<span style="font-size:18px;">using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Text; 
using System.Threading.Tasks; 
 
namespace Text 
{ 
 class Program 
 { 
  static void Main(string[] args) 
  { 
   int[] nums = { 1, 2, 3, 4, 5, 6, 7, 8, 9 }; 
   try//捕获异常 
   { 
    for (int i = 0; i <= nums.Length; i++)//遍历数组所有元素 
    { 
     Console.Write(nums[i] + " "); 
    } 
   } 
   catch (Exception a)//访问异常对象 
   { 
    Console.Write(a.Message);//输出异常错误 
   } 
    Console.WriteLine(); 
    Console.ReadLine(); 
  } 
 
 } 
}</span> 

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Text; 
using System.Threading.Tasks; 
 
namespace Text 
{ 
 class Program 
 { 
  static void Main(string[] args) 
  { 
   int[] nums = { 4,8,12,0,10 }; 
   try//捕获异常 
   { 
    for (int i = 0; i < nums.Length; i++) 
    { 
     int valude = 0; 
     valude = 240 / nums[i]; 
     Console.WriteLine("240/{0}={1}", nums[i], valude); 
    } 
   } 
   catch (Exception a)//访问异常对象 
   { 
    Console.WriteLine(a.Message);//输出异常错误 
   } 
   finally 
   { 
    Console.WriteLine("有没有异常我都会运行"); 
   } 
    Console.WriteLine(); 
    Console.ReadLine(); 
  } 
 
 } 
} 

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Text; 
using System.Threading.Tasks; 
 
namespace Text 
{ 
 class Program 
 { 
  static void Main(string[] args) 
  { 
   string str = "string"; 
   try 
   { 
    int returnInt; 
    returnInt = Program.ConvertStringToInt(str);//调用转换 
    Console.Write(returnInt); 
   } 
   catch (FormatException a) 
   { 
    Console.WriteLine(a.Message); 
   } 
   Console.ReadLine(); 
  } 
  private static int ConvertStringToInt(string str)//定义转换函数 
  { 
   int intNum = 0; 
   try 
   { 
    intNum = Convert.ToInt32(str); 
    return intNum; 
   } 
   catch 
   { 
    throw new FormatException("转换错误");//引发异常 
   } 
  } 
 
 } 
} 

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Text; 
using System.Threading.Tasks; 
 
namespace Text 
{ 
 class MyException : SystemException { }//声明异常 
 class Program 
 { 
  static void Main(string[] args) 
  { 
   try 
   { 
    Console.WriteLine("引发异常前我是被执行的");//引发异常前的提示 
    throw new MyException(); 
    Console.WriteLine("因为已经引发异常，所以我不能被执行"); 
   } 
   catch (MyException) 
   { 
    Console.WriteLine("引发异常"); 
   }  
   Console.ReadLine(); 
  } 
 
 } 
}