学习软件设计——C#练习（11）

 1、除零异常
DivideByZeroException

using System;
using System.Collections.Generic;

public class MyClass
{
	public static void Main()
	{
		Console.WriteLine("请输被除数:");
		int a=int.Parse(Console.ReadLine());
		Console.WriteLine("请输除数:");
		int b=int.Parse(Console.ReadLine());
		try
		{
				int z = a / b;
		}
		catch (DivideByZeroException e)
		{
			Console.Write("除数不能为0哦，亲" + e.Message);
		}
		finally
		{
				Console.Write("无论是否有异常，finally都会出现！");
		}
		Console.ReadKey();
	}

}

2、数组越界

IndexOutOfRangeException

using System;
namespace ArrayException
{
 class Array
 {
  public void CalculateSum()
  {
   int sum = 0;
   int[] number = new int [5]{1,1,1,1,1};
   
   try
   {
    for (int i=1;i<=5;i++)
    {
     sum = sum + number[i];
    } 
    Console.WriteLine("The sum of the array is : {0} ",sum);
   }

   catch(IndexOutOfRangeException e)
   {
    Console.WriteLine("Index was outside the bounds of the array!");
   }
  }   
 } 
 class test
 {
  public static void Main(string[] args)
  {
   Array obj=new Array();
   obj.CalculateSum();
   Console.ReadLine();
  }
 }
}

3、溢出异常
OverFlowException

using System;

class stack
{
	public static void over1() 
	{
		try 
		{
			throw new StackOverflowException();
		} 
		catch (StackOverflowException e) 
		{
			Console.WriteLine(e.Message);
		}
	}
	
	public static void over2() 
	{
		try 
		{
			over(10);
		} 
		catch (StackOverflowException e) 
		{
			Console.WriteLine(e.Message);
		}
	}
	
	public static int over(int p) 
	{
		return 10 + over(p+10);
	}
	
	public static void Main(string[] args) 
	{
		over1();
		over2();
		//Console.WriteLine("异常的处理");
		Console.ReadKey();
	}
}

4、格式不正确
FormatException

using System;
using System.Collections.Generic;

public class ExceptionTest {

	public static void Main(String[] args) {
		String s = "cat miaomiao";
		try {
			int a=int.Parse(s);
		} catch (FormatException e) {
			Console.WriteLine("无法将该字符串转换为数字！");
			Console.ReadKey();
		}
	}
} 

5、finally练习
6、throw练习

using System;
using System.Collections.Generic;
using System.Text;

public class TEApp
    {
        public static void ThrowException()
        {
            throw new Exception();
        }
        public static void Main()
        {
            try
            {
                ThrowException();
                Console.WriteLine("try");
            }
            catch (Exception e)
            {
                Console.WriteLine("catch");
            }
            finally
            {
                Console.WriteLine("finally");
            }
			Console.ReadLine();
        }
    }

7、自定义异常

using System;

public class EmailException:ApplicationException
{
 public EmailException(string e): base(e){}
}

class Program
{
 static void Main()
 {
  Console.WriteLine("请输入Email地址");
  string email = Console.ReadLine();
  string[]substrings = email.Split('@');
  
  try
  {
   if (substrings.Length != 2)
   {
    throw new EmailException("email地址错误");
   }
   else
   {
    Console.WriteLine("输入正确");
   }
  }
  catch (EmailException ex)
  {
   Console.WriteLine(ex.Message);
  }
  
  Console.ReadLine();
 }
}