using System;
using System.IO;
using System.Linq;
 
namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
 
            //★したいこと
            //ディレクトリAとディレクトリBを比較し、ディレクトリAにのみに存在するファイル
            //および更新されたファイルの一覧を作成したい。
            //ただし、各々の検索ディレクトリに対して相対的に同階層で同名、同サイズなら同一ファイルとみなす。
 
            //★前提条件
            //c:\test\dira\doc1.txt(3byte)
            //c:\test\dira\doc2.txt(3byte)
            //c:\test\dira\doc3.txt(3byte)
            //c:\test\dirb\doc1.txt(3byte)
            //c:\test\dirb\doc2.txt(3byte)
            //c:\test\dirb\sub\doc3.txt(3byte)
 
            //★期待する結果
            //c:\test\dira\doc3.txt
 
            string basePath1 = @"c:\test\dirA";
            string basePath2 = @"c:\test\dirB";
 
            DirectoryInfo d1 = new DirectoryInfo(basePath1);
            DirectoryInfo d2 = new DirectoryInfo(basePath2);
 
            var files1 = from file1 in d1.EnumerateFiles("*", SearchOption.AllDirectories)
                         select new KurabetaiFile(d1, file1);
 
            var files2 = from file2 in d2.EnumerateFiles("*", SearchOption.AllDirectories)
                         select new KurabetaiFile(d2, file2);
 
            var queryList1Only = files1.Except(files2);
            foreach (var file in queryList1Only)
            {
                Console.WriteLine(String.Format("DirAにのみ存在:{0}", file.FullName));
            }
        }
    }
 
    public class KurabetaiFile
    {
 
        private FileInfo f;
        private int hc;
 
        public string FullName { get { return f.FullName; } }
 
        public KurabetaiFile(DirectoryInfo dir, FileInfo file)
        {
            f = file;
            hc = file.FullName.Substring(dir.FullName.Length).GetHashCode();
        }
 
        public override int GetHashCode()
        {
            return hc;
        }
 
        public override bool Equals(object obj)
        {
            var _obj = obj as KurabetaiFile;
            return (_obj == null) ? false : (f.Length == _obj.f.Length);
        }
    }
}
 

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