Here is a working example (console application) that deomonstrates what you
want to know...
/* Copyright 2003 O'Reilly - used with permission from source code for
Programming C# 3rd Edition by Jesse Liberty */
namespace Programming_CSharp
{
using System;
public class MyCustomException :
System.ApplicationException
{
public MyCustomException(string message):
base(message)
{
}
}
public class Test
{
public static void Main( )
{
Test t = new Test( );
t.TestFunc( );
}
// try to divide two numbers
// handle possible exceptions
public void TestFunc( )
{
try
{
Console.WriteLine("Open file here");
double a = 0;
double b = 5;
Console.WriteLine ("{0} / {1} = {2}",
a, b, DoDivide(a,b));
Console.WriteLine (
"This line may or may not print");
}
// most derived exception type first
catch (System.DivideByZeroException e)
{
Console.WriteLine(
"\nDivideByZeroException! Msg: {0}",
e.Message);
Console.WriteLine(
"\nHelpLink: {0}\n", e.HelpLink);
}
catch (MyCustomException e)
{
Console.WriteLine(
"\nMyCustomException! Msg: {0}",
e.Message);
Console.WriteLine(
"\nHelpLink: {0}\n", e.HelpLink);
}
catch
{
Console.WriteLine(
"Unknown exception caught");
}
finally
{
Console.WriteLine ("Close file here.");
}
}
// do the division if legal
public double DoDivide(double a, double b)
{
if (b == 0)
{
DivideByZeroException e =
new DivideByZeroException( );
e.HelpLink=
"http://www.libertyassociates.com";
throw e;
}
if (a == 0)
{
MyCustomException e =
new MyCustomException(
"Can't have zero divisor");
e.HelpLink =
"http://www.libertyassociates.com/NoZeroDivisor.htm";
throw e;
}
return a/b;
}
}
}
"p988" <p9**@hotmail.com> wrote in message
news:uc**************@TK2MSFTNGP11.phx.gbl...
Could someone show me how to derive and use custom exception types
separately from:System.Exception, System.Object and
System.ApplicationException in C#?
