Demonstrates using if statements to sort out an IOException

   

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

Publisher: Osborne/McGraw-Hill (December 28, 2001)
ISBN: 0072193794
*/
// IOExcept.cs -- Demonstrates using if statements to sort out an IOException
//
//                Compile this program with the following command line:
//                    C:>csc IOExcept.cs
//
namespace nsExcept
{
    using System;
    using System.IO;
    public class IOExcept
    {
        static public void Main (string [] args)
        {
            if (args.Length == 0)
            {
                Console.WriteLine ("Please enter a file name");
                return;
            }
            ReadFile (args[0]);
        }
        static public void ReadFile (string FileName)
        {
            FileStream strm = null;
            StreamReader reader = null;
            try
            {
                strm = new FileStream (FileName, FileMode.Open,
                                                   FileAccess.Read);
                reader = new StreamReader (strm);
                while (reader.Peek() > 0)
                {
                    string str = reader.ReadLine();
                    Console.WriteLine (str);
                }
            }
            catch (IOException e)
            {
                if (e is EndOfStreamException)
                {
                    Console.WriteLine ("Attempted to read beyond end of file");
                }
                else if (e is FileNotFoundException)
                {
                    Console.WriteLine ("The file name " + FileName +
                                       " cannot be found");
                    return;
                }
                else if (e is DirectoryNotFoundException)
                {
                    Console.WriteLine ("The path for name " + FileName +
                                       " cannot be found");
                    return;
                }
                else if (e is FileLoadException)
                {
                    Console.WriteLine ("Cannot read from " + FileName);
                }
                reader.Close();
                strm.Close ();
            }
            catch (Exception e)
            {
                Console.WriteLine (e.Message);
            }
        }
    }
}