/**////<summary>
/// Exception Sample
///</summary>
namespace ExceptionSample
{
using System;
class EntryPoint
{
static void Main()
{
string userInput;
while (true)
{
try
{
Console.WriteLine("Input a number between 1 and 5 and press enter to exit");
userInput = Console.ReadLine();
userInput = userInput.ToString().Trim();
if (userInput == "")
break; /**////exit while loop
int index = Convert.ToInt32(userInput);//maybe throw FormatException
if (index < 0 || index > 5)
throw new System.IndexOutOfRangeException("you typed in" + userInput);/**////Throw IndexOutOfRangeException to cacth
Console.WriteLine("your number is " + index);
}
catch (System.FormatException e)
{
Console.WriteLine("FormatException:Number should be between 1 and 5" + e.Message);
}
catch (System.IndexOutOfRangeException e)
{
Console.WriteLine("IndexOutOfRangeException:Number should be between 1 and 5" + e.Message);
}
catch (System.Exception e)
{
Console.WriteLine("some other exception occured"+e.Message);
}
finally
{
Console.WriteLine("thank you ");
}
}
}
}
}实例二
/**////<summary>
/// Exception Sample
///</summary>namespace ZYG.CSharp.Exception
{
using System;
using System.IO;
/**////<summary>
/// defined exception class
///</summary>
class LandLineSpyFoundException : System.ApplicationException
{
public LandLineSpyFoundException(string spyName)
: base("LandLine spy found,with name=" + spyName)
{
}
public LandLineSpyFoundException(string spyName, Exception innerException)
: base("LandLine spy found,with name=" + spyName, innerException)
{
}
}
/**//////////////////////////////////////////////////
class ColdCallFileFormatException : System.ApplicationException
{
public ColdCallFileFormatException(string message)
: base(message)
{
}
public ColdCallFileFormatException(string message, Exception innerException)
: base( message,innerException)
{
}
}
/**/////////////////////////////////////
class UnexpectedException : System.ApplicationException
{
public UnexpectedException(string message)
: base(message)
{
}
public UnexpectedException(string message, Exception innerException)
: base(message, innerException)
{
}
}
/**////<summary>
/// file reader class
///</summary>
class ColdCallFileReader : System.IDisposable
{
FileStream fs;
StreamReader sr;
uint nPeopleToRing;
bool isDisposed = false;
bool isOpen = false;
public void Open(string filename)
{
if (isDisposed)
throw new System.ObjectDisposedException("peopleToRing");//-------------------Exception Point
fs = new System.IO.FileStream(filename, FileMode.Open); //FileNotFoundException Point
sr=new System.IO.StreamReader(fs);
try
{
string firstLine = sr.ReadLine(); //人员个数
nPeopleToRing = uint.Parse(firstLine); /**////Exception Point FomatException
isOpen=true;
}
catch( System.FormatException e)
{
throw new ColdCallFileFormatException("firstLine isn\'t an integer", e);
}
finally
{}
}
public void ProcessNextPerson()
{
if (isDisposed)
throw new System.ObjectDisposedException("peopleToRing");//-------------------Exception Point
if (!isOpen)
throw new UnexpectedException("Attempt to access cold call first is not open");
try
{
string name;
name = sr.ReadLine();
if (name == null)
throw new ColdCallFileFormatException("Not enough names");
if (name[0] == 'Z')
throw new LandLineSpyFoundException(name);
Console.WriteLine(name);
}
catch (LandLineSpyFoundException e)
{
Console.WriteLine(e.Message);
}
finally
{ }
}
public uint NPeopleToRing
{
get {
if (isDisposed)
throw new System.ObjectDisposedException("peopleToRing");//-------------------Exception Point
if (!isOpen)
throw new UnexpectedException("Attempt to access cold call first is not open");
return nPeopleToRing;
}
}
public void Dispose()
{
if (isDisposed)
return;
isDisposed = true;
isOpen = false;
if (fs != null)
{
fs.Close();
fs = null;
}
}
}
class EntryPoint
{
static void Main()
{
string filename;
Console.WriteLine("Please type in the name of the file containing the names of the people to be cold-Called");
filename = Console.ReadLine();
ColdCallFileReader peopleToRing = new ColdCallFileReader();
try
{
peopleToRing.Open(filename);
for (int i = 0; i < peopleToRing.NPeopleToRing; i++)
{
peopleToRing.ProcessNextPerson();
}
Console.WriteLine("All callers processed correctly");
}
catch (System.IO.FileNotFoundException e)
{
Console.WriteLine("The file{0} does not exist", filename);
}
catch (ColdCallFileFormatException e)
{
Console.WriteLine("The file {0} appears have been corrupted", filename);
}
catch (System.Exception e)
{
Console.WriteLine("Exception occured :\n"+e.Message);
}
finally
{
peopleToRing.Dispose();
}
Console.ReadLine();
}
}
}
posted @ 2007-04-27 21:06
Robot·H 阅读(74)
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C#2.0