When a method calls itself

This you can't do in RPG - have a method call itself. Sounds like something you would never use? Think again.

See this small console program that recurses through directories to get a list of folders and files. When the method finds a directory, it calls itself with the sub folder as a parameter whereupon the File part of the IF statement is executed.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;


namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            Recurse(@"c:\temp");
        }
       
               public static void Recurse(string directory)
    {
        DirectoryInfo path = new DirectoryInfo(directory);
        FileSystemInfo[] files = path.GetFileSystemInfos( );
        foreach (FileSystemInfo file in files)
        {
            if (file is DirectoryInfo)
            { 
                Console.WriteLine("Folder-> " + ((DirectoryInfo)file).FullName);

// Now the method calls itself passing in the subfolder name. When the method is called
all the files in the subfolder are listed 
                Recurse(((DirectoryInfo)file).FullName);
            }
            if (file is FileInfo)
            {
                Console.WriteLine("File-> " + ((FileInfo)file).FullName); 
            } 
            
        }
    


        }

    }
}

LiveJournal Tags: recursion,i/o,filesystem,directory,folders