C#語法學習異常處理(Exception)

using System;
class Test
{
    static void Main()
    {
        /*
        try
        {
            int n=10;
            int m=0;
            float f=n/m;
        }
        catch(Exception e)
        {
            Console.WriteLine(e.Message);
        }
        finally
        {
            Console.WriteLine("finally");
        }
        Console.WriteLine("finally later");
        //*/
        
        /*
        try
        {
            int n=10;
            int m=0;
            float f=n/m;
        }
        catch(Exception e)
        {
            Console.WriteLine("ERROR");
        }
        finally
        {
            Console.WriteLine("finally");
        }
        Console.WriteLine("finally later");
        //*/
        
        /*
        try
        {
            int n=10;
            int m=0;
            float f=n/m;
        }
        //這里應該把庇配度高的異常放到前面,依次是庇配度越低的
        //自然Exception也就放在最後面.
        catch(DivideByZeroException e)
        {
            Console.WriteLine(e.Message);
        }
        catch(Exception e)
        {
            Console.WriteLine(e.Message);
        }
        finally
        {
            Console.WriteLine("finally");
        }
        Console.WriteLine("finally later");
        //*/        
        
        /*
        try
        {
            int n=10;
            int m=0;
            float f=n/m;
        }
        //此處catch後面沒有跟(Exception e)
        //程序會認為是catch(Exception e)
        catch
        {
            Console.WriteLine("ERROR");
        }
        finally
        {
            Console.WriteLine("finally");
        }
        Console.WriteLine("finally later");
        //*/
        
        /*
        try
        {
            string s = null;
            if(s==null)
            {
                throw new ArgumentNullException();
            }
        }
        catch
        {

            //這里拋出一個異常
            Console.WriteLine("接收到拋出的異常");
        }
        finally
        {
            Console.WriteLine("finally");
        }
        Console.WriteLine("finally later");
        //*/
        
    }
}

/*
 * Created by SharpDevelop.
 * User: Administrator
 * Date: 2008/9/11
 * Time: 下午 04:16
 * 
 */
using System;
using System.IO;
public class Exceptions
{
    public static int Main()
    {
        byte[] myStream=new byte[3];
        StreamWriter sw=new StreamWriter("exceptions.txt");
        try
        {
            for(byte b=0;b<10;b++)
            {
                sw.WriteLine("Byte {0}:{1}",b+1,b);
                myStream[b]=b;
            }

        }
        catch(Exception e)
        {
            Console.WriteLine(e.Message);
        }
        finally
        {
            sw.WriteLine("Close");
            sw.Close();
        }
        return 0;
    }
}

/*
 * Created by SharpDevelop.
 * User: Administrator
 * Date: 2008/9/11
 * Time: 下午 04:29
 * 
 */
using System;
using System.IO;
public class TooManyItemsException:Exception
{
    public TooManyItemsException():base(@"自己設計的異常信息"){}
}
public class ExceptionTester
{
    public static int Main()
    {
        ExceptionTester myExceptionMaker=new ExceptionTester();
        try
        {
            myExceptionMaker.GenerateException(5);
        }
        catch(Exception e)
        {
            Console.WriteLine(e.Message);
        }
        finally
        {
            Console.WriteLine("Finally from Main.");
        }
        return 0;
    }
    void GenerateException(int iterations)
    {
        int mySize=3;
        byte[] myStream=new byte[mySize];
        StreamWriter sw=new StreamWriter("aa.txt");
        try
        {
            if(iterations>myStream.Length)
            {
                throw new TooManyItemsException();
            }
            for(byte b=0;b<iterations;b++)
            {
                sw.WriteLine("Byte {0}:{1}",b+1,b);
                myStream[b]=b;
            }
        }
        finally
        {
            Console.WriteLine("Finally from GenerateException.");
            sw.WriteLine("Close");
            sw.Close();
        }
    }
}