ex-11-06

Programming Csharp Source Code(代码) Programming Csharp Source Code

// Example 11-06: Working with an exception object

namespace Programming_CSharp
{
    using System;

    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 = 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(
                     "\nDivideByZeroException! Msg: {0}",
                     e.Message);
                Console.WriteLine(
                     "\nHelpLink: {0}", e.HelpLink);
                Console.WriteLine(
                     "\nHere's a stack trace: {0}\n", 
                     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;
        }
    }
}