Exception Handling User-Defined Exception Classes

/*
A Programmer's Introduction to C# (Second Edition)
by Eric Gunnerson

Publisher: Apress  L.P.
ISBN: 1-893115-62-3
*/

// 04 - Exception Handling\User-Defined Exception Classes
// copyright 2000 Eric Gunnerson
using System;

public class UserDefinedExceptionClasses
{
    public static void Main()
    {
        Summer summer = new Summer();
        try
        {
            summer.DoAverage();
        }
        catch (CountIsZeroException e)
        {
            Console.WriteLine("CountIsZeroException: {0}", e);
        }
    }
}
public class CountIsZeroException: ApplicationException
{
    public CountIsZeroException()
    {
    }
    public CountIsZeroException(string message)
    : base(message)
    {
    }
    public CountIsZeroException(string message, Exception inner)
    : base(message, inner)
    {
    }
}
public class Summer
{
    int    sum = 0;
    int    count = 0;
    float    average;
    public void DoAverage()
    {
        if (count == 0)
        throw(new CountIsZeroException("Zero count in DoAverage"));
        else
        average = sum / count;
    }
}

1.	Exception handle with your own exception class
2.	illustrates a custom exception
3.	Demonstrates defining and using a custom exception class
4.	illustrates the use of a System.Exception object
5.	Using Exception members
6.	Use the NullReferenceException
7.	Use a custom Exception for RangeArray errors
8.	Derived exceptions must appear before base class exceptions
9.	calls GetBaseException and outputs the error message of the initial exception.
10.	uses some of the properties of the Exception class
11.	Using checked and unchecked
12.	refines the System.Exception base class with name of the type and time of exception to create your own Exception
13.	Using checked and unchecked with statement blocks
14.	Exception Handling: The Exception Hierarchy 1
15.	Exception Handling: The Exception Hierarchy 2
16.	Exception Handling: The Exception Hierarchy 3

Exception Handling User-Defined Exception Classes : Exception Class « Language Basics « C# / C Sharp

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