Using #warning and #error - CSharp Language Basics

CSharp examples for Language Basics:Preprocessor

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Description

Using #warning and #error

Demo Code

#define DEBUG//from  ww w . ja v a2s .  c om
#define BOOKCHECK
#if DEBUG
#warning Compiled listing in Debug Mode
#endif
#if BOOKCHECK
#warning Compiled listing with Book Check on
#endif
#if DEBUG && PRODUCTION
#error Compiled with both DEBUG and PRODUCTION!
#endif
using System;
using System.IO;
public class Reading2
{
   public static void Main(String[] args)
   {
      if( args.Length < 1 )
      {
         Console.WriteLine("Must include file name.");
      }
      else
      {
         #if DEBUG
         for ( int x = 0; x < args.Length ; x++ )
         {
            Console.WriteLine("Arg[{0}] = {1}", x, args[x]);
         }
         #endif
         string buffer;
         StreamReader myFile = File.OpenText(args[0]);
         while ( (buffer = myFile.ReadLine()) != null )
         {
            #if BOOKCHECK
            if (buffer.Length > 72)
            {
               Console.WriteLine("*** Following line too wide to present in book ");
            }
            Console.Write( "{0:D3} - ", buffer.Length);
            #endif
            Console.WriteLine(buffer);
         }
         myFile.Close();
      }
   }
}

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