1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Text;
 5 using System.Threading.Tasks;
 6 
 7 namespace Abnormal
 8 {
 9     class Program
10     {
11         static void Main(string[] args)
12         {
13             string userInput;
14             while(true)
15             {
16                 try
17                 {
18                     Console.WriteLine("Input a number between 0 and 5.");
19                     userInput = Console.ReadLine();
20                     if(userInput=="")
21                     {
22                         break;
23                     }
24                     int index = Convert.ToInt32(userInput);
25                     if(index<0||index>5)
26                     {
27                         throw new IndexOutOfRangeException("Input="+ userInput);
28                     }
29                     Console.WriteLine("your number is " + index);
30                 }
31                 catch(IndexOutOfRangeException ex)
32                 {
33                     Console.WriteLine("error:" + "please enter number between 0 and 5: " + ex.Message);
34                 }
35                 catch(Exception ex)
36                 {
37                     Console.WriteLine("error unknown throw: " + ex.Message);
38                 }
39                 catch
40                 {
41                     Console.WriteLine("some unkown exception has ocurred.");
42                 }
43                 finally
44                 {
45                     Console.WriteLine("thank you.");
46                 }
47             }
48         }
49     }
50 }