Demonstrates stacking catch blocks to provide alternate code for more than one exception type

   

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

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

// Except.cs -- Demonstrates stacking catch blocks to provide alternate code for
// more than one exception type.
//
// Compile this program with the following command line:
//    C:>csc Except.cs
//
namespace nsExcept
{
    using System;
    using System.IO;
    
    public class Except
    {
        static public void Main (string [] args)
        {
            if (args.Length == 0)
            {
                Console.WriteLine ("Please enter a file name");
                return;
            }
            try
            {
                ReadFile (args[0]);
            }
            catch (ArgumentException)
            {
                Console.WriteLine ("The file name " + args [0] +
                          " is empty or contains an invalid character");
            }
            catch (FileNotFoundException)
            {
                Console.WriteLine ("The file name " + args [0] +
                                   " cannot be found");
            }
            catch (DirectoryNotFoundException)
            {
                Console.WriteLine ("The path for " + args [0] +
                                   " is invalid");
            }
            catch (Exception e)
            {
                Console.WriteLine (e);
            }
        }
        static public void ReadFile (string FileName)
        {
            FileStream strm = new FileStream (FileName, FileMode.Open,
                                                        FileAccess.Read);
            StreamReader reader = new StreamReader (strm);
            string str = reader.ReadToEnd ();
            Console.WriteLine (str);
        }
    }
}