/*
C# Programming Tips & Techniques
by Charles Wright, Kris Jamsa

Publisher: Osborne/McGraw-Hill (December 28, 2001)
ISBN: 0072193794
*/

// EnvTrace.cs -- demonstrates printing the stack trace from the Environment
//                when an exception is not thrown.
//
//                Compile this program with the following command line:
//                    C:>csc /debug:full EnvTrace.cs
using System;
using System.Diagnostics;

namespace nsExceptions
{
    public class EnvTrace
    {
        static public void Main ()
        {
            clsTest test = new clsTest();
            test.TestStackTrace ();
            Console.WriteLine ("
Program completed normally");
        }
    }
    public class clsTest
    {
        public void TestStackTrace ()
        {
            try
            {
                CauseTrouble(1.7);
            }
            catch (Exception e)
            {
                Console.WriteLine (e.StackTrace);
            }
        }
        void CauseTrouble (double val)
        {
            clsAnother nudder = new clsAnother ();
            nudder.MakeProblem ((int) val);
        }
    }
    class clsAnother
    {
        public void MakeProblem (int x)
        {
           Console.WriteLine (Environment.StackTrace); 
        }
    }
}

           
         
     

   

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

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

// 04 - Exception HandlingFinally
// copyright 2000 Eric Gunnerson
using System;
using System.IO;

public class ExceptionHandlingFinally
{
    public static void Main()
    {
        Processor processor = new Processor();
        try
        {
            processor.ProcessFile();
        }
        catch (Exception e)
        {
            Console.WriteLine("Exception: {0}", e);
        }
    }
}

class Processor
{
    int    count;
    int    sum;
    public int average;
    void CalculateAverage(int countAdd, int sumAdd)
    {
        count += countAdd;
        sum += sumAdd;
        average = sum / count;
    }    
    public void ProcessFile()
    {
        FileStream f = new FileStream("data.txt", FileMode.Open);
        try
        {
            StreamReader t = new StreamReader(f);
            string    line;
            while ((line = t.ReadLine()) != null)
            {
                int count;
                int sum;
                count = Convert.ToInt32(line);
                line = t.ReadLine();
                sum = Convert.ToInt32(line);
                CalculateAverage(count, sum);
            }
        }
        // always executed before function exit, even if an
        // exception was thrown in the try.
        finally
        {
            f.Close();
        }
    }
}

           
          

/*
C#: The Complete Reference
by Herbert Schildt

Publisher: Osborne/McGraw-Hill (March 8, 2002)
ISBN: 0072134852
*/

// Use finally.

using System;

class UseFinally {
public static void genException(int what) {
int t;
int[] nums = new int[2];

Console.WriteLine(“Receiving ” + what);
try {
switch(what) {
case 0:
t = 10 / what; // generate div-by-zero error
break;
case 1:
nums[4] = 4; // generate array index error.
break;
case 2:
return; // return from try block
}
}
catch (DivideByZeroException) {
// catch the exception
Console.WriteLine(“Can't divide by Zero!”);
return; // return from catch
}
catch (IndexOutOfRangeException) {
// catch the exception
Console.WriteLine(“No matching element found.”);
}
finally {
Console.WriteLine(“Leaving try.”);
}
}
}

public class FinallyDemo {
public static void Main() {

for(int i=0; i < 3; i++) { UseFinally.genException(i); Console.WriteLine(); } } } [/csharp]

   

/*
Learning C# 
by Jesse Liberty

Publisher: O'Reilly 
ISBN: 0596003765
*/

 using System;

 namespace ExceptionHandling
 {
    public class TesterExceptionHandling6
    {
       public void Run()
       {
           try
           {
               Console.WriteLine("Open file here");
               double a = 12;
               double b = 0;
               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(
                   "
DivideByZeroException! Msg: {0}",
                   e.Message);
               Console.WriteLine(
                   "
HelpLink: {0}", e.HelpLink);
               Console.WriteLine(
                   "
Here's a stack trace: {0}
",
                   e.StackTrace);
           }
           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)
                throw new ArithmeticException();
            return a/b;
        }

        static void Main()
        {
            Console.WriteLine("Enter Main...");
            TesterExceptionHandling6 t = new TesterExceptionHandling6();
            t.Run();
            Console.WriteLine("Exit Main...");
        }
    }
 }
           
          

   

/*
Learning C# 
by Jesse Liberty

Publisher: O'Reilly 
ISBN: 0596003765
*/

 using System;

 namespace ExceptionHandling
 {
    public class TesterExceptionHandling5
    {
       public void Run()
       {
           try
           {
               Console.WriteLine("Open file here");
               double a = 5;
               double b = 0;
               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)
           {
               Console.WriteLine(
                   "DivideByZeroException caught!");
           }
           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)
                throw new System.DivideByZeroException();
            if (a == 0)
                throw new System.ArithmeticException();
            return a/b;
        }

        static void Main()
        {
            Console.WriteLine("Enter Main...");
            TesterExceptionHandling5 t = new TesterExceptionHandling5();
            t.Run();
            Console.WriteLine("Exit Main...");
        }
    }
 }

           
          

   

/*
C# Programming Tips & Techniques
by Charles Wright, Kris Jamsa

Publisher: Osborne/McGraw-Hill (December 28, 2001)
ISBN: 0072193794
*/

// Finally.cs -- Demonstates the possible uses of a finally block
//
//               Compile this program with the following command line:
//                   C:>csc Finally.cs
//
namespace nsFinally
{
    using System;
    public class Finally
    {
        static public void Main ()
        {
            try
            {
                NoProblem ();
            }
// No exception possible here. Use finally without a catch
            finally
            {
                Console.WriteLine ("No problem at all
");
            }
            try
            {
                SmallProblem ();
            }
            catch (clsException e)
            {
                Console.WriteLine (e.Message);
            }
            finally
            {
                Console.WriteLine ("But not big enough to exit
");
            }
            try
            {
                BigProblem ();
            }
            catch (DivideByZeroException e)
            {
                Console.WriteLine (e.Message);
            }
            finally
            {
                Console.WriteLine ("But the finally block still executes.");
            }
        }
        static public void NoProblem()
        {
        }
        static public void SmallProblem ()
        {
            clsException ex = new clsException();
            ex.Message = "Small problem encountered";
            throw (ex);
        }
        static public void BigProblem ()
        {
            clsException ex = new clsException();
            ex.Message = "Big trouble. Applicaion must end.";
            throw (ex);
        }
    }
// Define a custom exception class just for a personalized message
    public class clsException : Exception
    {
        new public string Message = null;
    }
}

           
          

   

/*
Mastering Visual C# .NET
by Jason Price, Mike Gunderloy

Publisher: Sybex;
ISBN: 0782129110
*/
/*
  Example13_1.cs illustrates a try, catch, and finally block
*/

using System;

public class Example13_1
{

  public static void Main()
  {

    try
    {

      // code that throws an exception
      int zero = 0;
      Console.WriteLine("In try block: attempting division by zero");
      int myInt = 1 / zero;  // throws the exception
      Console.WriteLine("You never see this message!");

    }
    catch
    {

      // code that handles the exception
      Console.WriteLine("In catch block: an exception was thrown");

    }
    finally
    {

      // code that does any cleaning up
      Console.WriteLine("In finally block: do any cleaning up here");

    }

  }

}